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path: root/drivers/gpio/gpio-dwapb.c
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2022-06-10gpio: dwapb: Don't print error on -EPROBE_DEFERSerge Semin1-4/+3
Currently if the APB or Debounce clocks aren't yet ready to be requested the DW GPIO driver will correctly handle that by deferring the probe procedure, but the error is still printed to the system log. It needlessly pollutes the log since there was no real error but a request to postpone the clock request procedure since the clocks subsystem hasn't been fully initialized yet. Let's fix that by using the dev_err_probe method to print the APB/clock request error status. It will correctly handle the deferred probe situation and print the error if it actually happens. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2022-05-24gpio: dwapb: Make the irqchip immutableGeert Uytterhoeven1-14/+24
Commit 6c846d026d49 ("gpio: Don't fiddle with irqchips marked as immutable") added a warning to indicate if the gpiolib is altering the internals of irqchips. Following this change the following warning is now observed for the dwapb driver: gpio gpiochip0: (50200000.gpio): not an immutable chip, please consider fixing it! Fix this by making the irqchip in the dwapb driver immutable. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2022-04-25gpio: use raw spinlock for gpio chip shadowed dataSchspa Shi1-18/+18
In case of PREEMPT_RT, there is a raw_spinlock -> spinlock dependency as the lockdep report shows. __irq_set_handler irq_get_desc_buslock __irq_get_desc_lock raw_spin_lock_irqsave(&desc->lock, *flags); // raw spinlock get here __irq_do_set_handler mask_ack_irq dwapb_irq_ack spin_lock_irqsave(&gc->bgpio_lock, flags); // sleep able spinlock irq_put_desc_busunlock Replace with a raw lock to avoid BUGs. This lock is only used to access registers, and It's safe to replace with the raw lock without bad influence. [ 15.090359][ T1] ============================= [ 15.090365][ T1] [ BUG: Invalid wait context ] [ 15.090373][ T1] 5.10.59-rt52-00983-g186a6841c682-dirty #3 Not tainted [ 15.090386][ T1] ----------------------------- [ 15.090392][ T1] swapper/0/1 is trying to lock: [ 15.090402][ T1] 70ff00018507c188 (&gc->bgpio_lock){....}-{3:3}, at: _raw_spin_lock_irqsave+0x1c/0x28 [ 15.090470][ T1] other info that might help us debug this: [ 15.090477][ T1] context-{5:5} [ 15.090485][ T1] 3 locks held by swapper/0/1: [ 15.090497][ T1] #0: c2ff0001816de1a0 (&dev->mutex){....}-{4:4}, at: __device_driver_lock+0x98/0x104 [ 15.090553][ T1] #1: ffff90001485b4b8 (irq_domain_mutex){+.+.}-{4:4}, at: irq_domain_associate+0xbc/0x6d4 [ 15.090606][ T1] #2: 4bff000185d7a8e0 (lock_class){....}-{2:2}, at: _raw_spin_lock_irqsave+0x1c/0x28 [ 15.090654][ T1] stack backtrace: [ 15.090661][ T1] CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.10.59-rt52-00983-g186a6841c682-dirty #3 [ 15.090682][ T1] Hardware name: Horizon Robotics Journey 5 DVB (DT) [ 15.090692][ T1] Call trace: ...... [ 15.090811][ T1] _raw_spin_lock_irqsave+0x1c/0x28 [ 15.090828][ T1] dwapb_irq_ack+0xb4/0x300 [ 15.090846][ T1] __irq_do_set_handler+0x494/0xb2c [ 15.090864][ T1] __irq_set_handler+0x74/0x114 [ 15.090881][ T1] irq_set_chip_and_handler_name+0x44/0x58 [ 15.090900][ T1] gpiochip_irq_map+0x210/0x644 Signed-off-by: Schspa Shi <schspa@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Doug Berger <opendmb@gmail.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2022-01-03gpio: dwapb: Switch to use fwnode instead of of_nodeAndy Shevchenko1-4/+1
GPIO library now accepts fwnode as a firmware node, so switch the driver to use it and hence rectify the ACPI case which uses software nodes. Note, in this case it's rather logical fix that doesn't affect functionality, thus no backporting required. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
2021-12-01gpio: dwapb: clarify usage of the register file versionAndy Shevchenko1-4/+6
First of all, it's obvious that different versions can't be provided simultaneously. Hence, versions can't be bit masks. Second, due to above we have to mask out the version field in the flags and only that can be evaluated against the certain version. Clarify all above by: - introducing GPIO_REG_OFFSET_V1 and GPIO_REG_OFFSET_MASK - replacing conditional to mask out bits and compare to a version Luckily there is no functional change, so no need to backport this. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Bartosz Golaszewski <brgl@bgdev.pl>
2021-08-11gpio: dwapb: Get rid of legacy platform dataAndy Shevchenko1-10/+18
Platform data is a legacy interface to supply device properties to the driver. In this case we don't have anymore in-kernel users for it. Just remove it for good. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Tested-by: Serge Semin <fancer.lancer@gmail.com>
2021-08-11gpio: dwapb: Read GPIO base from gpio-base propertyAndy Shevchenko1-0/+4
For backward compatibility with some legacy devices introduce a new (*) property gpio-base to read GPIO base. This will allow further cleaning up of the driver. *) Note, it's not new for the GPIO library since the mockup driver is using it already. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
2021-08-11gpio: dwapb: Unify ACPI enumeration checks in get_irq() and configure_irqs()Andy Shevchenko1-12/+12
Shared IRQ is only enabled for ACPI enumeration, there is no need to have a special flag for that, since we simple can test if device has been enumerated by ACPI. This unifies the checks in dwapb_get_irq() and dwapb_configure_irqs(). Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Serge Semin <fancer.lancer@gmail.com> Tested-by: Serge Semin <fancer.lancer@gmail.com>
2021-06-07gpio-dwapb: Drop unused headers and sort the restAndy Shevchenko1-5/+3
Drop unused headers and drop the rest. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Serge Semin <fancer.lancer@gmail.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2021-06-02gpio: dwapb: Switch to use fwnode_irq_get()Andy Shevchenko1-8/+4
We have open coded variant of fwnode_irq_get() in dwapb_get_irq(). Replace it with a simple call. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2021-06-02gpio: dwapb: Drop redundant check in dwapb_irq_set_type()Andy Shevchenko1-3/+0
For more than 15 years we may not get into ->irq_set_type() without any meaningful type provided. Drop redundant check in dwapb_irq_set_type(). See the commit e76de9f8eb67 ("[PATCH] genirq: add SA_TRIGGER support") out of curiosity. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2020-12-17Merge tag 'gpio-v5.11-1' of ↵Linus Torvalds1-4/+3
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull GPIO updates from Linus Walleij: "This is the bulk of the GPIO changes for the v5.11 kernel cycle: Core changes: - Retired the old set-up function for GPIO IRQ chips. All chips now use the template struct gpio_irq_chip and pass that to the core to be set up alongside the gpio_chip. We can finally get rid of the old cruft. - Some refactoring and clean up of the core code. - Support edge event timestamps to be stamped using REALTIME (wall clock) timestamps. We have found solid use cases for this, so we support it. New drivers: - MStar MSC313 GPIO driver. - HiSilicon GPIO driver. Driver improvements: - The PCA953x driver now also supports the NXP PCAL9554B/C chips. - The mockup driver can now be probed from the device tree which is pretty useful for virtual prototyping of devices. - The Rcar driver now supports .get_multiple() - The MXC driver dropped some legacy and became a pure device tree client. - The Exar driver was moved over to the IDA interface for enumerating, and also switched over to using regmap for register access" * tag 'gpio-v5.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (87 commits) MAINTAINERS: Remove reference to non-existing file gpio: hisi: Do not require ACPI for COMPILE_TEST MAINTAINERS: Add maintainer for HiSilicon GPIO driver gpio: gpio-hisi: Add HiSilicon GPIO support gpio: cs5535: Simplify the return expression of cs5535_gpio_probe() gpiolib: irq hooks: fix recursion in gpiochip_irq_unmask dt-bindings: mt7621-gpio: convert bindings to YAML format gpiolib: cdev: Flag invalid GPIOs as used gpio: put virtual gpio device into their own submenu drivers: gpio: amd8111: use SPDX-License-Identifier drivers: gpio: amd8111: prefer dev_err()/dev_info() over raw printk drivers: gpio: bt8xx: prefer dev_err()/dev_warn() over of raw printk gpio: Add TODO item for debugfs interface gpio: just plain warning when nonexisting gpio requested tools: gpio: add option to report wall-clock time to gpio-event-mon tools: gpio: add support for reporting realtime event clock to lsgpio gpiolib: cdev: allow edge event timestamps to be configured as REALTIME gpio: msc313: MStar MSC313 GPIO driver dt-bindings: gpio: Binding for MStar MSC313 GPIO controller dt-bindings: gpio: Add a binding header for the MSC313 GPIO driver ...
2020-12-09Merge tag 'gpio-updates-for-v5.11' of ↵Linus Walleij1-4/+3
git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into devel gpio updates for v5.11-rc1 - several refactoring patches of the core gpiolib code - add support for NXP PCAL9554B/C to gpio-pca953x - allow probing mockup devices from device tree - refactoring and improvements to gpio-rcar - improvements to locking in gpio-tegra - code shrink in gpiolib devres - get the irq offset from device tree in gpio-sifive - major refactoring of gpio-exar - convert gpio-mvebu pwm access to regmap - create a new submenu for virtual GPIO drivers - fix clang fall-through warnings treewide - minor driver refactoring and tweaks sprinkled all over
2020-12-02gpio: dwapb: fix NULL pointer dereference at dwapb_gpio_suspend()Luo Jiaxing1-0/+2
Following Calltrace is found when running echo freeze > /sys/power/state. [ 272.755506] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 [ 272.755585] Call trace: [ 272.755587] dwapb_gpio_suspend+0x18/0x318 [ 272.755588] pm_generic_suspend+0x2c/0x48 [ 272.755595] acpi_subsys_suspend+0x60/0x70 [ 272.755599] dpm_run_callback.isra.18+0x40/0xe0 [ 272.755601] __device_suspend+0xf4/0x360 The reason is platform_set_drvdata() is deleted, and dwapb_gpio_suspend() get *gpio by dev_get_drvdata(). Fixes: feeaefd378ca ("gpio: dwapb: Use resource managed GPIO-chip add data method") Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2020-11-30gpio: dwapb: Remove unnecessary error messageDamien Le Moal1-4/+3
In dwapb_get_reset(), if devm_reset_control_get_optional_shared() fails, an error message is printed even if the failure is the benign EPROBE_DEFER error due to the reset controller not yet being initialized. Use dev_err_probe() to handle devm_reset_control_get_optional_shared() errors to avoid unnecessarilly printing an error message for the deferred probe error. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2020-10-26gpio: dwapb: Fix missing conversion to GPIO-lib-based IRQ-chipJia He1-2/+2
Commit 0ea683931adb ("gpio: dwapb: Convert driver to using the GPIO-lib-based IRQ-chip") missed the case in dwapb_irq_set_wake(). Without this fix, probing the dwapb gpio driver will hit a error: "address between user and kernel address ranges" on a Ampere armv8a server and cause a panic. Fixes: 0ea683931adb ("gpio: dwapb: Convert driver to using the GPIO-lib-based IRQ-chip") Signed-off-by: Jia He <justin.he@arm.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2020-08-27gpio: dwapb: Use resource managed GPIO-chip add data methodSerge Semin1-35/+2
Since the resource managed version of gpiochip_add_data() will handle the GPIO-chip data automated cleanup we can freely remove the DW APB GPIO driver code responsible for that. After doing so the DW APB GPIO driver removal callback can be also fully discarded since there is nothing left to be done for it. All the cleanups are now performed by means of the device managed framework. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200730152808.2955-11-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-08-27gpio: dwapb: Get clocks by means of resource managed interfaceSerge Semin1-16/+32
The kernel clock framework provides the resource managed version of the clk_bulk_get() method. The only thing which needs to be also automated is the clocks disable/unprepare procedure executed on the device removal. It can be implemented by means of the custom action definition. After that the clocks acquisition and release will be purely managed by the device resources interface. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200730152808.2955-10-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-08-27gpio: dwapb: Get reset control by means of resource managed interfaceSerge Semin1-6/+29
The reset control interface provides the resource managed version of the reset_control_get() method. The only thing which needs to be also automated is the reset lane assertion on the device removal. It can be implemented by means of the custom action definition. After that the reset control will be purely managed by the device resources interface. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200730152808.2955-9-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-08-27gpio: dwapb: Discard ACPI GPIO-chip IRQs requestSerge Semin1-4/+0
Since GPIOlib-based IRQ-chip interface is now utilized there is no need in calling the methods acpi_gpiochip_{request,free}_interrupts() here. They will be called from gpiochip_add_irqchip()/gpiochip_irqchip_remove() anyway. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200730152808.2955-8-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-08-27gpio: dwapb: Discard GPIO-to-IRQ mapping functionSerge Semin1-10/+0
Since GPIOlib-based IRQ-chip interface is now utilized there is no need in setting up a custom GPIO-to-IRQ mapping method. GPIO-lib defines the standard mapping method - gpiochip_to_irq(), which will be used anyway no matter whether the custom to_irq callback is specified or not. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200730152808.2955-7-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-08-27gpio: dwapb: Convert driver to using the GPIO-lib-based IRQ-chipSerge Semin1-93/+110
GPIO-lib provides a ready-to-use interface to initialize an IRQ-chip on top of a GPIO chip. It's better from maintainability and readability point of view to use one instead of supporting a hand-written Generic IRQ-chip-based implementation. Moreover the new implementation won't cause much functional overhead but will provide a cleaner driver code. All of that makes the DW APB GPIO driver conversion pretty much justified especially seeing a tendency of the other GPIO drivers getting converted too. Here is what we do in the framework of this commit to convert the driver to using the GPIO-lib-based IRQ-chip interface: 1) IRQ ack, mask and unmask callbacks are locally defined instead of using the Generic IRQ-chip ones. 2) An irq_chip structure instance is embedded into the dwapb_gpio private data. Note we can't have a static instance of that structure since GPIO-lib will add some hooks into it by calling gpiochip_set_irq_hooks(). A warning about that would have been printed by the GPIO-lib code if we used a single irq_chip structure instance for multiple DW APB GPIO controllers. 3) Initialize the gpio_irq_chip structure embedded into the gpio_chip descriptor. By default there is no IRQ enabled so any event raised will be handled by the handle_bad_irq() IRQ flow handler. If DW APB GPIO IP-core is synthesized to have non-shared reference IRQ-lines, then as before the hierarchical and cascaded cases are distinguished by checking how many parental IRQs are defined. (Note irq_set_chained_handler_and_data() won't initialize IRQs, which descriptors couldn't be found.) If DW APB GPIO IP is used on a platform with shared IRQ line, then we simply won't let the GPIO-lib to initialize the parental IRQs, but will handle them locally in the driver. 4) Discard linear IRQ-domain and Generic IRQ-chip initialization, since GPIO-lib IRQ-chip interface will create a new domain and accept a standard IRQ-chip structure pointer based on the setting we provided in the gpio_irq_chip structure. 5) Manually select a proper IRQ flow handler directly in the irq_set_type() callback by calling irq_set_handler_locked() method, since an ordinary (not Generic) irq_chip descriptor is now utilized. Note this shalln't give any regression 6) Alter CONFIG_GPIO_DWAPB kernel config to select CONFIG_GPIOLIB_IRQCHIP instead of CONFIG_GENERIC_IRQ_CHIP. Note neither 4) nor 5) shall cause a regression of commit 6a2f4b7dadd5 ("gpio: dwapb: use a second irq chip"), since the later isn't properly used here anyway. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200730152808.2955-6-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-08-27gpio: dwapb: Add max GPIOs macroSerge Semin1-4/+4
Add a new macro DWAPB_MAX_GPIOS which defines the maximum possible number of GPIO lines corresponding to the maximum DW APB GPIO controller port width. Use the new macro instead of number literal 32 where it's applicable. Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200730152808.2955-5-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-08-27gpio: dwapb: Move MFD-specific IRQ handlerSerge Semin1-5/+5
For better readability let's group all the IRQ handlers in a single place of the driver instead of having them scatter around all over the file. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200730152808.2955-4-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-08-27gpio: dwapb: Add ngpios DT-property supportSerge Semin1-1/+2
Indeed generic GPIO DT-schema implies that number of GPIOs should be described by the "ngpios" property located under a GPIO-provider DT node. In that case it's redundant to have a vendor-specific "snps,nr-gpios" property describing the same setting. Moreover it might be errors prone. Since commit 93d2e4322aa7 ("of: platform: Batch fwnode parsing when adding all top level devices") the fwnode parsing is resumed after the vast majority of the platform devices are added. Implicitly that commit activates re-parsing of the whole device tree GPIOs-phandle properties detected having "-gpio/-gpios" suffixes. Since the vendor-specific number of GPIOs property is defined with "-gpios" suffix, then of_link_property() will consider it as a suffix-property with "#gpio-cells" structure, which obviously it doesn't have. As a result for two DW APB GPIO controllers we'll have the next errors printed. OF: /bus@1f059000/gpio@1f044000/gpio-port@0: could not find phandle OF: /bus@1f059000/gpio@1f045000/gpio-port@0: could not get #gpio-cells for /opp-table OF: /bus@1f059000/gpio@1f044000/gpio-port@0: could not find phandle OF: /bus@1f059000/gpio@1f045000/gpio-port@0: could not get #gpio-cells for /opp-table See, the kernel fwnode parsing procedure even tried to resolve the phandle ID, which it thought was the opp-table DT-node, while in fact it was just a number "32". What would happen if that magic number actually referred to a GPIO DT-node with "#gpio-cells" property defined?.. In order to fix the problem let's mark the "snps,nr-gpios" property as deprecated and add the generic "ngpios" property support with the same purpose as the deprecated one. That and the errors log above shall motivate the platform developer to convert the DW APB GPIO DT-nodes to using the standard number of GPIOs property. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200730152808.2955-3-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-05-25gpio: dwapb: Remove unneeded has_irq member in struct dwapb_port_propertyAndy Shevchenko1-7/+7
has_irq member of struct dwapb_port_property is used only in one place, so, make it local test instead and remove from the structure. This local test is using memchr_inv() which is quite efficient in comparison to the original loop and possible little overhead can be neglected. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200519131233.59032-4-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-05-25gpio: dwapb: Don't use IRQ 0 as valid Linux interruptAndy Shevchenko1-7/+7
IRQ 0 is not valid in Linux interrupt number space. Refactor the code with this kept in mind. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200519131233.59032-3-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-05-25gpio: dwapb: avoid error message for optional IRQAndy Shevchenko1-1/+1
platform_get_irq() will generate an error message if the requested IRQ is not present. Use platform_get_irq_optional() to avoid the error message being generated. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200519131233.59032-2-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-05-25gpio: dwapb: Call acpi_gpiochip_free_interrupts() on GPIO chip de-registrationAndy Shevchenko1-9/+16
Add missed acpi_gpiochip_free_interrupts() call when unregistering ports. While at it, drop extra check to call acpi_gpiochip_request_interrupts(). There is no need to have an additional check to call acpi_gpiochip_request_interrupts(). Even without any interrupts available the registered ACPI Event handlers can be useful for debugging purposes. Fixes: e6cb3486f5a1 ("gpio: dwapb: add gpio-signaled acpi event support") Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200519131233.59032-1-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-28gpio: dwapb: Amend indentation in some casesAndy Shevchenko1-8/+6
In some cases indentation makes code harder to read. Amend indentation in those cases despite of lines go a bit over 80 character limit. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Cc: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200422110654.23442-2-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-28gpio: dwapb: Get rid of unnecessary conjunction over 32-bit valueAndy Shevchenko1-2/+1
When we mask interrupts before sleep, there is no need to have a conjunction with 0xffffffff since the accepted by dwapb_write() value is 32-bit. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Serge Semin <fancer.lancer@gmail.com> Cc: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200422110654.23442-1-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Split out dwapb_get_irq() helperAndy Shevchenko1-27/+29
Split out dwapb_get_irq() helper for better readability and maintenance. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-13-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Drop of_match_ptr() & ACPI_PTR() callsAndy Shevchenko1-2/+2
Since we always have a table of IDs compiled in, there is no use for of_match_ptr() nor ACPI_PTR() call. Besides that it brings a warning (depending on configuration): .../gpio-dwapb.c:638:34: warning: ‘dwapb_of_match’ defined but not used [-Wunused-const-variable=] 638 | static const struct of_device_id dwapb_of_match[] = { | ^~~~~~~~~~~~~~ Get rid of them for good. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-12-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Drop bogus BUG_ON()sAndy Shevchenko1-4/+0
There is no case when no context is provided in the ->suspend() and ->resume() hooks. Moreover, BUG_ON() is harmful to user and makes kernel inoperable after the crash. Drop the BUG_ON()s for good. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-11-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Switch to more usual pattern of RMW in dwapb_gpio_set_debounce()Andy Shevchenko1-2/+3
More usual pattern is to prepare value and then write it in a single place. Switch code in dwapb_gpio_set_debounce() to it. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-10-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Convert to use IRQ core provided macrosAndy Shevchenko1-8/+2
IRQ core provides macros such as IRQ_RETVAL(). Convert code to use them. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-9-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Use device_get_match_data() to simplify codeAndy Shevchenko1-12/+1
Use device_get_match_data() here to simplify the code a bit. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-8-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Convert to use irqd_to_hwirq()Andy Shevchenko1-7/+9
Convert to use irqd_to_hwirq() instead of direct access to the hwirq member. Also amend the type of the hwirq holding variable to be irq_hw_number_t. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Cc: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-7-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Deduplicate IRQ resource managementAndy Shevchenko1-27/+0
GPIO library provides default IRQ resource management hooks, there is no need to repeat this in the individual driver. Remove them for good. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-6-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: set default handler to be handle_bad_irq()Andy Shevchenko1-1/+2
We switch the default handler to be handle_bad_irq() instead of handle_level_irq(), though for now apply it later in the code, to make the difference between IRQ chips more visible. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-5-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Use chained IRQ prologue and epilogueAndy Shevchenko1-3/+2
Refactor IRQ handler in order to enter and exit chained IRQ by using respective prologue and epilogue calls. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-4-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Refactor IRQ handler to use bit operationsAndy Shevchenko1-8/+7
Refactor IRQ handler in order to use for_each_set_bit() helper. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-3-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Append MODULE_ALIAS for platform driverAndy Shevchenko1-3/+6
The commit 3d2613c4289f ("GPIO: gpio-dwapb: Enable platform driver binding to MFD driver") introduced a use of the platform driver but missed to add the following line to it: MODULE_ALIAS("platform:gpio-dwapb"); Add this to get driver loaded automatically if platform device is registered. Fixes: 3d2613c4289f ("GPIO: gpio-dwapb: Enable platform driver binding to MFD driver") Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/r/20200415141534.31240-2-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Add debounce reference clock supportSerge Semin1-13/+22
Aside from the APB reference clock DW GPIO controller can have a dedicated clock connected to setup a debounce time interval for GPIO-based IRQs. Since this functionality is optional the corresponding clock source is also optional. Due to this lets handle the debounce clock in the same way as it has been developed for the APB reference clock, but using the bulk request/enable-disable methods. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Paul Burton <paulburton@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200323195401.30338-6-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-04-17gpio: dwapb: Use optional-clocks interface for APB ref-clockSerge Semin1-9/+11
The common clocks kernel framework provides a generic way to use an optional reference clock sources. If it's utilized there is no need in checking whether the clock descriptor pointer is actually a negative error at the moment of the prepare/unprepare clocks method calling. So if the corresponding clock source is provided, then getting an error shall actually terminate the device probe procedure. If it isn't specified then the driver shall proceed with further initializations. We'll use the optional clocks getting method to handle the APB reference clock, which can be provided for instance in the device of-node with "bus" clock-name. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Paul Burton <paulburton@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20200323195401.30338-5-Sergey.Semin@baikalelectronics.ru Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2019-07-31gpiolib: acpi: Split ACPI stuff to gpiolib-acpi.hAndy Shevchenko1-0/+1
This is a follow up to the commit f626d6dfb709 ("gpio: of: Break out OF-only code") which broke down OF parts of GPIO library. Here we do the similar to ACPI. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20190730104337.21235-2-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2019-06-19treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500Thomas Gleixner1-4/+1
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-05drivers: gpio: dwap: use devm_platform_ioremap_resource()Enrico Weigelt, metux IT consult1-3/+1
Use the new helper that wraps the calls to platform_get_resource() and devm_ioremap_resource() together. Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-11-05gpio: gpio-dwapb: simplify getting .driver_dataWolfram Sang1-4/+2
We should get 'driver_data' from 'struct device' directly. Going via platform_device is an unneeded step back and forth. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-08-29gpio: dwapb: Fix error handling in dwapb_gpio_probe()Alexey Khoroshilov1-0/+1
If dwapb_gpio_add_port() fails in dwapb_gpio_probe(), gpio->clk is left undisabled. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-13 13:14:10 +0000