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path: root/drivers/pwm/pwm-sti.c
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2022-05-20pwm: sti: Implement .apply() callbackUwe Kleine-König1-3/+26
To eventually get rid of all legacy drivers convert this driver to the modern world implementing .apply(). This just pushed a variant of pwm_apply_legacy() into the driver that was slightly simplified because the driver doesn't provide a .set_polarity() callback. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2021-04-09pwm: sti: Free resources only after pwmchip_remove()Uwe Kleine-König1-1/+2
Before pwmchip_remove() returns the PWM is expected to be functional. So remove the pwmchip before disabling the clocks. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2021-04-09pwm: sti: Don't modify HW state in .remove callbackUwe Kleine-König1-3/+0
A consumer is expected to disable a PWM before calling pwm_put(). And if they didn't there is hopefully a good reason (or the consumer needs fixing). Also if disabling an enabled PWM was the right thing to do, this should better be done in the framework instead of in each low level driver. So drop the hardware modification from the .remove() callback. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2021-03-22pwm: Always allocate PWM chip base ID dynamicallyUwe Kleine-König1-1/+0
Since commit 5e5da1e9fbee ("pwm: ab8500: Explicitly allocate pwm chip base dynamically") all drivers use dynamic ID allocation explicitly. New drivers are supposed to do the same, so remove support for driver specified base IDs and drop all assignments in the low-level drivers. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2020-12-17pwm: sti: Remove unnecessary blank lineThierry Reding1-1/+0
A single blank line is enough to separate logical code blocks. Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2020-12-17pwm: sti: Avoid conditional gotosThierry Reding1-26/+22
Using gotos for conditional code complicates this code significantly. Convert the code to simple conditional blocks to increase readability. Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2020-12-17pwm: sti: Convert to devm_platform_ioremap_resource()Yangtao Li1-4/+1
Use devm_platform_ioremap_resource() to simplify code. Signed-off-by: Yangtao Li <tiny.windzz@gmail.com> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2019-09-21pwm: Remove dev_err() usage after platform_get_irq()Stephen Boyd1-3/+1
We don't need dev_err() messages when platform_get_irq() fails now that platform_get_irq() prints an error message itself when something goes wrong. Let's remove these prints with a simple semantic patch. // <smpl> @@ expression ret; struct platform_device *E; @@ ret = ( platform_get_irq(E, ...) | platform_get_irq_byname(E, ...) ); if ( \( ret < 0 \| ret <= 0 \) ) { ( -if (ret != -EPROBE_DEFER) -{ ... -dev_err(...); -... } | ... -dev_err(...); ) ... } // </smpl> While we're here, remove braces on if statements that only have one statement (manually). Cc: Thierry Reding <thierry.reding@gmail.com> Cc: linux-pwm@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152Thomas Gleixner1-5/+1
Based on 1 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 as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-01-04pwm: Remove .can_sleep from struct pwm_chipThierry Reding1-1/+0
All PWM devices have been marked as "might sleep" since v4.5, there is no longer a need to differentiate on a per-chip basis. Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08pwm: sti: Take the opportunity to conduct a little house keepingLee Jones1-72/+81
This includes fixing some Coding Style issues and re-ordering and/or simplifying a little code. Signed-off-by: Lee Jones <lee.jones@linaro.org> [thierry.reding@gmail.com: applied some bikeshedding> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08pwm: sti: It's now valid for number of PWM channels to be zeroLee Jones1-1/+14
Setting up the STI PWM IP as capture only, with zero PWM output devices is a perfectly valid configuration. It is no longer okay to assume that there must be at least 1 PWM output device. In this patch we make the default number of PWM output devices zero and only configure channels explicitly requested. Reported-by: Peter Griffin <peter.griffin@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08pwm: sti: Add PWM capture callbackLee Jones1-0/+88
Once a PWM capture has been initiated, the capture call enables a rising edge detection interrupt, then waits. Once each of the 3 phase changes have been recorded the thread then wakes. The remaining part of the call carries out the relevant calculations and returns a structure filled out with the capture data. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08pwm: sti: Add support for PWM capture interruptsLee Jones1-1/+91
Here we're requesting the PWM capture IRQ and supplying the handler that will be called in the event of an interrupt to handle it. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08pwm: sti: Initialise PWM capture device dataLee Jones1-7/+38
Each PWM capture device is allocated a structure to hold its own state. During a capture the device may be partaking in one of 3 phases. Initial (rising) phase change, a subsequent (falling) phase change indicating end of the duty-cycle phase and finally a final (rising) phase change indicating the end of the period. The timer value snapshot each event is held in a variable of the same name, and the phase number (0, 1, 2) is contained in the index variable. Other device specific information, such as GPIO pin, the IRQ wait queue and locking is also contained in the structure. This patch initialises this structure for each of the available devices. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08pwm: sti: Supply PWM Capture clock handlingLee Jones1-0/+25
ST's PWM IP is supplied by 2 different clocks. One for PWM output and the other for capture. This patch provides clock handling for the latter. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08pwm: sti: Supply PWM capture register addresses and bit locationsLee Jones1-0/+25
This is in preparation for subsequent patches that add support for PWM capture to this driver. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08pwm: sti: Only request clock rate when neededLee Jones1-8/+8
In the original code the clock rate was only obtained during initialisation; however, the rate may change between then and its use. This patch ensures the correct rate is acquired just before use. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08pwm: sti: Reorganise register names in preparation for new functionalityLee Jones1-35/+41
Exciting functionality is on the way to this device. But before we can add it, we need to do some basic housekeeping so the additions can be added cleanly. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08pwm: sti: Rename channel => deviceLee Jones1-16/+16
This is to bring the terminology used in the STi PWM driver more into line with the PWM subsystem. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-01-30pwm: sti: Maintain a bitmap of configured devicesAjit Pal Singh1-19/+11
This patch introduces a bitmap which is used to keep track of the pwm channels which have been configured in a pwm chip. The method used earlier to find the number of configured channels, was to count the pwmdevices with PWMF_REQUESTED field set and period value configured. This was not correct and failed when of_pwm_get()/pwm_get() and then pwm_config() was used. Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-08pwm: sti: Remove PWM period tableAjit Pal Singh1-48/+16
Removes the PWM period table. Instead the prescaler is computed from the period value passed in the config() function. Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-08pwm: sti: Sync between enable/disable callsAjit Pal Singh1-14/+30
ST PWM IP has a common enable/disable control for all the PWM channels on a PWM cell. Disables PWM output on the PWM HW only when disable is called for the last channel. Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-08pwm: sti: Ensure same period values for all channelsAjit Pal Singh1-44/+96
ST PWM IP shares the same clock prescaler across all the PWM channels. Hence configuration requests which change the period will affect all the channels. Do not allow period changes which will stomp period settings of the already configured channels. Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-08pwm: sti: Fix PWM prescaler handlingAjit Pal Singh1-11/+27
This patch fixes the pwm driver to write the complete 8 bits of the prescaler value to the PWM Control register. Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-07pwm: sti: Add new driver for ST's PWM IPLee Jones1-0/+366
This driver supports all current STi platforms' PWM IPs. Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> [thierry.reding: rename module to pwm-sti, fix build breakage] Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
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