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authorLinus Walleij <linus.walleij@linaro.org>2017-09-10 01:30:46 +0200
committerLinus Walleij <linus.walleij@linaro.org>2017-10-30 08:42:21 +0100
commitb2e63555592f81331c8da3afaa607d8cf83e8138 (patch)
treeb0f1c3c8aab8f2a8d759e63e8f303bfd0821b9d3 /arch/arm/mach-ep93xx
parent2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e (diff)
downloadlinux-b2e63555592f81331c8da3afaa607d8cf83e8138.tar.bz2
i2c: gpio: Convert to use descriptors
This converts the GPIO-based I2C-driver to using GPIO descriptors instead of the old global numberspace-based GPIO interface. We: - Convert the driver to unconditionally grab two GPIOs from the device by index 0 (SDA) and 1 (SCL) which will work fine with device tree and descriptor tables. The existing device trees will continue to work just like before, but without any roundtrip through the global numberspace. - Brutally convert all boardfiles still passing global GPIOs by registering descriptor tables associated with the devices instead so this driver does not need to keep supporting passing any GPIO numbers as platform data. There is no stepwise approach as elegant as this, I strongly prefer this big hammer over any antsteps for this conversion. This way the old GPIO numbers go away and NEVER COME BACK. Special conversion for the different boards utilizing I2C-GPIO: - EP93xx (arch/arm/mach-ep93xx): pretty straight forward as all boards were using the same two GPIO lines, just define these two in a lookup table for "i2c-gpio" and register these along with the device. None of them define any other platform data so just pass NULL as platform data. This platform selects GPIOLIB so all should be smooth. The pins appear on a gpiochip for bank "G" as pins 1 (SDA) and 0 (SCL). - IXP4 (arch/arm/mach-ixp4): descriptor tables have to be registered for each board separately. They all use "IXP4XX_GPIO_CHIP" so it is pretty straight forward. Most board define no other platform data than SCL/SDA so they can drop the #include of <linux/i2c-gpio.h> and assign NULL to platform data. The "goramo_mlr" (Goramo Multilink Router) board is a bit worrisome: it implements its own I2C bit-banging in the board file, and optionally registers an I2C serial port, but claims the same GPIO lines for itself in the board file. This is not going to work: there will be competition for the GPIO lines, so delete the optional extra I2C bus instead, no I2C devices are registered on it anyway, there are just hints that it may contain an EEPROM that may be accessed from userspace. This needs to be fixed up properly by the serial clock using I2C emulation so drop a note in the code. - KS8695 board acs5k (arch/arm/mach-ks8695/board-acs5.c) has some platform data in addition to the pins so it needs to be kept around sans GPIO lines. Its GPIO chip is named "KS8695" and the arch selects GPIOLIB. - PXA boards (arch/arm/mach-pxa/*) use some of the platform data so it needs to be preserved here. The viper board even registers two GPIO I2Cs. The gpiochip is named "gpio-pxa" and the arch selects GPIOLIB. - SA1100 Simpad (arch/arm/mach-sa1100/simpad.c) defines a GPIO I2C bus, and the arch selects GPIOLIB. - Blackfin boards (arch/blackfin/bf533 etc) for these I assume their I2C GPIOs refer to the local gpiochip defined in arch/blackfin/kernel/bfin_gpio.c names "BFIN-GPIO". The arch selects GPIOLIB. The boards get spiked with IF_ENABLED(I2C_GPIO) but that is a side effect of it being like that already (I would just have Kconfig select I2C_GPIO and get rid of them all.) I also delete any platform data set to 0 as it will get that value anyway from static declartions of platform data. - The MIPS selects GPIOLIB and the Alchemy machine is using two local GPIO chips, one of them has a GPIO I2C. We need to adjust the local offset from the global number space here. The ATH79 has a proper GPIO driver in drivers/gpio/gpio-ath79.c and AFAICT the chip is named "ath79-gpio" and the PB44 PCF857x expander spawns from this on GPIO 1 and 0. The latter board only use the platform data to specify pins so it can be cut altogether after this. - The MFD Silicon Motion SM501 is a special case. It dynamically spawns an I2C bus off the MFD using sm501_create_subdev(). We use an approach to dynamically create a machine descriptor table and attach this to the "SM501-LOW" or "SM501-HIGH" gpiochip. We use chip-local offsets to grab the right lines. We can get rid of two local static inline helpers as part of this refactoring. Cc: Steven Miao <realmz6@gmail.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Magnus Damm <magnus.damm@gmail.com> Cc: Ben Dooks <ben.dooks@codethink.co.uk> Cc: Heiko Schocher <hs@denx.de> Acked-by: Wu, Aaron <Aaron.Wu@analog.com> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Ralf Baechle <ralf@linux-mips.org> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'arch/arm/mach-ep93xx')
-rw-r--r--arch/arm/mach-ep93xx/core.c39
-rw-r--r--arch/arm/mach-ep93xx/edb93xx.c15
-rw-r--r--arch/arm/mach-ep93xx/include/mach/platform.h4
-rw-r--r--arch/arm/mach-ep93xx/simone.c12
-rw-r--r--arch/arm/mach-ep93xx/snappercl15.c12
-rw-r--r--arch/arm/mach-ep93xx/vision_ep9307.c7
6 files changed, 27 insertions, 62 deletions
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index f53c61813998..7e99fe829ad1 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -31,7 +31,7 @@
#include <linux/amba/serial.h>
#include <linux/mtd/physmap.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
+#include <linux/gpio/machine.h>
#include <linux/spi/spi.h>
#include <linux/export.h>
#include <linux/irqchip/arm-vic.h>
@@ -320,42 +320,45 @@ void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
/*************************************************************************
* EP93xx i2c peripheral handling
*************************************************************************/
-static struct i2c_gpio_platform_data ep93xx_i2c_data;
+
+/* All EP93xx devices use the same two GPIO pins for I2C bit-banging */
+static struct gpiod_lookup_table ep93xx_i2c_gpiod_table = {
+ .dev_id = "i2c-gpio",
+ .table = {
+ /* Use local offsets on gpiochip/port "G" */
+ GPIO_LOOKUP_IDX("G", 1, NULL, 0, GPIO_ACTIVE_HIGH),
+ GPIO_LOOKUP_IDX("G", 0, NULL, 1, GPIO_ACTIVE_HIGH),
+ },
+};
static struct platform_device ep93xx_i2c_device = {
.name = "i2c-gpio",
.id = 0,
.dev = {
- .platform_data = &ep93xx_i2c_data,
+ .platform_data = NULL,
},
};
/**
* ep93xx_register_i2c - Register the i2c platform device.
- * @data: platform specific i2c-gpio configuration (__initdata)
* @devices: platform specific i2c bus device information (__initdata)
* @num: the number of devices on the i2c bus
*/
-void __init ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
- struct i2c_board_info *devices, int num)
+void __init ep93xx_register_i2c(struct i2c_board_info *devices, int num)
{
/*
- * Set the EEPROM interface pin drive type control.
- * Defines the driver type for the EECLK and EEDAT pins as either
- * open drain, which will require an external pull-up, or a normal
- * CMOS driver.
+ * FIXME: this just sets the two pins as non-opendrain, as no
+ * platforms tries to do that anyway. Flag the applicable lines
+ * as open drain in the GPIO_LOOKUP above and the driver or
+ * gpiolib will handle open drain/open drain emulation as need
+ * be. Right now i2c-gpio emulates open drain which is not
+ * optimal.
*/
- if (data->sda_is_open_drain && data->sda_pin != EP93XX_GPIO_LINE_EEDAT)
- pr_warning("sda != EEDAT, open drain has no effect\n");
- if (data->scl_is_open_drain && data->scl_pin != EP93XX_GPIO_LINE_EECLK)
- pr_warning("scl != EECLK, open drain has no effect\n");
-
- __raw_writel((data->sda_is_open_drain << 1) |
- (data->scl_is_open_drain << 0),
+ __raw_writel((0 << 1) | (0 << 0),
EP93XX_GPIO_EEDRIVE);
- ep93xx_i2c_data = *data;
i2c_register_board_info(0, devices, num);
+ gpiod_add_lookup_table(&ep93xx_i2c_gpiod_table);
platform_device_register(&ep93xx_i2c_device);
}
diff --git a/arch/arm/mach-ep93xx/edb93xx.c b/arch/arm/mach-ep93xx/edb93xx.c
index 7a7f280b07d7..8e89ec8b6f0f 100644
--- a/arch/arm/mach-ep93xx/edb93xx.c
+++ b/arch/arm/mach-ep93xx/edb93xx.c
@@ -28,7 +28,6 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
#include <linux/spi/spi.h>
#include <sound/cs4271.h>
@@ -61,14 +60,6 @@ static struct ep93xx_eth_data __initdata edb93xx_eth_data = {
/*************************************************************************
* EDB93xx i2c peripheral handling
*************************************************************************/
-static struct i2c_gpio_platform_data __initdata edb93xx_i2c_gpio_data = {
- .sda_pin = EP93XX_GPIO_LINE_EEDAT,
- .sda_is_open_drain = 0,
- .scl_pin = EP93XX_GPIO_LINE_EECLK,
- .scl_is_open_drain = 0,
- .udelay = 0, /* default to 100 kHz */
- .timeout = 0, /* default to 100 ms */
-};
static struct i2c_board_info __initdata edb93xxa_i2c_board_info[] = {
{
@@ -86,13 +77,11 @@ static void __init edb93xx_register_i2c(void)
{
if (machine_is_edb9302a() || machine_is_edb9307a() ||
machine_is_edb9315a()) {
- ep93xx_register_i2c(&edb93xx_i2c_gpio_data,
- edb93xxa_i2c_board_info,
+ ep93xx_register_i2c(edb93xxa_i2c_board_info,
ARRAY_SIZE(edb93xxa_i2c_board_info));
} else if (machine_is_edb9302() || machine_is_edb9307()
|| machine_is_edb9312() || machine_is_edb9315()) {
- ep93xx_register_i2c(&edb93xx_i2c_gpio_data,
- edb93xx_i2c_board_info,
+ ep93xx_register_i2c(edb93xx_i2c_board_info,
ARRAY_SIZE(edb93xx_i2c_board_info));
}
}
diff --git a/arch/arm/mach-ep93xx/include/mach/platform.h b/arch/arm/mach-ep93xx/include/mach/platform.h
index db0839691ef5..a686fd6caee1 100644
--- a/arch/arm/mach-ep93xx/include/mach/platform.h
+++ b/arch/arm/mach-ep93xx/include/mach/platform.h
@@ -7,7 +7,6 @@
#include <linux/reboot.h>
struct device;
-struct i2c_gpio_platform_data;
struct i2c_board_info;
struct spi_board_info;
struct platform_device;
@@ -36,8 +35,7 @@ void ep93xx_register_flash(unsigned int width,
resource_size_t start, resource_size_t size);
void ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr);
-void ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
- struct i2c_board_info *devices, int num);
+void ep93xx_register_i2c(struct i2c_board_info *devices, int num);
void ep93xx_register_spi(struct ep93xx_spi_info *info,
struct spi_board_info *devices, int num);
void ep93xx_register_fb(struct ep93xxfb_mach_info *data);
diff --git a/arch/arm/mach-ep93xx/simone.c b/arch/arm/mach-ep93xx/simone.c
index c7a40f245892..e61f3dee24c2 100644
--- a/arch/arm/mach-ep93xx/simone.c
+++ b/arch/arm/mach-ep93xx/simone.c
@@ -19,7 +19,6 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
#include <linux/mmc/host.h>
#include <linux/spi/spi.h>
#include <linux/spi/mmc_spi.h>
@@ -129,15 +128,6 @@ static struct ep93xx_spi_info simone_spi_info __initdata = {
.use_dma = 1,
};
-static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
- .sda_pin = EP93XX_GPIO_LINE_EEDAT,
- .sda_is_open_drain = 0,
- .scl_pin = EP93XX_GPIO_LINE_EECLK,
- .scl_is_open_drain = 0,
- .udelay = 0,
- .timeout = 0,
-};
-
static struct i2c_board_info __initdata simone_i2c_board_info[] = {
{
I2C_BOARD_INFO("ds1337", 0x68),
@@ -161,7 +151,7 @@ static void __init simone_init_machine(void)
ep93xx_register_flash(2, EP93XX_CS6_PHYS_BASE, SZ_8M);
ep93xx_register_eth(&simone_eth_data, 1);
ep93xx_register_fb(&simone_fb_info);
- ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
+ ep93xx_register_i2c(simone_i2c_board_info,
ARRAY_SIZE(simone_i2c_board_info));
ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
ARRAY_SIZE(simone_spi_devices));
diff --git a/arch/arm/mach-ep93xx/snappercl15.c b/arch/arm/mach-ep93xx/snappercl15.c
index 8b29398f4dc7..45940c1d7787 100644
--- a/arch/arm/mach-ep93xx/snappercl15.c
+++ b/arch/arm/mach-ep93xx/snappercl15.c
@@ -21,7 +21,6 @@
#include <linux/init.h>
#include <linux/io.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
#include <linux/fb.h>
#include <linux/mtd/partitions.h>
@@ -127,15 +126,6 @@ static struct ep93xx_eth_data __initdata snappercl15_eth_data = {
.phy_id = 1,
};
-static struct i2c_gpio_platform_data __initdata snappercl15_i2c_gpio_data = {
- .sda_pin = EP93XX_GPIO_LINE_EEDAT,
- .sda_is_open_drain = 0,
- .scl_pin = EP93XX_GPIO_LINE_EECLK,
- .scl_is_open_drain = 0,
- .udelay = 0,
- .timeout = 0,
-};
-
static struct i2c_board_info __initdata snappercl15_i2c_data[] = {
{
/* Audio codec */
@@ -161,7 +151,7 @@ static void __init snappercl15_init_machine(void)
{
ep93xx_init_devices();
ep93xx_register_eth(&snappercl15_eth_data, 1);
- ep93xx_register_i2c(&snappercl15_i2c_gpio_data, snappercl15_i2c_data,
+ ep93xx_register_i2c(snappercl15_i2c_data,
ARRAY_SIZE(snappercl15_i2c_data));
ep93xx_register_fb(&snappercl15_fb_info);
snappercl15_register_audio();
diff --git a/arch/arm/mach-ep93xx/vision_ep9307.c b/arch/arm/mach-ep93xx/vision_ep9307.c
index 1daf9441058c..5a0b6187990a 100644
--- a/arch/arm/mach-ep93xx/vision_ep9307.c
+++ b/arch/arm/mach-ep93xx/vision_ep9307.c
@@ -22,7 +22,6 @@
#include <linux/io.h>
#include <linux/mtd/partitions.h>
#include <linux/i2c.h>
-#include <linux/i2c-gpio.h>
#include <linux/platform_data/pca953x.h>
#include <linux/spi/spi.h>
#include <linux/spi/flash.h>
@@ -144,10 +143,6 @@ static struct pca953x_platform_data pca953x_77_gpio_data = {
/*************************************************************************
* I2C Bus
*************************************************************************/
-static struct i2c_gpio_platform_data vision_i2c_gpio_data __initdata = {
- .sda_pin = EP93XX_GPIO_LINE_EEDAT,
- .scl_pin = EP93XX_GPIO_LINE_EECLK,
-};
static struct i2c_board_info vision_i2c_info[] __initdata = {
{
@@ -289,7 +284,7 @@ static void __init vision_init_machine(void)
vision_i2c_info[1].irq = gpio_to_irq(EP93XX_GPIO_LINE_F(7));
- ep93xx_register_i2c(&vision_i2c_gpio_data, vision_i2c_info,
+ ep93xx_register_i2c(vision_i2c_info,
ARRAY_SIZE(vision_i2c_info));
ep93xx_register_spi(&vision_spi_master, vision_spi_board_info,
ARRAY_SIZE(vision_spi_board_info));