i2c/ARM: davinci: Deep refactoring of I2C recovery

Alter the DaVinci GPIO recovery fetch to use descriptors
all the way down into the board files.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Tested-by: Sekhar Nori <nsekhar@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/arch/arm/mach-davinci/board-dm355-evm.c b/arch/arm/mach-davinci/board-dm355-evm.c
index 62e7bc3..e457f29 100644 (file)
--- a/arch/arm/mach-davinci/board-dm355-evm.c
+++ b/arch/arm/mach-davinci/board-dm355-evm.c
@@ -17,6 +17,7 @@
 #include <linux/mtd/rawnand.h>
 #include <linux/i2c.h>
 #include <linux/gpio.h>
+#include <linux/gpio/machine.h>
 #include <linux/clk.h>
 #include <linux/videodev2.h>
 #include <media/i2c/tvp514x.h>
@@ -108,11 +109,20 @@ static struct platform_device davinci_nand_device = {
        },
 };
 
+static struct gpiod_lookup_table i2c_recovery_gpiod_table = {
+       .dev_id = "i2c_davinci",
+       .table = {
+               GPIO_LOOKUP("davinci_gpio", 15, "sda",
+                           GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
+               GPIO_LOOKUP("davinci_gpio", 14, "scl",
+                           GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
+       },
+};
+
 static struct davinci_i2c_platform_data i2c_pdata = {
        .bus_freq       = 400   /* kHz */,
        .bus_delay      = 0     /* usec */,
-       .sda_pin        = 15,
-       .scl_pin        = 14,
+       .gpio_recovery  = true,
 };
 
 static int dm355evm_mmc_gpios = -EINVAL;
@@ -141,6 +151,7 @@ static struct i2c_board_info dm355evm_i2c_info[] = {
 
 static void __init evm_init_i2c(void)
 {
+       gpiod_add_lookup_table(&i2c_recovery_gpiod_table);
        davinci_init_i2c(&i2c_pdata);
 
        gpio_request(5, "dm355evm_msp");

diff --git a/arch/arm/mach-davinci/board-dm644x-evm.c b/arch/arm/mach-davinci/board-dm644x-evm.c
index b07c9b1..85e6fb3 100644 (file)
--- a/arch/arm/mach-davinci/board-dm644x-evm.c
+++ b/arch/arm/mach-davinci/board-dm644x-evm.c
@@ -13,6 +13,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
+#include <linux/gpio/machine.h>
 #include <linux/i2c.h>
 #include <linux/platform_data/pcf857x.h>
 #include <linux/platform_data/at24.h>
@@ -595,18 +596,28 @@ static struct i2c_board_info __initdata i2c_info[] =  {
        },
 };
 
+static struct gpiod_lookup_table i2c_recovery_gpiod_table = {
+       .dev_id = "i2c_davinci",
+       .table = {
+               GPIO_LOOKUP("davinci_gpio", 44, "sda",
+                           GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
+               GPIO_LOOKUP("davinci_gpio", 43, "scl",
+                           GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
+       },
+};
+
 /* The msp430 uses a slow bitbanged I2C implementation (ergo 20 KHz),
  * which requires 100 usec of idle bus after i2c writes sent to it.
  */
 static struct davinci_i2c_platform_data i2c_pdata = {
        .bus_freq       = 20 /* kHz */,
        .bus_delay      = 100 /* usec */,
-       .sda_pin        = 44,
-       .scl_pin        = 43,
+       .gpio_recovery  = true,
 };
 
 static void __init evm_init_i2c(void)
 {
+       gpiod_add_lookup_table(&i2c_recovery_gpiod_table);
        davinci_init_i2c(&i2c_pdata);
        i2c_add_driver(&dm6446evm_msp_driver);
        i2c_register_board_info(1, i2c_info, ARRAY_SIZE(i2c_info));

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index 2afb12a..cb24a3f 100644 (file)
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -33,7 +33,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/cpufreq.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/of_device.h>
 #include <linux/platform_data/i2c-davinci.h>
 #include <linux/pm_runtime.h>
@@ -869,19 +869,20 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 
        if (dev->pdata->has_pfunc)
                adap->bus_recovery_info = &davinci_i2c_scl_recovery_info;
-       else if (dev->pdata->scl_pin) {
+       else if (dev->pdata->gpio_recovery) {
                rinfo =  &davinci_i2c_gpio_recovery_info;
                adap->bus_recovery_info = rinfo;
-               r = gpio_request_one(dev->pdata->scl_pin, GPIOF_OPEN_DRAIN |
-                                    GPIOF_OUT_INIT_HIGH, "i2c-scl");
-               if (r)
+               rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl",
+                                                 GPIOD_OUT_HIGH_OPEN_DRAIN);
+               if (IS_ERR(rinfo->scl_gpiod)) {
+                       r = PTR_ERR(rinfo->scl_gpiod);
                        goto err_unuse_clocks;
-               rinfo->scl_gpiod = gpio_to_desc(dev->pdata->scl_pin);
-
-               r = gpio_request_one(dev->pdata->sda_pin, GPIOF_IN, "i2c-sda");
-               if (r)
+               }
+               rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN);
+               if (IS_ERR(rinfo->sda_gpiod)) {
+                       r = PTR_ERR(rinfo->sda_gpiod);
                        goto err_unuse_clocks;
-               rinfo->sda_gpiod = gpio_to_desc(dev->pdata->scl_pin);
+               }
        }
 
        adap->nr = pdev->id;

diff --git a/include/linux/platform_data/i2c-davinci.h b/include/linux/platform_data/i2c-davinci.h
index 89fd347..98967df 100644 (file)
--- a/include/linux/platform_data/i2c-davinci.h
+++ b/include/linux/platform_data/i2c-davinci.h
@@ -16,9 +16,8 @@
 struct davinci_i2c_platform_data {
        unsigned int    bus_freq;       /* standard bus frequency (kHz) */
        unsigned int    bus_delay;      /* post-transaction delay (usec) */
-       unsigned int    sda_pin;        /* GPIO pin ID to use for SDA */
-       unsigned int    scl_pin;        /* GPIO pin ID to use for SCL */
-       bool            has_pfunc;      /*chip has a ICPFUNC register */
+       bool            gpio_recovery;  /* Use GPIO recovery method */
+       bool            has_pfunc;      /* Chip has a ICPFUNC register */
 };
 
 /* for board setup code */