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>
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@ -17,6 +17,7 @@
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#include <linux/mtd/rawnand.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/gpio/machine.h>
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#include <linux/clk.h>
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#include <linux/videodev2.h>
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#include <media/i2c/tvp514x.h>
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@ -108,11 +109,20 @@ static struct platform_device davinci_nand_device = {
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},
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};
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static struct gpiod_lookup_table i2c_recovery_gpiod_table = {
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.dev_id = "i2c_davinci",
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.table = {
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GPIO_LOOKUP("davinci_gpio", 15, "sda",
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GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
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GPIO_LOOKUP("davinci_gpio", 14, "scl",
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GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
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},
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};
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static struct davinci_i2c_platform_data i2c_pdata = {
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.bus_freq = 400 /* kHz */,
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.bus_delay = 0 /* usec */,
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.sda_pin = 15,
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.scl_pin = 14,
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.gpio_recovery = true,
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};
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static int dm355evm_mmc_gpios = -EINVAL;
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@ -141,6 +151,7 @@ static struct i2c_board_info dm355evm_i2c_info[] = {
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static void __init evm_init_i2c(void)
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{
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gpiod_add_lookup_table(&i2c_recovery_gpiod_table);
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davinci_init_i2c(&i2c_pdata);
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gpio_request(5, "dm355evm_msp");
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@ -13,6 +13,7 @@
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#include <linux/dma-mapping.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/gpio/machine.h>
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#include <linux/i2c.h>
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#include <linux/platform_data/pcf857x.h>
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#include <linux/platform_data/at24.h>
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@ -595,18 +596,28 @@ static struct i2c_board_info __initdata i2c_info[] = {
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},
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};
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static struct gpiod_lookup_table i2c_recovery_gpiod_table = {
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.dev_id = "i2c_davinci",
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.table = {
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GPIO_LOOKUP("davinci_gpio", 44, "sda",
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GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
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GPIO_LOOKUP("davinci_gpio", 43, "scl",
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GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
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},
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};
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/* The msp430 uses a slow bitbanged I2C implementation (ergo 20 KHz),
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* which requires 100 usec of idle bus after i2c writes sent to it.
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*/
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static struct davinci_i2c_platform_data i2c_pdata = {
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.bus_freq = 20 /* kHz */,
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.bus_delay = 100 /* usec */,
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.sda_pin = 44,
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.scl_pin = 43,
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.gpio_recovery = true,
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};
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static void __init evm_init_i2c(void)
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{
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gpiod_add_lookup_table(&i2c_recovery_gpiod_table);
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davinci_init_i2c(&i2c_pdata);
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i2c_add_driver(&dm6446evm_msp_driver);
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i2c_register_board_info(1, i2c_info, ARRAY_SIZE(i2c_info));
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@ -33,7 +33,7 @@
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/cpufreq.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of_device.h>
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#include <linux/platform_data/i2c-davinci.h>
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#include <linux/pm_runtime.h>
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@ -869,19 +869,20 @@ static int davinci_i2c_probe(struct platform_device *pdev)
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if (dev->pdata->has_pfunc)
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adap->bus_recovery_info = &davinci_i2c_scl_recovery_info;
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else if (dev->pdata->scl_pin) {
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else if (dev->pdata->gpio_recovery) {
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rinfo = &davinci_i2c_gpio_recovery_info;
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adap->bus_recovery_info = rinfo;
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r = gpio_request_one(dev->pdata->scl_pin, GPIOF_OPEN_DRAIN |
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GPIOF_OUT_INIT_HIGH, "i2c-scl");
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if (r)
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rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl",
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GPIOD_OUT_HIGH_OPEN_DRAIN);
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if (IS_ERR(rinfo->scl_gpiod)) {
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r = PTR_ERR(rinfo->scl_gpiod);
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goto err_unuse_clocks;
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rinfo->scl_gpiod = gpio_to_desc(dev->pdata->scl_pin);
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r = gpio_request_one(dev->pdata->sda_pin, GPIOF_IN, "i2c-sda");
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if (r)
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}
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rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN);
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if (IS_ERR(rinfo->sda_gpiod)) {
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r = PTR_ERR(rinfo->sda_gpiod);
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goto err_unuse_clocks;
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rinfo->sda_gpiod = gpio_to_desc(dev->pdata->scl_pin);
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}
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}
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adap->nr = pdev->id;
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@ -16,9 +16,8 @@
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struct davinci_i2c_platform_data {
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unsigned int bus_freq; /* standard bus frequency (kHz) */
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unsigned int bus_delay; /* post-transaction delay (usec) */
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unsigned int sda_pin; /* GPIO pin ID to use for SDA */
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unsigned int scl_pin; /* GPIO pin ID to use for SCL */
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bool has_pfunc; /*chip has a ICPFUNC register */
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bool gpio_recovery; /* Use GPIO recovery method */
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bool has_pfunc; /* Chip has a ICPFUNC register */
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};
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/* for board setup code */
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