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gpio: em: Add pinctrl support

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Register the GPIO pin range, and request and free GPIO pins using the
pinctrl API. The pctl_name platform data member should be used by
platform devices to point out which pinctrl device to use.

Follows same style as "dc3465a gpio-rcar: Add pinctrl support",
by Laurent Pinchart, thanks to him.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Magnus Damm 2013-07-03 13:14:32 +09:00 committed by Linus Walleij
parent d22fcde0b5
commit 640efa08cb
2 changed files with 26 additions and 0 deletions
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25
drivers/gpio/gpio-em.c
View file

@ -30,6 +30,7 @@
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_data/gpio-em.h>
struct em_gio_priv {
@ -216,6 +217,21 @@ static int em_gio_to_irq(struct gpio_chip *chip, unsigned offset)
return irq_create_mapping(gpio_to_priv(chip)->irq_domain, offset);
}
static int em_gio_request(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_request_gpio(chip->base + offset);
}
static void em_gio_free(struct gpio_chip *chip, unsigned offset)
{
pinctrl_free_gpio(chip->base + offset);
/* Set the GPIO as an input to ensure that the next GPIO request won't
* drive the GPIO pin as an output.
*/
em_gio_direction_input(chip, offset);
}
static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
@ -308,6 +324,8 @@ static int em_gio_probe(struct platform_device *pdev)
gpio_chip->direction_output = em_gio_direction_output;
gpio_chip->set = em_gio_set;
gpio_chip->to_irq = em_gio_to_irq;
gpio_chip->request = em_gio_request;
gpio_chip->free = em_gio_free;
gpio_chip->label = name;
gpio_chip->owner = THIS_MODULE;
gpio_chip->base = pdata->gpio_base;
@ -351,6 +369,13 @@ static int em_gio_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "failed to add GPIO controller\n");
goto err1;
}
if (pdata->pctl_name) {
ret = gpiochip_add_pin_range(gpio_chip, pdata->pctl_name, 0,
gpio_chip->base, gpio_chip->ngpio);
if (ret < 0)
dev_warn(&pdev->dev, "failed to add pin range\n");
}
return 0;
err1:

1
include/linux/platform_data/gpio-em.h
View file

@ -5,6 +5,7 @@ struct gpio_em_config {
unsigned int gpio_base;
unsigned int irq_base;
unsigned int number_of_pins;
const char *pctl_name;
};
#endif /* __GPIO_EM_H__ */