[PATCH 01/14] ARM: at91: gpio: implement request and free
From: Jean-Christophe PLAGNIOL-VILLARD <hidden>
Date: 2012-08-10 13:01:58
Subsystem:
arm port, arm/microchip (at91) soc support, the rest · Maintainers:
Russell King, Nicolas Ferre, Alexandre Belloni, Claudiu Beznea, Linus Torvalds
Configure a gpio as input when freeing it to reduce power consumption/ Confire the pin as pio when requested. This is need by DT as we do not mux them any more. Cc: Linus Walleij <redacted> Cc: Nicolas Ferre <redacted> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <redacted> --- arch/arm/mach-at91/gpio.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c
index be42cf0..3770d72 100644
--- a/arch/arm/mach-at91/gpio.c
+++ b/arch/arm/mach-at91/gpio.c@@ -46,6 +46,8 @@ struct at91_gpio_chip { #define to_at91_gpio_chip(c) container_of(c, struct at91_gpio_chip, chip) +static int at91_gpiolib_request(struct gpio_chip *chip, unsigned offset); +static void at91_gpiolib_free(struct gpio_chip *chip, unsigned offset); static void at91_gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip); static void at91_gpiolib_set(struct gpio_chip *chip, unsigned offset, int val); static int at91_gpiolib_get(struct gpio_chip *chip, unsigned offset);
@@ -59,6 +61,8 @@ static int at91_gpiolib_to_irq(struct gpio_chip *chip, unsigned offset); { \ .chip = { \ .label = name, \ + .request = at91_gpiolib_request, \ + .free = at91_gpiolib_free, \ .direction_input = at91_gpiolib_direction_input, \ .direction_output = at91_gpiolib_direction_output, \ .get = at91_gpiolib_get, \
@@ -862,6 +866,21 @@ void __init at91_gpio_irq_setup(void) } /* gpiolib support */ +static void at91_gpiolib_free(struct gpio_chip *chip, unsigned offset) +{ + at91_gpiolib_direction_input(chip, offset); +} + +static int at91_gpiolib_request(struct gpio_chip *chip, unsigned offset) +{ + struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip); + void __iomem *pio = at91_gpio->regbase; + unsigned mask = 1 << offset; + + __raw_writel(mask, pio + PIO_PER); + return 0; +} + static int at91_gpiolib_direction_input(struct gpio_chip *chip, unsigned offset) {
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1.7.10.4