diff options
| author | Nava kishore Manne <nava.manne@xilinx.com> | 2016-09-23 16:56:58 +0530 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-09-23 15:26:20 +0200 |
| commit | e3296f19c8620a9c47b6734df84c4b3126d2fe46 (patch) | |
| tree | f0b2663c695cdf0031c137e3840dbb20b9c47b97 /drivers/gpio | |
| parent | 81d3753d9ea540c38b906399822a963e3b44a045 (diff) | |
| download | linux-e3296f19c8620a9c47b6734df84c4b3126d2fe46.tar.gz linux-e3296f19c8620a9c47b6734df84c4b3126d2fe46.tar.bz2 linux-e3296f19c8620a9c47b6734df84c4b3126d2fe46.zip | |
gpio: Added zynq specific check for special pins on bank zero
This patch adds zynq specific check for bank 0 pins 7 and 8
are special and cannot be used as inputs
Signed-off-by: Nava kishore Manne <navam@xilinx.com>
Reported-by: Jonas Karlsson <Jonas.d.karlsson@gmail.com>
Acked-by: Sören Brinkmann <soren.brinkmann@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-zynq.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c index e72794e463aa..6b4d10d6e10f 100644 --- a/drivers/gpio/gpio-zynq.c +++ b/drivers/gpio/gpio-zynq.c @@ -96,6 +96,9 @@ /* GPIO upper 16 bit mask */ #define ZYNQ_GPIO_UPPER_MASK 0xFFFF0000 +/* For GPIO quirks */ +#define ZYNQ_GPIO_QUIRK_FOO BIT(0) + /** * struct zynq_gpio - gpio device private data structure * @chip: instance of the gpio_chip @@ -122,6 +125,7 @@ struct zynq_gpio { */ struct zynq_platform_data { const char *label; + u32 quirks; u16 ngpio; int max_bank; int bank_min[ZYNQMP_GPIO_MAX_BANK]; @@ -238,13 +242,19 @@ static void zynq_gpio_set_value(struct gpio_chip *chip, unsigned int pin, static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin) { u32 reg; + bool is_zynq_gpio; unsigned int bank_num, bank_pin_num; struct zynq_gpio *gpio = gpiochip_get_data(chip); + is_zynq_gpio = gpio->p_data->quirks & ZYNQ_GPIO_QUIRK_FOO; zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio); - /* bank 0 pins 7 and 8 are special and cannot be used as inputs */ - if (bank_num == 0 && (bank_pin_num == 7 || bank_pin_num == 8)) + /* + * On zynq bank 0 pins 7 and 8 are special and cannot be used + * as inputs. + */ + if (is_zynq_gpio && bank_num == 0 && + (bank_pin_num == 7 || bank_pin_num == 8)) return -EINVAL; /* clear the bit in direction mode reg to set the pin as input */ @@ -627,6 +637,7 @@ static const struct zynq_platform_data zynqmp_gpio_def = { static const struct zynq_platform_data zynq_gpio_def = { .label = "zynq_gpio", + .quirks = ZYNQ_GPIO_QUIRK_FOO, .ngpio = ZYNQ_GPIO_NR_GPIOS, .max_bank = ZYNQ_GPIO_MAX_BANK, .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(), |