diff options
| author | Chuanhong Guo <gch981213@gmail.com> | 2020-03-15 20:13:37 +0800 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2020-03-25 09:50:45 +0100 |
| commit | d19d2de61fb131abcd29f7c61d3f168f687bfd6e (patch) | |
| tree | fda8cb7a01b6d9df22d36c5c8e5b4c1a6feb5dc7 /include | |
| parent | d1ee7e1f5c9191afb69ce46cc7752e4257340a31 (diff) | |
| download | linux-d19d2de61fb131abcd29f7c61d3f168f687bfd6e.tar.bz2 | |
gpio: mmio: introduce BGPIOF_NO_SET_ON_INPUT
Some gpio controllers ignores pin value writing when that pin is
configured as input mode. As a result, bgpio_dir_out should set
pin to output before configuring pin values or gpio pin values
can't be set up properly.
Introduce two variants of bgpio_dir_out: bgpio_dir_out_val_first
and bgpio_dir_out_dir_first, and assign direction_output according
to a new flag: BGPIOF_NO_SET_ON_INPUT.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Tested-by: René van Dorst <opensource@vdorst.com>
Reviewed-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/gpio/driver.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 6ef05bccc0a6..ed65e00ee977 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -572,6 +572,7 @@ int bgpio_init(struct gpio_chip *gc, struct device *dev, #define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3) #define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */ #define BGPIOF_NO_OUTPUT BIT(5) /* only input */ +#define BGPIOF_NO_SET_ON_INPUT BIT(6) int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hwirq); |