diff options
| author | Eric Nelson <eric@nelint.com> | 2016-04-24 16:32:40 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2016-05-17 09:54:43 -0600 |
| commit | 6c880b7719d73dc4bf4bf828b6341e086e6f5eb6 (patch) | |
| tree | 986f58750ecdee418484d05add68300556df3e1c /include | |
| parent | c0c62d923344d5a68f43259282e68a827318db01 (diff) | |
| download | u-boot-6c880b7719d73dc4bf4bf828b6341e086e6f5eb6.zip u-boot-6c880b7719d73dc4bf4bf828b6341e086e6f5eb6.tar.gz u-boot-6c880b7719d73dc4bf4bf828b6341e086e6f5eb6.tar.bz2 | |
dm: gpio: add a default gpio xlate routine
Many drivers use a common form of offset + flags for device
tree nodes. e.g.:
<&gpio1 2 GPIO_ACTIVE_LOW>
This patch adds a common implementation of this type of parsing
and calls it when a gpio driver doesn't supply its' own xlate
routine.
This will allow removal of the driver-specific versions in a
handful of drivers and simplify the addition of new drivers.
Signed-off-by: Eric Nelson <eric@nelint.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/gpio.h | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 68b5f0b..2500c10 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -207,6 +207,16 @@ int gpio_requestf(unsigned gpio, const char *fmt, ...) struct fdtdec_phandle_args; /** + * gpio_xlate_offs_flags() - implementation for common use of dm_gpio_ops.xlate + * + * This routine sets the offset field to args[0] and the flags field to + * GPIOD_ACTIVE_LOW if the GPIO_ACTIVE_LOW flag is present in args[1]. + * + */ +int gpio_xlate_offs_flags(struct udevice *dev, struct gpio_desc *desc, + struct fdtdec_phandle_args *args); + +/** * struct struct dm_gpio_ops - Driver model GPIO operations * * Refer to functions above for description. These function largely copy @@ -258,12 +268,11 @@ struct dm_gpio_ops { * * @desc->dev to @dev * @desc->flags to 0 - * @desc->offset to the value of the first argument in args, if any, - * otherwise -1 (which is invalid) + * @desc->offset to 0 * - * This method is optional so if the above defaults suit it can be - * omitted. Typical behaviour is to set up the GPIOD_ACTIVE_LOW flag - * in desc->flags. + * This method is optional and defaults to gpio_xlate_offs_flags, + * which will parse offset and the GPIO_ACTIVE_LOW flag in the first + * two arguments. * * Note that @dev is passed in as a parameter to follow driver model * uclass conventions, even though it is already available as |