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dm: gpio: add a default gpio xlate routine

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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>
This commit is contained in:
Eric Nelson 2016-04-24 16:32:40 -07:00 • committed by Simon Glass
parent c0c62d9233
commit 6c880b7719
2 changed files with 37 additions and 12 deletions
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19
include/asm-generic/gpio.h
View file

@ -206,6 +206,16 @@ 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
*
@ -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