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gpio: add ops to set dir flags 

Add the ops for GPIO driver set_dir_flags() to set the dir flags.
The user can update the direction and configuration
of each GPIO with a only call to dm_gpio_set_dir_flags() or
dm_gpio_set_dir() and respecting the configuration provided by
device tree (saved in desc->flags).

When these optional ops are absent, the gpio uclass use the mandatory
ops (direction_output, direction_input, get_value) and desc->flags
to manage only the main dir flags:
- GPIOD_IS_IN
- GPIOD_IS_OUT
- GPIOD_IS_OUT_ACTIVE
- GPIOD_ACTIVE_LOW

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Patrick Delaunay 2020-01-13 11:35:09 +01:00 committed by Tom Rini
parent d2c07e56ab
commit 8fd9daf036
2 changed files with 28 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/gpio/gpio-uclass.c
View File

@ -572,11 +572,16 @@ static int _dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
return ret;
}
if (flags & GPIOD_IS_OUT) {
ret = ops->direction_output(dev, desc->offset,
GPIOD_FLAGS_OUTPUT(flags));
} else if (flags & GPIOD_IS_IN) {
ret = ops->direction_input(dev, desc->offset);
/* GPIOD_ are directly managed by driver in set_dir_flags*/
if (ops->set_dir_flags) {
ret = ops->set_dir_flags(dev, desc->offset, flags);
} else {
if (flags & GPIOD_IS_OUT) {
ret = ops->direction_output(dev, desc->offset,
GPIOD_FLAGS_OUTPUT(flags));
} else if (flags & GPIOD_IS_IN) {
ret = ops->direction_input(dev, desc->offset);
}
}
return ret;
@ -1146,6 +1151,8 @@ static int gpio_post_bind(struct udevice *dev)
ops->get_function += gd->reloc_off;
if (ops->xlate)
ops->xlate += gd->reloc_off;
if (ops->set_dir_flags)
ops->set_dir_flags += gd->reloc_off;
if (ops->get_dir_flags)
ops->get_dir_flags += gd->reloc_off;

16
include/asm-generic/gpio.h
View File

@ -298,6 +298,22 @@ struct dm_gpio_ops {
int (*xlate)(struct udevice *dev, struct gpio_desc *desc,
struct ofnode_phandle_args *args);
/**
* set_dir_flags() - Set GPIO dir flags
*
* This function should set up the GPIO configuration according to the
* information provide by the direction flags bitfield.
*
* This method is optional.
*
* @dev: GPIO device
* @offset: GPIO offset within that device
* @flags: GPIO configuration to use
* @return 0 if OK, -ve on error
*/
int (*set_dir_flags)(struct udevice *dev, unsigned int offset,
ulong flags);
/**
* get_dir_flags() - Get GPIO dir flags
*