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gpio: update dir_flags management

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Update the flag management in GPIO uclass: the desc->flags is always
combined with the requested flags and the GPIO descriptor is updated
for further call.

Add a function dm_gpio_get_dir_flags to get dynamically
the current dir_flags (configuration and value).

This patch prepare introduction of the dir flags support with new ops.

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 11:35:06 +01:00 committed by Tom Rini
parent 9360bb06f1
commit 695e5fd546
2 changed files with 41 additions and 8 deletions
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27
drivers/gpio/gpio-uclass.c
View file

@ -141,8 +141,9 @@ int gpio_xlate_offs_flags(struct udevice *dev, struct gpio_desc *desc,
if (args->args_count < 2)
return 0;
desc->flags = 0;
if (args->args[1] & GPIO_ACTIVE_LOW)
desc->flags = GPIOD_ACTIVE_LOW;
desc->flags |= GPIOD_ACTIVE_LOW;
return 0;
}
@ -559,6 +560,8 @@ int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
if (ret)
return ret;
/* combine the requested flags (for IN/OUT) and the descriptor flags */
flags |= desc->flags;
ret = _dm_gpio_set_dir_flags(desc, flags);
/* update the descriptor flags */
@ -579,6 +582,26 @@ int dm_gpio_set_dir(struct gpio_desc *desc)
return _dm_gpio_set_dir_flags(desc, desc->flags);
}
int dm_gpio_get_dir_flags(struct gpio_desc *desc, ulong *flags)
{
int ret;
ulong dir_flags;
ret = check_reserved(desc, "get_dir_flags");
if (ret)
return ret;
dir_flags = desc->flags;
/* only GPIOD_IS_OUT_ACTIVE is provided by uclass */
dir_flags &= ~GPIOD_IS_OUT_ACTIVE;
if ((desc->flags & GPIOD_IS_OUT) && _gpio_get_value(desc))
dir_flags |= GPIOD_IS_OUT_ACTIVE;
*flags = dir_flags;
return 0;
}
/**
* gpio_get_value() - [COMPAT] Sample GPIO pin and return it's value
* gpio: GPIO number
@ -849,7 +872,7 @@ static int gpio_request_tail(int ret, const char *nodename,
debug("%s: dm_gpio_requestf failed\n", __func__);
goto err;
}
ret = dm_gpio_set_dir_flags(desc, flags | desc->flags);
ret = dm_gpio_set_dir_flags(desc, flags);
if (ret) {
debug("%s: dm_gpio_set_dir failed\n", __func__);
goto err;

22
include/asm-generic/gpio.h
View file

@ -592,8 +592,7 @@ int dm_gpio_set_value(const struct gpio_desc *desc, int value);
/**
* dm_gpio_set_dir() - Set the direction for a GPIO
*
* This sets up the direction according tot the provided flags. It will do
* nothing unless the direction is actually specified.
* This sets up the direction according to the GPIO flags: desc->flags.
*
* @desc: GPIO description containing device, offset and flags,
* previously returned by gpio_request_by_name()
@ -602,11 +601,10 @@ int dm_gpio_set_value(const struct gpio_desc *desc, int value);
int dm_gpio_set_dir(struct gpio_desc *desc);
/**
* dm_gpio_set_dir_flags() - Set direction using specific flags
* dm_gpio_set_dir_flags() - Set direction using description and added flags
*
* This is like dm_gpio_set_dir() except that the flags value is provided
* instead of being used from desc->flags. This is needed because in many
* cases the GPIO description does not include direction information.
* This sets up the direction according to the provided flags and the GPIO
* description (desc->flags) which include direction information.
* Note that desc->flags is updated by this function.
*
* @desc: GPIO description containing device, offset and flags,
@ -616,6 +614,18 @@ int dm_gpio_set_dir(struct gpio_desc *desc);
*/
int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags);
/**
* dm_gpio_get_dir_flags() - Get direction flags
*
* read the current direction flags
*
* @desc: GPIO description containing device, offset and flags,
* previously returned by gpio_request_by_name()
* @flags: place to put the used flags
* @return 0 if OK, -ve on error, in which case desc->flags is not updated
*/
int dm_gpio_get_dir_flags(struct gpio_desc *desc, ulong *flags);
/**
* gpio_get_number() - Get the global GPIO number of a GPIO
*