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gpiolib: Convert fwnode_get_named_gpiod() to configure GPIO

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Make fwnode_get_named_gpiod() consistent with the rest of
gpiod_get() like API, i.e. configure GPIO pin immediately after
request.

Besides obvious clean up it will help to configure pins based
on firmware provided resources.

Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andy Shevchenko 2017-01-09 16:02:28 +02:00 committed by Linus Walleij
parent 7ce7d89f48
commit a264d10ff4
7 changed files with 45 additions and 40 deletions
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9
drivers/gpio/devres.c
View File

@ -127,13 +127,18 @@ EXPORT_SYMBOL(devm_gpiod_get_index);
* @dev: GPIO consumer
* @con_id: function within the GPIO consumer
* @child: firmware node (child of @dev)
* @flags: GPIO initialization flags
*
* GPIO descriptors returned from this function are automatically disposed on
* driver detach.
*
* On successfull request the GPIO pin is configured in accordance with
* provided @flags.
*/
struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
const char *con_id,
struct fwnode_handle *child)
struct fwnode_handle *child,
enum gpiod_flags flags)
{
static const char * const suffixes[] = { "gpios", "gpio" };
char prop_name[32]; /* 32 is max size of property name */
@ -154,7 +159,7 @@ struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
snprintf(prop_name, sizeof(prop_name), "%s",
suffixes[i]);
desc = fwnode_get_named_gpiod(child, prop_name);
desc = fwnode_get_named_gpiod(child, prop_name, flags);
if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT))
break;
}

20
drivers/gpio/gpiolib.c
View File

@ -3309,6 +3309,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_index);
* fwnode_get_named_gpiod - obtain a GPIO from firmware node
* @fwnode: handle of the firmware node
* @propname: name of the firmware property representing the GPIO
* @dflags: GPIO initialization flags
*
* This function can be used for drivers that get their configuration
* from firmware.
@ -3317,12 +3318,17 @@ EXPORT_SYMBOL_GPL(gpiod_get_index);
* underlying firmware interface and then makes sure that the GPIO
* descriptor is requested before it is returned to the caller.
*
* On successfull request the GPIO pin is configured in accordance with
* provided @dflags.
*
* In case of error an ERR_PTR() is returned.
*/
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
const char *propname)
const char *propname,
enum gpiod_flags dflags)
{
struct gpio_desc *desc = ERR_PTR(-ENODEV);
unsigned long lflags = 0;
bool active_low = false;
bool single_ended = false;
int ret;
@ -3355,13 +3361,19 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
return ERR_PTR(ret);
if (active_low)
set_bit(FLAG_ACTIVE_LOW, &desc->flags);
lflags |= GPIO_ACTIVE_LOW;
if (single_ended) {
if (active_low)
set_bit(FLAG_OPEN_DRAIN, &desc->flags);
lflags |= GPIO_OPEN_DRAIN;
else
set_bit(FLAG_OPEN_SOURCE, &desc->flags);
lflags |= GPIO_OPEN_SOURCE;
}
ret = gpiod_configure_flags(desc, propname, lflags, dflags);
if (ret < 0) {
gpiod_put(desc);
return ERR_PTR(ret);
}
return desc;

9
drivers/input/keyboard/gpio_keys.c
View File

@ -481,7 +481,7 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
spin_lock_init(&bdata->lock);
if (child) {
bdata->gpiod = devm_get_gpiod_from_child(dev, NULL, child);
bdata->gpiod = devm_get_gpiod_from_child(dev, NULL, child, GPIOD_IN);
if (IS_ERR(bdata->gpiod)) {
error = PTR_ERR(bdata->gpiod);
if (error == -ENOENT) {
@ -496,13 +496,6 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
error);
return error;
}
} else {
error = gpiod_direction_input(bdata->gpiod);
if (error) {
dev_err(dev, "Failed to configure GPIO %d as input: %d\n",
desc_to_gpio(bdata->gpiod), error);
return error;
}
}
} else if (gpio_is_valid(button->gpio)) {
/*

11
drivers/input/keyboard/gpio_keys_polled.c
View File

@ -304,7 +304,8 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
}
bdata->gpiod = devm_get_gpiod_from_child(dev, NULL,
child);
child,
GPIOD_IN);
if (IS_ERR(bdata->gpiod)) {
error = PTR_ERR(bdata->gpiod);
if (error != -EPROBE_DEFER)
@ -314,14 +315,6 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
fwnode_handle_put(child);
return error;
}
error = gpiod_direction_input(bdata->gpiod);
if (error) {
dev_err(dev, "Failed to configure GPIO %d as input: %d\n",
desc_to_gpio(bdata->gpiod), error);
fwnode_handle_put(child);
return error;
}
} else if (gpio_is_valid(button->gpio)) {
/*
* Legacy GPIO number so request the GPIO here and

2
drivers/leds/leds-gpio.c
View File

@ -174,7 +174,7 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
const char *state = NULL;
struct device_node *np = to_of_node(child);
led.gpiod = devm_get_gpiod_from_child(dev, NULL, child);
led.gpiod = devm_get_gpiod_from_child(dev, NULL, child, GPIOD_ASIS);
if (IS_ERR(led.gpiod)) {
fwnode_handle_put(child);
return ERR_CAST(led.gpiod);

15
drivers/video/fbdev/amba-clcd-nomadik.c
View File

@ -184,32 +184,27 @@ static void tpg110_init(struct device *dev, struct device_node *np,
{
dev_info(dev, "TPG110 display init\n");
grestb = devm_get_gpiod_from_child(dev, "grestb", &np->fwnode);
/* This asserts the GRESTB signal, putting the display into reset */
grestb = devm_get_gpiod_from_child(dev, "grestb", &np->fwnode, GPIOD_OUT_HIGH);
if (IS_ERR(grestb)) {
dev_err(dev, "no GRESTB GPIO\n");
return;
}
/* This asserts the GRESTB signal, putting the display into reset */
gpiod_direction_output(grestb, 1);
scen = devm_get_gpiod_from_child(dev, "scen", &np->fwnode);
scen = devm_get_gpiod_from_child(dev, "scen", &np->fwnode, GPIOD_OUT_LOW);
if (IS_ERR(scen)) {
dev_err(dev, "no SCEN GPIO\n");
return;
}
gpiod_direction_output(scen, 0);
scl = devm_get_gpiod_from_child(dev, "scl", &np->fwnode);
scl = devm_get_gpiod_from_child(dev, "scl", &np->fwnode, GPIOD_OUT_LOW);
if (IS_ERR(scl)) {
dev_err(dev, "no SCL GPIO\n");
return;
}
gpiod_direction_output(scl, 0);
sda = devm_get_gpiod_from_child(dev, "sda", &np->fwnode);
sda = devm_get_gpiod_from_child(dev, "sda", &np->fwnode, GPIOD_OUT_LOW);
if (IS_ERR(sda)) {
dev_err(dev, "no SDA GPIO\n");
return;
}
gpiod_direction_output(sda, 0);
board->enable = tpg110_enable;
board->disable = tpg110_disable;
}

19
include/linux/gpio/consumer.h
View File

@ -135,10 +135,12 @@ int desc_to_gpio(const struct gpio_desc *desc);
struct fwnode_handle;
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
const char *propname);
const char *propname,
enum gpiod_flags dflags);
struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
const char *con_id,
struct fwnode_handle *child);
struct fwnode_handle *child,
enum gpiod_flags flags);
#else /* CONFIG_GPIOLIB */
static inline int gpiod_count(struct device *dev, const char *con_id)
@ -411,14 +413,19 @@ static inline int desc_to_gpio(const struct gpio_desc *desc)
/* Child properties interface */
struct fwnode_handle;
static inline struct gpio_desc *fwnode_get_named_gpiod(
struct fwnode_handle *fwnode, const char *propname)
static inline
struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
const char *propname,
enum gpiod_flags dflags)
{
return ERR_PTR(-ENOSYS);
}
static inline struct gpio_desc *devm_get_gpiod_from_child(
struct device *dev, const char *con_id, struct fwnode_handle *child)
static inline
struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
const char *con_id,
struct fwnode_handle *child,
enum gpiod_flags flags)
{
return ERR_PTR(-ENOSYS);
}