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dm: gpio: Add dm_gpio_lookup_name() to look up a GPIO name 

Provide a driver-model function to look up a GPIO name. Make the standard
function use it.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2015-06-23 15:38:40 -06:00
parent ce22c5bbee
commit 32ec159844
2 changed files with 39 additions and 8 deletions
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34
drivers/gpio/gpio-uclass.c
View File

@ -48,8 +48,7 @@ static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc)
return ret ? ret : -ENOENT;
}
int gpio_lookup_name(const char *name, struct udevice **devp,
unsigned int *offsetp, unsigned int *gpiop)
int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc)
{
struct gpio_dev_priv *uc_priv = NULL;
struct udevice *dev;
@ -57,8 +56,6 @@ int gpio_lookup_name(const char *name, struct udevice **devp,
int numeric;
int ret;
if (devp)
*devp = NULL;
numeric = isdigit(*name) ? simple_strtoul(name, NULL, 10) : -1;
for (ret = uclass_first_device(UCLASS_GPIO, &dev);
dev;
@ -84,12 +81,33 @@ int gpio_lookup_name(const char *name, struct udevice **devp,
if (!dev)
return ret ? ret : -EINVAL;
desc->dev = dev;
desc->offset = offset;
return 0;
}
int gpio_lookup_name(const char *name, struct udevice **devp,
unsigned int *offsetp, unsigned int *gpiop)
{
struct gpio_desc desc;
int ret;
if (devp)
*devp = dev;
*devp = NULL;
ret = dm_gpio_lookup_name(name, &desc);
if (ret)
return ret;
if (devp)
*devp = desc.dev;
if (offsetp)
*offsetp = offset;
if (gpiop)
*gpiop = uc_priv->gpio_base + offset;
*offsetp = desc.offset;
if (gpiop) {
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(desc.dev);
*gpiop = uc_priv->gpio_base + desc.offset;
}
return 0;
}

13
include/asm-generic/gpio.h
View File

@ -321,6 +321,19 @@ struct gpio_dev_priv {
*/
const char *gpio_get_bank_info(struct udevice *dev, int *offset_count);
/**
* dm_gpio_lookup_name() - Look up a named GPIO and return its description
*
* The name of a GPIO is typically its bank name followed by a number from 0.
* For example A0 is the first GPIO in bank A. Each bank is a separate driver
* model device.
*
* @name: Name to look up
* @desc: Returns description, on success
* @return 0 if OK, -ve on error
*/
int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc);
/**
* gpio_lookup_name - Look up a GPIO name and return its details
*