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dm: gpio: Enhance gpio command to show only active GPIOs

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The GPIO list is very long in many cases and most of them are not used.
By default, show only the GPIOs that are in use, and provide a flag to show
all of them. This makes the 'gpio status' command much more pleasant.

In order to do this, driver model now exposes a method for obtaining the
'function' of a GPIO, which describes whether it is an input or output, for
example. Implementation of this method is optional.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2014-08-11 09:23:52 -06:00
parent a1263632bb
commit 89e6405425
2 changed files with 82 additions and 34 deletions
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15
include/asm-generic/gpio.h
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@ -79,11 +79,15 @@ int gpio_get_value(unsigned gpio);
*/
int gpio_set_value(unsigned gpio, int value);
/* State of a GPIO, as reported by get_state() */
/* State of a GPIO, as reported by get_function() */
enum {
GPIOF_INPUT = 0,
GPIOF_OUTPUT,
GPIOF_UNKNOWN,
GPIOF_UNUSED, /* Not claimed */
GPIOF_UNKNOWN, /* Not known */
GPIOF_FUNC, /* Not used as a GPIO */
GPIOF_COUNT,
};
struct udevice;
@ -123,6 +127,13 @@ struct dm_gpio_ops {
int value);
int (*get_value)(struct udevice *dev, unsigned offset);
int (*set_value)(struct udevice *dev, unsigned offset, int value);
/**
* get_function() Get the GPIO function
*
* @dev: Device to check
* @offset: GPIO offset within that device
* @return current function - GPIOF_...
*/
int (*get_function)(struct udevice *dev, unsigned offset);
int (*get_state)(struct udevice *dev, unsigned offset, char *state,
int maxlen);