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dm: gpio: Add error handling and a function to claim vector GPIOs

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gpio_get_values_as_int() should return an error if something goes wrong.
Also provide gpio_claim_vector(), a function to request the GPIOs and set
them to input mode. Otherwise callers have to do this themselves.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Simon Glass
2015-04-14 21:03:20 -06:00
committed by Tom Warren
parent 3d7cf4192f
commit 962f5caf60
2 changed files with 47 additions and 6 deletions
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15
include/asm-generic/gpio.h
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@ -336,15 +336,24 @@ int gpio_lookup_name(const char *name, struct udevice **devp,
unsigned int *offsetp, unsigned int *gpiop);
/**
* get_gpios() - Turn the values of a list of GPIOs into an integer
* gpio_get_values_as_int() - Turn the values of a list of GPIOs into an int
*
* This puts the value of the first GPIO into bit 0, the second into bit 1,
* etc. then returns the resulting integer.
*
* @gpio_list: List of GPIOs to collect
* @return resulting integer value
* @return resulting integer value, or -ve on error
*/
unsigned gpio_get_values_as_int(const int *gpio_list);
int gpio_get_values_as_int(const int *gpio_list);
/**
* gpio_claim_vector() - claim a number of GPIOs for input
*
* @gpio_num_array: array of gpios to claim, terminated by -1
* @fmt: format string for GPIO names, e.g. "board_id%d"
* @return 0 if OK, -ve on error
*/
int gpio_claim_vector(const int *gpio_num_array, const char *fmt);
/**
* gpio_request_by_name() - Locate and request a GPIO by name