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gpio: Add a function to obtain a GPIO vector value

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We can use GPIOs as binary digits for reading 'strapping' values. Each GPIO
is assigned a single bit and can be set high or low on the circuit board. We
already have a legacy function for reading these values. Add one that
supports driver model.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2016-03-06 19:27:50 -07:00
committed by Bin Meng
parent 740d5d34b1
commit bbf2478026
2 changed files with 30 additions and 0 deletions
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12
include/asm-generic/gpio.h
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@ -359,6 +359,18 @@ int gpio_lookup_name(const char *name, struct udevice **devp,
*/
int gpio_get_values_as_int(const int *gpio_list);
/**
* dm_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.
*
* @desc_list: List of GPIOs to collect
* @count: Number of GPIOs
* @return resulting integer value, or -ve on error
*/
int dm_gpio_get_values_as_int(struct gpio_desc *desc_list, int count);
/**
* gpio_claim_vector() - claim a number of GPIOs for input
*