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dm: gpio: Add a function to read an ID from a list of GPIOs

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For board IDs a common approach is to set aside several GPIOs for use in
determining the board ID. This can provide information about board features
and the revision.

Add a function that turns a list of GPIOs into an integer by assigning
each GPIO to a single bit.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2014-11-10 18:00:21 -07:00
parent 469a579df2
commit e5901c94e3
2 changed files with 29 additions and 1 deletions
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11
include/asm-generic/gpio.h
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@ -257,6 +257,15 @@ const char *gpio_get_bank_info(struct udevice *dev, int *offset_count);
int gpio_lookup_name(const char *name, struct udevice **devp,
unsigned int *offsetp, unsigned int *gpiop);
int name_to_gpio(const char *name);
/**
* get_gpios() - Turn the values of a list of GPIOs into an integer
*
* 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
*/
unsigned gpio_get_values_as_int(const int *gpio_list);
#endif /* _ASM_GENERIC_GPIO_H_ */