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gpio: Add a function to obtain a GPIO vector value 

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>
utp
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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18
drivers/gpio/gpio-uclass.c
View File

@ -577,6 +577,24 @@ int gpio_get_values_as_int(const int *gpio_list)
return vector;
}
int dm_gpio_get_values_as_int(struct gpio_desc *desc_list, int count)
{
unsigned bitmask = 1;
unsigned vector = 0;
int ret, i;
for (i = 0; i < count; i++) {
ret = dm_gpio_get_value(&desc_list[i]);
if (ret < 0)
return ret;
else if (ret)
vector |= bitmask;
bitmask <<= 1;
}
return vector;
}
static int _gpio_request_by_name_nodev(const void *blob, int node,
const char *list_name, int index,
struct gpio_desc *desc, int flags,

12
include/asm-generic/gpio.h
View File

@ -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
*