diff options
| author | Simon Glass <sjg@chromium.org> | 2016-03-06 19:27:50 -0700 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2016-03-17 10:27:22 +0800 |
| commit | bbf2478026c0addfff000f31cc1b5639cbff52cb (patch) | |
| tree | 58db941696e2d4153370d1b25c11579a89dc8dd3 /drivers/gpio | |
| parent | 740d5d34b12f49b5e6c48e06dd8f519d9563a7e3 (diff) | |
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>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-uclass.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c index d603b559027..b2a2ca85cd5 100644 --- a/drivers/gpio/gpio-uclass.c +++ b/drivers/gpio/gpio-uclass.c @@ -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, |