diff options
| author | Simon Glass <sjg@chromium.org> | 2015-01-05 20:05:29 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-01-29 17:09:51 -0700 |
| commit | 3669e0e759118fed3d371e2427b4b47d3969bfd0 (patch) | |
| tree | 2f9831f33ac579dda2719ce5cc8bcbcd75c96f24 /drivers/gpio/sandbox.c | |
| parent | 0dac4d51f50e9252dbc00075cf65eeba57017926 (diff) | |
dm: gpio: Add better functions to request GPIOs
At present U-Boot sort-of supports the standard way of reading GPIOs from
device tree nodes, but the support is incomplete, a bit clunky and only
works for GPIO bindings where #gpio-cells is 2.
Add new functions to request GPIOs, taking full account of the device
tree binding. These permit requesting a GPIO with a simple call like:
gpio_request_by_name(dev, "cd-gpios", 0, &desc, GPIOD_IS_IN);
This will request the GPIO, looking at the device's node which might be
this, for example:
cd-gpios = <&gpio TEGRA_GPIO(B, 3) GPIO_ACTIVE_LOW>;
The GPIO will be set to input mode in this case and polarity will be
honoured by the GPIO calls.
It is also possible to request and free a list of GPIOs.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/gpio/sandbox.c')
| -rw-r--r-- | drivers/gpio/sandbox.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpio/sandbox.c b/drivers/gpio/sandbox.c index 53c80d5be6..d564c252c7 100644 --- a/drivers/gpio/sandbox.c +++ b/drivers/gpio/sandbox.c @@ -8,6 +8,7 @@ #include <fdtdec.h> #include <malloc.h> #include <asm/gpio.h> +#include <dt-bindings/gpio/gpio.h> DECLARE_GLOBAL_DATA_PTR; @@ -130,12 +131,31 @@ static int sb_gpio_get_function(struct udevice *dev, unsigned offset) return GPIOF_INPUT; } +static int sb_gpio_xlate(struct udevice *dev, struct gpio_desc *desc, + struct fdtdec_phandle_args *args) +{ + desc->offset = args->args[0]; + if (args->args_count < 2) + return 0; + if (args->args[1] & GPIO_ACTIVE_LOW) + desc->flags |= GPIOD_ACTIVE_LOW; + if (args->args[1] & 2) + desc->flags |= GPIOD_IS_IN; + if (args->args[1] & 4) + desc->flags |= GPIOD_IS_OUT; + if (args->args[1] & 8) + desc->flags |= GPIOD_IS_OUT_ACTIVE; + + return 0; +} + static const struct dm_gpio_ops gpio_sandbox_ops = { .direction_input = sb_gpio_direction_input, .direction_output = sb_gpio_direction_output, .get_value = sb_gpio_get_value, .set_value = sb_gpio_set_value, .get_function = sb_gpio_get_function, + .xlate = sb_gpio_xlate, }; static int sandbox_gpio_ofdata_to_platdata(struct udevice *dev) |