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dm: tegra: Add a GPIO translation function

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This deals with the polarity bit and selecting the correct bank device
given a GPIO number.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2015-01-05 20:05:33 -07:00
parent 32f8a19f6d
commit 838aa5c94a
1 changed files with 18 additions and 0 deletions
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18
drivers/gpio/tegra_gpio.c
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@ -21,6 +21,7 @@
#include <asm/arch/tegra.h>
#include <asm/gpio.h>
#include <dm/device-internal.h>
#include <dt-bindings/gpio/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
@ -251,6 +252,22 @@ static int tegra_gpio_get_function(struct udevice *dev, unsigned offset)
return GPIOF_INPUT;
}
static int tegra_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
struct fdtdec_phandle_args *args)
{
int gpio, port, ret;
gpio = args->args[0];
port = gpio / TEGRA_GPIOS_PER_PORT;
ret = device_get_child(dev, port, &desc->dev);
if (ret)
return ret;
desc->offset = gpio % TEGRA_GPIOS_PER_PORT;
desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
return 0;
}
static const struct dm_gpio_ops gpio_tegra_ops = {
.request = tegra_gpio_request,
.direction_input = tegra_gpio_direction_input,
@ -258,6 +275,7 @@ static const struct dm_gpio_ops gpio_tegra_ops = {
.get_value = tegra_gpio_get_value,
.set_value = tegra_gpio_set_value,
.get_function = tegra_gpio_get_function,
.xlate = tegra_gpio_xlate,
};
/**