dm: tegra: Add a GPIO translation function

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

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/gpio/tegra_gpio.c b/drivers/gpio/tegra_gpio.c
index 88f7ef5bf04d9abce9605cd7e8e161a11b135a8d..43928b8812c3aad0077b8beb4a837993c653ed59 100644 (file)
--- a/drivers/gpio/tegra_gpio.c
+++ b/drivers/gpio/tegra_gpio.c
@@ -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,
 };
 
 /**