[U-Boot] [PATCH 1/3] gpio: omap_gpio: Add xlate function to support GPIO_ACTIVE_LOW

[Adam Ford]

The gpio driver doesn't current support knowing whether or not
GPIO is active low or high.  It simply returns the value.  The
side effect of this, is that the MMC routines which check
the status card detect or write protect must use a u-boot specific
dts modification to enable inverting the pin values when
GPIO_ACTIVE_LOW is used.  This allows the invert option to be removed

Signed-off-by: Adam Ford <aford173 at gmail.com>

diff --git a/drivers/gpio/omap_gpio.c b/drivers/gpio/omap_gpio.c
index 555eba2662..0ecd2f374a 100644
--- a/drivers/gpio/omap_gpio.c
+++ b/drivers/gpio/omap_gpio.c
@@ -24,6 +24,7 @@
 #include <asm/io.h>
 #include <linux/errno.h>
 #include <malloc.h>
+#include <dt-bindings/gpio/gpio.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -275,12 +276,25 @@ static int omap_gpio_get_function(struct udevice *dev, unsigned offset)
 		return GPIOF_INPUT;
 }
 
+static int omap_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
+			   struct ofnode_phandle_args *args)
+{
+	desc->offset = args->args[0];
+
+	if (args->args[1] & GPIO_ACTIVE_LOW)
+		desc->flags = GPIOD_ACTIVE_LOW;
+	else
+		desc->flags = 0;
+	return 0;
+}
+
 static const struct dm_gpio_ops gpio_omap_ops = {
 	.direction_input	= omap_gpio_direction_input,
 	.direction_output	= omap_gpio_direction_output,
 	.get_value		= omap_gpio_get_value,
 	.set_value		= omap_gpio_set_value,
 	.get_function		= omap_gpio_get_function,
+	.xlate                  = omap_gpio_xlate,
 };
 
 static int omap_gpio_probe(struct udevice *dev)
-- 
2.17.1