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dm: gpio: Add a driver GPIO translation method

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Only the GPIO driver knows about the full GPIO device tree binding used by
a device. Add a method to allow the driver to provide this information to the
uclass, including the GPIO offset within the device and flags such as the
polarity.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2015-01-05 20:05:28 -07:00
parent ae7123f876
commit 0dac4d51f5
2 changed files with 45 additions and 0 deletions
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16
drivers/gpio/gpio-uclass.c
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@@ -7,6 +7,7 @@
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <asm/gpio.h>
#include <linux/ctype.h>
@@ -91,6 +92,21 @@ int gpio_lookup_name(const char *name, struct udevice **devp,
return 0;
}
int gpio_find_and_xlate(struct gpio_desc *desc,
struct fdtdec_phandle_args *args)
{
struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
/* Use the first argument as the offset by default */
if (args->args_count > 0)
desc->offset = args->args[0];
else
desc->offset = -1;
desc->flags = 0;
return ops->xlate ? ops->xlate(desc->dev, desc, args) : 0;
}
static int dm_gpio_request(struct gpio_desc *desc, const char *label)
{
struct udevice *dev = desc->dev;