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authorSimon Glass <sjg@chromium.org>2015-01-05 20:05:28 -0700
committerSimon Glass <sjg@chromium.org>2015-01-29 17:09:50 -0700
commit0dac4d51f50e9252dbc00075cf65eeba57017926 (patch)
tree2d31e477c73b0de6a3604092b02e4f5b8ef5a06b
parentae7123f876357a81fc4c393239a378f1058cad5e (diff)
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dm: gpio: Add a driver GPIO translation method
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>
-rw-r--r--drivers/gpio/gpio-uclass.c16
-rw-r--r--include/asm-generic/gpio.h29
2 files changed, 45 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index 2f3c36b..0a4d9e4 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -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;
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index a827a56..c08c963 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -171,6 +171,8 @@ int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep);
int gpio_requestf(unsigned gpio, const char *fmt, ...)
__attribute__ ((format (__printf__, 2, 3)));
+struct fdtdec_phandle_args;
+
/**
* struct struct dm_gpio_ops - Driver model GPIO operations
*
@@ -214,6 +216,33 @@ struct dm_gpio_ops {
* @return current function - GPIOF_...
*/
int (*get_function)(struct udevice *dev, unsigned offset);
+
+ /**
+ * xlate() - Translate phandle arguments into a GPIO description
+ *
+ * This function should set up the fields in desc according to the
+ * information in the arguments. The uclass will have set up:
+ *
+ * @desc->dev to @dev
+ * @desc->flags to 0
+ * @desc->offset to the value of the first argument in args, if any,
+ * otherwise -1 (which is invalid)
+ *
+ * This method is optional so if the above defaults suit it can be
+ * omitted. Typical behaviour is to set up the GPIOD_ACTIVE_LOW flag
+ * in desc->flags.
+ *
+ * Note that @dev is passed in as a parameter to follow driver model
+ * uclass conventions, even though it is already available as
+ * desc->dev.
+ *
+ * @dev: GPIO device
+ * @desc: Place to put GPIO description
+ * @args: Arguments provided in descripion
+ * @return 0 if OK, -ve on error
+ */
+ int (*xlate)(struct udevice *dev, struct gpio_desc *desc,
+ struct fdtdec_phandle_args *args);
};
/**