drivers: gpio: Add a managed API to get a GPIO from the device-tree
Add managed functions to get a gpio from the devce-tree, based on a
property name (minus the '-gpios' suffix) and optionally an index.
When the device is unbound, the GPIO is automatically released and the
data structure is freed.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index 9c53299..0c01413 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -6,6 +6,8 @@
#include <common.h>
#include <dm.h>
#include <log.h>
+#include <dm/devres.h>
+#include <dm/device_compat.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/uclass-internal.h>
@@ -1209,6 +1211,75 @@
flags, 0, dev);
}
+static void devm_gpiod_release(struct udevice *dev, void *res)
+{
+ dm_gpio_free(dev, res);
+}
+
+static int devm_gpiod_match(struct udevice *dev, void *res, void *data)
+{
+ return res == data;
+}
+
+struct gpio_desc *devm_gpiod_get_index(struct udevice *dev, const char *id,
+ unsigned int index, int flags)
+{
+ int rc;
+ struct gpio_desc *desc;
+ char *propname;
+ static const char suffix[] = "-gpios";
+
+ propname = malloc(strlen(id) + sizeof(suffix));
+ if (!propname) {
+ rc = -ENOMEM;
+ goto end;
+ }
+
+ strcpy(propname, id);
+ strcat(propname, suffix);
+
+ desc = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc),
+ __GFP_ZERO);
+ if (unlikely(!desc)) {
+ rc = -ENOMEM;
+ goto end;
+ }
+
+ rc = gpio_request_by_name(dev, propname, index, desc, flags);
+
+end:
+ if (propname)
+ free(propname);
+
+ if (rc)
+ return ERR_PTR(rc);
+
+ devres_add(dev, desc);
+
+ return desc;
+}
+
+struct gpio_desc *devm_gpiod_get_index_optional(struct udevice *dev,
+ const char *id,
+ unsigned int index,
+ int flags)
+{
+ struct gpio_desc *desc = devm_gpiod_get_index(dev, id, index, flags);
+
+ if (IS_ERR(desc))
+ return NULL;
+
+ return desc;
+}
+
+void devm_gpiod_put(struct udevice *dev, struct gpio_desc *desc)
+{
+ int rc;
+
+ rc = devres_release(dev, devm_gpiod_release, devm_gpiod_match, desc);
+ WARN_ON(rc);
+}
+
static int gpio_post_bind(struct udevice *dev)
{
struct udevice *child;