reset: Add of_reset_control_get
In some cases, you might need to deassert from reset an hardware block that
doesn't associated to a struct device (CPUs, timers, etc.).
Add a small helper to retrieve the reset controller from the device tree
without the need to pass a struct device.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 217d2fa..baeaf82 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -126,15 +126,16 @@
EXPORT_SYMBOL_GPL(reset_control_deassert);
/**
- * reset_control_get - Lookup and obtain a reference to a reset controller.
- * @dev: device to be reset by the controller
+ * of_reset_control_get - Lookup and obtain a reference to a reset controller.
+ * @node: device to be reset by the controller
* @id: reset line name
*
* Returns a struct reset_control or IS_ERR() condition containing errno.
*
* Use of id names is optional.
*/
-struct reset_control *reset_control_get(struct device *dev, const char *id)
+struct reset_control *of_reset_control_get(struct device_node *node,
+ const char *id)
{
struct reset_control *rstc = ERR_PTR(-EPROBE_DEFER);
struct reset_controller_dev *r, *rcdev;
@@ -143,13 +144,10 @@
int rstc_id;
int ret;
- if (!dev)
- return ERR_PTR(-EINVAL);
-
if (id)
- index = of_property_match_string(dev->of_node,
+ index = of_property_match_string(node,
"reset-names", id);
- ret = of_parse_phandle_with_args(dev->of_node, "resets", "#reset-cells",
+ ret = of_parse_phandle_with_args(node, "resets", "#reset-cells",
index, &args);
if (ret)
return ERR_PTR(ret);
@@ -184,12 +182,35 @@
return ERR_PTR(-ENOMEM);
}
- rstc->dev = dev;
rstc->rcdev = rcdev;
rstc->id = rstc_id;
return rstc;
}
+EXPORT_SYMBOL_GPL(of_reset_control_get);
+
+/**
+ * reset_control_get - Lookup and obtain a reference to a reset controller.
+ * @dev: device to be reset by the controller
+ * @id: reset line name
+ *
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ *
+ * Use of id names is optional.
+ */
+struct reset_control *reset_control_get(struct device *dev, const char *id)
+{
+ struct reset_control *rstc;
+
+ if (!dev)
+ return ERR_PTR(-EINVAL);
+
+ rstc = of_reset_control_get(dev->of_node, id);
+ if (!IS_ERR(rstc))
+ rstc->dev = dev;
+
+ return rstc;
+}
EXPORT_SYMBOL_GPL(reset_control_get);
/**