of_clk_del_provider(*(struct device_node **)res);
}
+/*
+ * We allow a child device to use its parent device as the clock provider node
+ * for cases like MFD sub-devices where the child device driver wants to use
+ * devm_*() APIs but not list the device in DT as a sub-node.
+ */
+static struct device_node *get_clk_provider_node(struct device *dev)
+{
+ struct device_node *np, *parent_np;
+
+ np = dev->of_node;
+ parent_np = dev->parent ? dev->parent->of_node : NULL;
+
+ if (!of_find_property(np, "#clock-cells", NULL))
+ if (of_find_property(parent_np, "#clock-cells", NULL))
+ np = parent_np;
+
+ return np;
+}
+
/**
* devm_of_clk_add_hw_provider() - Managed clk provider node registration
* @dev: Device acting as the clock provider (used for DT node and lifetime)
* @get: callback for decoding clk_hw
* @data: context pointer for @get callback
*
- * Registers clock provider for given device's node. Provider is automatically
- * released at device exit.
+ * Registers clock provider for given device's node. If the device has no DT
+ * node or if the device node lacks of clock provider information (#clock-cells)
+ * then the parent device's node is scanned for this information. If parent node
+ * has the #clock-cells then it is used in registration. Provider is
+ * automatically released at device exit.
*
* Return: 0 on success or an errno on failure.
*/
if (!ptr)
return -ENOMEM;
- np = dev->of_node;
+ np = get_clk_provider_node(dev);
ret = of_clk_add_hw_provider(np, get, data);
if (!ret) {
*ptr = np;
void devm_of_clk_del_provider(struct device *dev)
{
int ret;
+ struct device_node *np = get_clk_provider_node(dev);
ret = devres_release(dev, devm_of_clk_release_provider,
- devm_clk_provider_match, dev->of_node);
+ devm_clk_provider_match, np);
WARN_ON(ret);
}