Adding a resource managed method to obtain nvmem cell
using cell index.
Signed-off-by: Vivek Gautam <vivek.gautam@xxxxxxxxxxxxxx>
---
drivers/nvmem/core.c | 33 +++++++++++++++++++++++++++++++++
include/linux/nvmem-consumer.h | 8 ++++++++
2 files changed, 41 insertions(+)
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index f46b8f667571..3d0eca689931 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -907,6 +907,39 @@ struct nvmem_cell *devm_nvmem_cell_get(struct device *dev, const char *id)
}
EXPORT_SYMBOL_GPL(devm_nvmem_cell_get);
+#if IS_ENABLED(CONFIG_NVMEM) && IS_ENABLED(CONFIG_OF)
+/**
+ * devm_nvmem_cell_get_by_index() - Get nvmem cell of device from cell index;
+ * resource managed.
+ *
+ * @dev node: Device tree node that uses the nvmem cell
+ * @index: index of nvmem cell
+ *
+ * Return: Will be an ERR_PTR() on error or a valid pointer
+ * to a struct nvmem_cell. The nvmem_cell will be freed by the
+ * automatically once the device is freed.
+ */
+struct nvmem_cell *devm_nvmem_cell_get_by_index(struct device *dev, int index)
+{
+ struct nvmem_cell **ptr, *cell;
+
+ ptr = devres_alloc(devm_nvmem_cell_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ cell = of_nvmem_cell_get_by_index(dev->of_node, index);
+ if (!IS_ERR(cell)) {
+ *ptr = cell;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return cell;
+}
+EXPORT_SYMBOL_GPL(devm_nvmem_cell_get_by_index);
+#endif
+
static int devm_nvmem_cell_match(struct device *dev, void *res, void *data)
{
struct nvmem_cell **c = res;
diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index 0dd9ef837a32..065647b5143e 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -142,6 +142,8 @@ struct nvmem_cell *of_nvmem_cell_get_by_index(struct device_node *np,
int index);
struct nvmem_device *of_nvmem_device_get(struct device_node *np,
const char *name);
+struct nvmem_cell *devm_nvmem_cell_get_by_index(struct device *dev,
+ int index);
#else
static inline
struct nvmem_cell *of_nvmem_cell_get_by_index(struct device_node *np,
@@ -161,6 +163,12 @@ static inline struct nvmem_device *of_nvmem_device_get(struct device_node *np,
{
return ERR_PTR(-ENOSYS);
}
+
+static inline
+struct nvmem_cell *devm_nvmem_cell_get_by_index(struct device *dev, int index)
+{
+ return ERR_PTR(-ENOSYS);
+}
#endif /* CONFIG_NVMEM && CONFIG_OF */
#endif /* ifndef _LINUX_NVMEM_CONSUMER_H */
--
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