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authorVivek Gautam <vivek.gautam@codeaurora.org>2017-01-22 23:02:40 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-25 11:49:39 +0100
commitfd0c478c0dd800449e2d70025ef742679a16a8de (patch)
treee86523b9f86717ce44f515b7ed434646eeebd985 /drivers/nvmem
parent29143268ec7d292ae4531bdf8deb6e55239a0051 (diff)
nvmem: core: Allow getting nvmem cell with a NULL cell id
The nvmem cell with a NULL cell name/id should be the one with no accompanying 'nvmem-cell-names' property, and thus will be the cell at index 0 in the device tree. So, we default to index 0 and update the cell index only when nvmem cell name id exists. Suggested-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/core.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 9c0592127d7e..408b521ee520 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -747,7 +747,9 @@ static struct nvmem_cell *nvmem_cell_get_from_list(const char *cell_id)
* of_nvmem_cell_get() - Get a nvmem cell from given device node and cell id
*
* @np: Device tree node that uses the nvmem cell.
- * @name: nvmem cell name from nvmem-cell-names property.
+ * @name: nvmem cell name from nvmem-cell-names property, or NULL
+ * for the cell at index 0 (the lone cell with no accompanying
+ * nvmem-cell-names property).
*
* 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
@@ -760,9 +762,12 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
struct nvmem_cell *cell;
struct nvmem_device *nvmem;
const __be32 *addr;
- int rval, len, index;
+ int rval, len;
+ int index = 0;
- index = of_property_match_string(np, "nvmem-cell-names", name);
+ /* if cell name exists, find index to the name */
+ if (name)
+ index = of_property_match_string(np, "nvmem-cell-names", name);
cell_np = of_parse_phandle(np, "nvmem-cells", index);
if (!cell_np)

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