nvmem: core: Fix of_nvmem_cell_get() for optional cells

of_nvmem_cell_get() should return -ENOENT when a cell isn't defined,
otherwise callers can't distinguish between a missing cell and other
errors.

Signed-off-by: Alban Bedel <albeu@free.fr>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index cf2e109..f8c43da 100644 (file)
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -1031,7 +1031,7 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id)
 
        cell_np = of_parse_phandle(np, "nvmem-cells", index);
        if (!cell_np)
-               return ERR_PTR(-EINVAL);
+               return ERR_PTR(-ENOENT);
 
        nvmem_np = of_get_next_parent(cell_np);
        if (!nvmem_np)