On Mon, Aug 18, 2025 at 07:44:40PM +0200, Marco Felsch wrote:
> Linux has added the support to expose nvmem-cells via the sysfs by
> commit 0331c611949f ("nvmem: core: Expose cells through sysfs"). This
> commit adds an equivalent mechanism by exposing the nvmem-cells via
> cdevs. The name scheme is: <nvmem-dev-name>.<cell-name>.
>
> With this in place it is possible for board code and/or shell to query
> the nvmem-cell values without specifying the consumer API within DT. At
> the moment the access is RO like Linux does since write support requires
> more corner case handling.
>
> The naming scheme for nvmem_populate_sysfs_cells() was kept to reduce the
> Linux diff.
>
> Signed-off-by: Marco Felsch <m.fel...@pengutronix.de>
> ---
> drivers/nvmem/core.c | 93
> ++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 93 insertions(+)
>
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index
> c252f17ef0b24e8199e199db086aeec8d09fdf94..4dbeb1e116ae398f1f2748238d97468c1096262a
> 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -45,6 +45,8 @@ struct nvmem_cell_entry {
> struct device_node *np;
> struct nvmem_device *nvmem;
> struct list_head node;
> +
> + struct cdev cdev;
> };
>
> struct nvmem_cell {
> @@ -167,6 +169,71 @@ static struct nvmem_device *of_nvmem_find(struct
> device_node *nvmem_np)
> return NULL;
> }
>
> +static struct nvmem_cell *nvmem_create_cell(struct nvmem_cell_entry *entry,
> + const char *id, int index);
This causes intermediate breakage. The prototype at this point is still:
static struct nvmem_cell *nvmem_create_cell(struct nvmem_cell_entry *entry,
const char *id);
The index parameter is only added later in this series.
Sascha
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