[PATCH 3/9] firmware: imx: ele: Add API functions for OCOTP fuse access

[Frank Li]

On Tue, Jun 16, 2026 at 07:59:54PM +0200, Frieder Schrempf wrote:
> On 16.06.26 17:36, Frank Li wrote:
> > On Tue, Jun 16, 2026 at 01:52:18PM +0200, Frieder Schrempf wrote:
> >> From: Frieder Schrempf <frieder.schrempf at kontron.de>
> >>
> >> The ELE S400 API provides read and write access to the OCOTP fuse
> >> registers. This adds the necessary API functions imx_se_read_fuse()
> >> and imx_se_write_fuse() to be used by other drivers such as the
> >> OCOTP S400 NVMEM driver.
> >>
> >> This is ported from the downstream vendor kernel.
> >>
> >> Signed-off-by: Frieder Schrempf <frieder.schrempf at kontron.de>
> >> ---
> >>  drivers/firmware/imx/ele_base_msg.c | 122 ++++++++++++++++++++++++++++++++++++
> >>  drivers/firmware/imx/ele_base_msg.h |   6 ++
> >>  include/linux/firmware/imx/se_api.h |   3 +
> >>  3 files changed, 131 insertions(+)
> >>
> > ...
> >> +++ b/include/linux/firmware/imx/se_api.h
> >> @@ -11,4 +11,7 @@
> >>  #define SOC_ID_OF_IMX8ULP		0x084d
> >>  #define SOC_ID_OF_IMX93			0x9300
> >>
> >> +int imx_se_read_fuse(void *se_if_data, uint16_t fuse_id, u32 *value);
> >> +int imx_se_write_fuse(void *se_if_data, uint16_t fuse_id, u32 value);
> >> +
> >
> > This API should implement in fuse drivers. Other consume should use standard
> > fuse API to get value. If put here, it may bypass fuse driver.
>
> The reason this is here, is the downstream implementation in linux-imx
> and the current code organization.

Downstream may not good enough, sometime, it is quick solution.

> I thought there is some good reason
> to have shared functions and it looks like Pankaj structured it like
> this so all API functions live in ele_base_msg.c and the internal
> structs and defines in ele_base_msg.h and se_ctrl.h are not exposed to
> other drivers.
>
> If I would move this into imx-ocotp-ele.c, then I would also need to
> change how the code is organized and make the internal se_api functions
> exposed to other drivers. I don't know if that is really a good idea.
>
> I get your point but it looks like this contradicts the intention of
> having a clean API in the firmware driver.

You can refer imx-ocotp-scu.c, structure should be similar, only difference
is that lower transfer APIs.

Frank