Hi Srinivas, Is this patchset good for you to pick up? Thanks, Peng On Mon, Dec 23, 2024 at 08:46:12AM +0800, Peng Fan (OSS) wrote: >Previously there was discussion on using "feature-controller" or >adding a specific node to group the fuse information for U-Boot to >parse and update node. But rejected by DT maintainer(Rob). > >Since the STM32 engineers added access controller concept and landed >the support in Linux Kernel, reuse the concept for i.MX. > >i.MX OCOTP eFuse has some bits to indicate a specific periphral or >function is avaiable for current chip, for example i.MX93 has variants >that not have NPU. So introduce '#access-controller-cells' for OCOTP, >and add "#access-controllers = <&ocotp [gate_index]>" for periphrals >that needs accessing control checking. > >In OCOTP driver, the nodes under "/" will be iterated, and checked >if property "#access-controllers" exsits. If not allow access, detach >the node. > >In the end, cpu nodes should still be handled by bootloader. >And I may also update i.MX8M to use same method to support variants >if this patchset is good. > >Signed-off-by: Peng Fan <peng.fan@xxxxxxx> >--- >Changes in v4: >- Add missing of_node_put(provider) >- Typo fix in commit log >- Link to v3: https://lore.kernel.org/r/20241219-imx-ocotp-v3-0-b22371098071@xxxxxxx > >Changes in v3: >- Add A-b for patch 1 >- Use scoped API when iterate nodes and address build warning in patch 2 >- I am also thinking that to drop patch 2 to let > bootloader to iterate the nodes that have access-controllers property and > update the nodes before booting the kernel. Then just need patch 1 for > the binding updates. Anyway, comments are welcomed. >- Link to v2: https://lore.kernel.org/r/20241217-imx-ocotp-v2-0-3faa6cbff41b@xxxxxxx > >Changes in v2: >- Add R-b for patch 1 >- Use '/' root node instead of '/soc' or '/soc@0' for patch 2 >- Link to v1: https://lore.kernel.org/r/20241212-imx-ocotp-v1-0-198bb0af86a0@xxxxxxx > >--- >Peng Fan (2): > dt-bindings: nvmem: imx-ocotp: Introduce #access-controller-cells > nvmem: imx-ocotp-ele: Support accessing controller for i.MX9 > > .../devicetree/bindings/nvmem/imx-ocotp.yaml | 5 + > drivers/nvmem/imx-ocotp-ele.c | 184 ++++++++++++++++++++- > include/dt-bindings/nvmem/fsl,imx93-ocotp.h | 24 +++ > include/dt-bindings/nvmem/fsl,imx95-ocotp.h | 43 +++++ > 4 files changed, 255 insertions(+), 1 deletion(-) >--- >base-commit: 6d13015b67d58ddba56631c56e0a6f376ade0867 >change-id: 20241212-imx-ocotp-cbef304140f5 > >Best regards, >-- >Peng Fan <peng.fan@xxxxxxx> >
