linux-kernel - [PATCH v2 0/2] Make i.MX9 OCOTP work as accessing controller

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Message-Id: <20241217-imx-ocotp-v2-0-3faa6cbff41b@nxp.com>
Date: Tue, 17 Dec 2024 16:43:35 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Peng Fan <peng.fan@....com>, Frank Li <Frank.Li@....com>
Subject: [PATCH v2 0/2] Make i.MX9 OCOTP work as accessing controller

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@....com>
---
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@nxp.com

---
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: d49bc7ced87506bedbcce1ca7782ff942b309f2d
change-id: 20241212-imx-ocotp-cbef304140f5

Best regards,
-- 
Peng Fan <peng.fan@....com>