linux-kernel - [PATCH v2 0/5] nvmem: add Samsung Exynos OTP support

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Message-Id: <20251112-gs101-otp-v2-0-bff2eb020c95@linaro.org>
Date: Wed, 12 Nov 2025 08:29:04 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Srinivas Kandagatla <srini@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski <krzk@...nel.org>, 
 Alim Akhtar <alim.akhtar@...sung.com>, 
 Peter Griffin <peter.griffin@...aro.org>, 
 André Draszik <andre.draszik@...aro.org>
Cc: semen.protsenko@...aro.org, willmcvicker@...gle.com, 
 kernel-team@...roid.com, linux-kernel@...r.kernel.org, 
 linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v2 0/5] nvmem: add Samsung Exynos OTP support

Dependency
==========
Typical dependency of the DT patch depending on the bindings patch,
thus the bindings patch could go via the Samsung SoC tree with
Srinivas's ack.

Description
===========
Add initial support for the Samsung Exynos OTP controller. Read the
product and chip IDs from the OTP controller registers space and
register the SoC info to the SoC interface.

The driver can be extended to empower the controller become nvmem
provider. This is not in the scope of this patch because it seems the
OTP memory space is not yet used by any consumer, even downstream.

Testing
=======
root@...gle-gs:~# cat /sys/devices/soc0/family
Samsung Exynos
root@...gle-gs:~# cat /sys/devices/soc0/machine
Oriole
root@...gle-gs:~# cat /sys/devices/soc0/revision
11
root@...gle-gs:~# cat /sys/devices/soc0/soc_id
GS101

Cheers,
ta

Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
Changes in v2:
- bindings:
  - drop dependency on nvmem-deprecated-cells.yaml
  - drop clock-names, otp label, child nodes
  - add interrupts prop, make it required and add it in the example
- driver:
  - no longer a nvmem provider, register just to the soc interface
  - update comment about the module name in Kconfig
- dts: add interrupts, drop child nodes, drop otp label
- Link to v1: https://lore.kernel.org/r/20251031-gs101-otp-v1-0-2a54f6c4e7b6@linaro.org

---
Tudor Ambarus (5):
      dt-bindings: nvmem: add google,gs101-otp
      nvmem: add Samsung Exynos OTP support
      arm64: dts: exynos: gs101: add OTP node
      arm64: defconfig: enable Samsung Exynos OTP controller
      MAINTAINERS: add entry for the Samsung Exynos OTP controller driver

 .../bindings/nvmem/google,gs101-otp.yaml           |  56 ++++++++
 MAINTAINERS                                        |   8 ++
 arch/arm64/boot/dts/exynos/google/gs101.dtsi       |   7 +
 arch/arm64/configs/defconfig                       |   1 +
 drivers/nvmem/Kconfig                              |  10 ++
 drivers/nvmem/Makefile                             |   2 +
 drivers/nvmem/exynos-otp.c                         | 160 +++++++++++++++++++++
 7 files changed, 244 insertions(+)
---
base-commit: 4b67e4c65c1e0740ac12bd0d790eb5a9d0091aaa
change-id: 20251031-gs101-otp-2f38e8b4b793

Best regards,
-- 
Tudor Ambarus <tudor.ambarus@...aro.org>