| From: |
| Gregor Herburger <gregor.herburger-AT-linutronix.de> |
| To: |
| Rob Herring <robh-AT-kernel.org>, Krzysztof Kozlowski <krzk+dt-AT-kernel.org>, Conor Dooley <conor+dt-AT-kernel.org>, Florian Fainelli <florian.fainelli-AT-broadcom.com>, Ray Jui <rjui-AT-broadcom.com>, Scott Branden <sbranden-AT-broadcom.com>, Broadcom internal kernel review list <bcm-kernel-feedback-list-AT-broadcom.com>, Eric Anholt <eric-AT-anholt.net>, Stefan Wahren <wahrenst-AT-gmx.net>, Srinivas Kandagatla <srini-AT-kernel.org>, Kees Cook <kees-AT-kernel.org>, "Gustavo A. R. Silva" <gustavoars-AT-kernel.org>, Thomas Weißschuh <thomas.weissschuh-AT-linutronix.de> |
| Subject: |
| [PATCH v5 0/8] nvmem: Add Raspberry Pi OTP nvmem driver |
| Date: |
| Wed, 20 May 2026 16:27:52 +0200 |
| Message-ID: |
| <20260520-rpi-otp-driver-v5-0-b26e5908eeac@linutronix.de> |
| Cc: |
| devicetree-AT-vger.kernel.org, linux-rpi-kernel-AT-lists.infradead.org, linux-arm-kernel-AT-lists.infradead.org, linux-kernel-AT-vger.kernel.org, linux-hardening-AT-vger.kernel.org, Gregor Herburger <gregor.herburger-AT-linutronix.de>, Conor Dooley <conor.dooley-AT-microchip.com> |
| Archive-link: |
| Article |
Hi,
This series adds support for the Raspberry Pis OTP registers. The
Raspberry Pi has one or more OTP regions. These registers are accessible
through the firmware. Add a driver for it and add updates the devicetree
for the Raspberry Pi 5.
---
Changes in v5:
- Move alignment check to nvmem core
- Use IS_REACHABLE to simplify Kconfig
- use root_only for private driver
- Add driver as module to arch64 defconfig
- Use MODULE_DEVICE_TABLE
- Remove some unused attributes, fix typos, minor fixups
- Link to v4: https://patch.msgid.link/20260508-rpi-otp-driver-v4-0-cf8...
Changes in v4:
- Additional patch to drop unnecessary select schema
- fix dt-bindings
- use __counted_by_le
- additional alignment check in read/write callbacks
- Link to v3: https://patch.msgid.link/20260506-rpi-otp-driver-v3-0-294...
Changes in v3:
- dts: add "raspberrypi,bcm2835-firmware" as fallback and fix dt-bindings
- Fix Kconfig depends
- Changed firmware data fields to __le32
- Add MODULE_ALIAS
- Link to v2: https://patch.msgid.link/20260505-rpi-otp-driver-v2-0-e91...
Changes in v2:
- register nvmem driver from firmware driver and drop firmware sub nodes
- Use struct_size and __counted_by for dynamic array
- Drop unneeded comment in Kconfig
- Use NVMEM_DEVID_NONE
- Use kzalloc
- Update module description
- Link to v1: https://patch.msgid.link/20260408-rpi-otp-driver-v1-0-e02...
---
Gregor Herburger (8):
soc: bcm2835: Use IS_REACHABLE for function declaration
nvmem: core: Enforce stride and alignment checks for nvmem_device functions
dt-bindings: raspberrypi,bcm2835-firmware: Add bcm2712-firmware compatible
nvmem: Add the Raspberry Pi OTP driver
firmware: raspberrypi: register nvmem driver
arm64: dts: broadcom: bcm2712: add raspberrypi,bcm2712-firmware compatible
dt-bindings: raspberrypi,bcm2835-firmware: Drop unnecessary select
arm64: defconfig: Enable the raspberrypi otp driver as module
.../arm/bcm/raspberrypi,bcm2835-firmware.yaml | 20 ++--
.../boot/dts/broadcom/bcm2712-rpi-5-b-base.dtsi | 4 +-
arch/arm64/configs/defconfig | 1 +
drivers/firmware/raspberrypi.c | 59 +++++++++-
drivers/nvmem/Kconfig | 11 ++
drivers/nvmem/Makefile | 1 +
drivers/nvmem/core.c | 12 ++
drivers/nvmem/raspberrypi-otp.c | 130 +++++++++++++++++++++
include/soc/bcm2835/raspberrypi-firmware.h | 17 ++-
9 files changed, 240 insertions(+), 15 deletions(-)
---
base-commit: f3e6330d7fe42b204af05a2dbc68b379e0ad179e
change-id: 20260408-rpi-otp-driver-75fce1dcff7d
Best regards,
--
Gregor Herburger <gregor.herburger@linutronix.de>
