[PATCH v4 0/5] nvmem: Add Raspberry Pi OTP nvmem driver

[Gregor Herburger]

On Tue, May 19, 2026 at 04:55:10PM +0200, Stefan Wahren wrote:
> Hi Gregor,
> 
> Am 08.05.26 um 16:42 schrieb Gregor Herburger:
> > 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 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-v3-0-294602663695@linutronix.de
> > 
> > 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-e9176ec72837@linutronix.de
> > 
> > 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-e02d1dbe6008@linutronix.de
> > 
> > ---
> > Gregor Herburger (5):
> >        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
> > 
> >   .../arm/bcm/raspberrypi,bcm2835-firmware.yaml      |  20 ++--
> >   .../boot/dts/broadcom/bcm2712-rpi-5-b-base.dtsi    |   4 +-
> >   drivers/firmware/raspberrypi.c                     |  59 +++++++++-
> >   drivers/nvmem/Kconfig                              |  10 ++
> >   drivers/nvmem/Makefile                             |   1 +
> >   drivers/nvmem/raspberrypi-otp.c                    | 130 +++++++++++++++++++++
> >   include/soc/bcm2835/raspberrypi-firmware.h         |  14 +++
> >   7 files changed, 224 insertions(+), 14 deletions(-)
> since you plan to submit a V5 of this series, could you please append
> another patch to enable the driver as module for arm64/defconfig?

Good Idea, will add it.

Gregor