[PATCH 2/3] nvmem: Add the Raspberry Pi OTP driver

[Krzysztof Kozlowski]

On Wed, Apr 08, 2026 at 10:00:16AM +0200, Gregor Herburger wrote:
> Raspberry Pis have OTP registers which can be accessed through the
> videocore firmware. Add a nvmem driver to support these OTP registers.
> 
> Signed-off-by: Gregor Herburger <gregor.herburger at linutronix.de>
> ---
>  drivers/nvmem/Kconfig                      |  12 +++
>  drivers/nvmem/Makefile                     |   1 +
>  drivers/nvmem/raspberrypi-otp.c            | 159 +++++++++++++++++++++++++++++
>  include/soc/bcm2835/raspberrypi-firmware.h |   2 +
>  4 files changed, 174 insertions(+)
> 
> diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
> index 74ddbd0f79b0..892d05fe67be 100644
> --- a/drivers/nvmem/Kconfig
> +++ b/drivers/nvmem/Kconfig
> @@ -483,4 +483,16 @@ config NVMEM_QORIQ_EFUSE
>  	  This driver can also be built as a module. If so, the module
>  	  will be called nvmem_qoriq_efuse.
>  
> +config NVMEM_RASPBERRYPI_OTP
> +	tristate "Raspberry Pi OTP support"
> +	# Make sure not 'y' when RASPBERRYPI_FIRMWARE is 'm'. This can only
> +	# happen when COMPILE_TEST=y, hence the added !RASPBERRYPI_FIRMWARE.

Drop comment and use standard rules for multiple modules.

https://lwn.net/Articles/944368/

Best regards,
Krzysztof