Re: [PATCH 2/9] arm64: dts: qcom: arduino-imola: Describe boot1 NVMEM layout

[Krzysztof Kozlowski <krzk@kernel.org>]

On Tue, Apr 28, 2026 at 04:23:07PM +0200, Loic Poulain wrote:
> On Arduino Uno-Q, the eMMC boot1 partition is factory provisioned
> with device-specific information such as the WiFi MAC address
> and the Bluetooth BD address. This partition can serve as an
> alternative to additional non-volatile memory, such as a
> dedicated EEPROM.
> 
> The eMMC boot partitions are typically good candidates, as they
> are realively small, read-only by default (and can be enforced
> as hardware read-only), and are not affected by board reflashing
> procedures, which generally target the eMMC user or GP partitions.
> 
> Describe the corresponding nvmem-layout for the WiFi and
> Bluetooth addresses.
> 
> Signed-off-by: Loic Poulain <loic.poulain@oss.qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts | 24 ++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts b/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts
> index bf088fa9807f040f0c8f405f9111b01790b09377..dc85cf94f71cac8666cab30ccf37cc2d2f8fd941 100644
> --- a/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts
> +++ b/arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts
> @@ -409,7 +409,31 @@ &sdhc_1 {
>  	no-sdio;
>  	no-sd;
>  
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
>  	status = "okay";
> +
> +	card@0 {
> +		compatible = "mmc-card";
> +		reg = <0>;

> +
> +		partitions-boot1 {
> +			nvmem-layout {

This should not be a separate patch. You add the layout AND you use it.

> +				compatible = "fixed-layout";
> +				#address-cells = <1>;
> +				#size-cells = <1>;
> +
> +				wifi_mac_addr: mac-addr@4400 {
> +					reg = <0x4400 0x6>;
> +				};
> +
> +				bd_addr: bd-addr@5400 {
> +					reg = <0x5400 0x6>;
> +				};
> +			};
> +		};
> +	};
>  };
>  
>  &spi5 {
> 
> -- 
> 2.34.1
>