linux-kernel - Re: [PATCH 02/12] arm64: dts: imx8qxp: add readonly for ocotp

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Message-ID: <aQiQiIaVH3TTVLHV@w447anl.localdomain>
Date: Mon, 3 Nov 2025 11:22:55 +0000
From: John Ernberg <john.ernberg@...ia.se>
To: Frank Li <Frank.Li@....com>
CC: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, "Sascha
 Hauer" <s.hauer@...gutronix.de>, Pengutronix Kernel Team
	<kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/12] arm64: dts: imx8qxp: add readonly for ocotp

Hi Frank,

On Wed, Oct 29, 2025 at 03:54:38PM -0400, Frank Li wrote:
> Add readonly for ocotp because i.MX8QXP only support program fuse by scu.

This is not true? The driver supports writing the fuses via the SCFW API,
and we are using this way to populate the MAC fuses.

Best regards // John Ernberg
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  arch/arm64/boot/dts/freescale/imx8qxp.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> index def6de8d579d40919e4bf7f88e119611ae4cb69a..cc82cc319159c2558400fa641570cddd3ad3083d 100644
> --- a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> @@ -234,6 +234,7 @@ ocotp: ocotp {
>  			compatible = "fsl,imx8qxp-scu-ocotp";
>  			#address-cells = <1>;
>  			#size-cells = <1>;
> +			read-only;
>  
>  			fec_mac0: mac@2c4 {
>  				reg = <0x2c4 6>;
> 
> -- 
> 2.34.1
>