linux-kernel - Re: [PATCH v2 3/4] powerpc: wii.dts: Expose the OTP on this platform

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Date:   Sat, 26 Jun 2021 23:34:01 +0000
From:   Jonathan Neuschäfer <j.ne@...teo.net>
To:     Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org,
        Ash Logan <ash@...quark.com>,
        Jonathan Neuschäfer <j.ne@...teo.net>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] powerpc: wii.dts: Expose the OTP on this platform

On Wed, May 19, 2021 at 11:50:43AM +0200, Emmanuel Gil Peyrot wrote:
> This can be used by the newly-added nintendo-otp nvmem module.
> 
> Signed-off-by: Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
> ---
>  arch/powerpc/boot/dts/wii.dts | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/powerpc/boot/dts/wii.dts b/arch/powerpc/boot/dts/wii.dts
> index aaa381da1906..7837c4a3f09c 100644
> --- a/arch/powerpc/boot/dts/wii.dts
> +++ b/arch/powerpc/boot/dts/wii.dts
> @@ -219,6 +219,11 @@ control@...0100 {
>  			reg = <0x0d800100 0x300>;
>  		};
>  
> +		otp@...01ec {
> +			compatible = "nintendo,hollywood-otp";
> +			reg = <0x0d8001ec 0x8>;

The OTP registers overlap with the previous node, control@...0100.
Not sure what's the best way to structure the devicetree in this case,
maybe something roughly like the following (untested, unverified):

	control@...0100 {
		compatible = "nintendo,hollywood-control", "simple-mfd";
		reg = <0x0d800100 0x300>;
		ranges;

		otp@...01ec {
			compatible = "nintendo,hollywood-otp";
			reg = <0x0d8001ec 0x8>;
		};
	};



Thanks,
Jonathan Neuschäfer

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