linux-kernel - Re: [PATCH] arm64: dts: pinephone: Add pstore support for PinePhone A64

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Message-ID: <20230821160817.GA2227@bug>
Date:   Mon, 21 Aug 2023 18:08:17 +0200
From:   Pavel Machek <pavel@....cz>
To:     Andrey Skvortsov <andrej.skvortzov@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Kees Cook <keescook@...omium.org>,
        Tony Luck <tony.luck@...el.com>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org,
        Jarrah Gosbell <kernel@...ef.tools>,
        Arnaud Ferraris <arnaud.ferraris@...labora.com>
Subject: Re: [PATCH] arm64: dts: pinephone: Add pstore support for PinePhone
 A64

Hi!

> This patch reserves some memory in the DTS and sets up a
> pstore device tree node to enable pstore support.
> 
> Signed-off-by: Andrey Skvortsov <andrej.skvortzov@...il.com>
> 
> Gbp-Pq: Topic pinephone
> Gbp-Pq: Name 0161-arm64-dts-pinephone-Add-pstore-support-for-PinePhone.patch
> ---
>  .../boot/dts/allwinner/sun50i-a64-pinephone.dtsi | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> index 87847116ab6d..84f9410b0b70 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> @@ -19,6 +19,22 @@ aliases {
>  		serial0 = &uart0;
>  	};
>  
> +	reserved-memory {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		pstore_mem: ramoops@...00000 {
> +			compatible = "ramoops";
> +			reg = <0x61000000 0x100000>;
> +			record-size = <0x20000>;
> +			console-size = <0x20000>;
> +			ftrace-size = <0x20000>;
> +			pmsg-size = <0x20000>;
> +			ecc-size = <16>;
> +		};
> +	};

dts is supposed to be for hardware description, but this is really policy decision.

Should we have something like "any dram is suitable for pstore"....?

Best regards,
										Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html