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

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Message-ID: <ZOR/NUuaEOpYMzVJ@skv.local>
Date:   Tue, 22 Aug 2023 12:26:13 +0300
From:   Andrey Skvortsov <andrej.skvortzov@...il.com>
To:     Pavel Machek <pavel@....cz>
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 Pavel,

On 23-08-21 18:08, Pavel Machek wrote:
> 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"....?
Thanks for the review. I'll add into commit message more details why
this address was picked.

-- 
Best regards,
Andrey Skvortsov