linux-kernel - Re: [PATCH] ARM: dt: sun8i-h3: Add sunxi-sid to dts for sun8i-h3

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Date:   Wed, 19 Oct 2016 09:40:16 +0200
From:   LABBE Corentin <clabbe.montjoie@...il.com>
To:     Jean-Francois Moine <moinejf@...e.fr>
Cc:     robh+dt@...nel.org, mark.rutland@....com,
        maxime.ripard@...e-electrons.com, wens@...e.org,
        devicetree@...r.kernel.org, linux@...linux.org.uk,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: dt: sun8i-h3: Add sunxi-sid to dts for sun8i-h3

On Wed, Oct 05, 2016 at 12:21:30PM +0200, Jean-Francois Moine wrote:
> On Wed,  5 Oct 2016 11:48:24 +0200
> Corentin Labbe <clabbe.montjoie@...il.com> wrote:
> 
> > This patch add support for the sunxi-sid driver to the device tree for sun8i-h3.
> > 
> > Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> > ---
> >  arch/arm/boot/dts/sun8i-h3.dtsi | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
> > index 9f58bb4..abfd29c 100644
> > --- a/arch/arm/boot/dts/sun8i-h3.dtsi
> > +++ b/arch/arm/boot/dts/sun8i-h3.dtsi
> > @@ -211,6 +211,11 @@
> >  			#size-cells = <0>;
> >  		};
> >  
> > +		sid: eeprom@...14200 {
> > +			compatible = "allwinner,sun7i-a20-sid";
> > +			reg = <0x01c14200 0x200>;
> 
> The datasheet says 1Kb starting at 0x01c14000.
> Is there any reason to reduce the area and to shift the offset?
> 

According to http://linux-sunxi.org/SID_Register_Guide "For Allwinner A83T and H3 the SID address space starts at 0x01c14000, and the e-fuses are at offset 0x200".
So I use this offset, since the sunxi_sid driver need the base address of e-fuses.

The easiest solution is to use 0x01c14200 since the other part of sid is not used and not known (A83T/H3 user manual doesnt give any information on all sid space, worse for A64 which reference SID only in memory map).

So probably for H3/A64/A83T, there will never any usage of the rest of the SID address space.

Regards
Corentin Labbe