linux-kernel - Re: [PATCH v2 07/15] arm64: dts: allwinner: h5: Add system-control node with SRAM C1

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Date:   Wed, 5 Dec 2018 17:49:57 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Linux Media Mailing List <linux-media@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devel@...verdev.osuosl.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Hans Verkuil <hverkuil@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: Re: [PATCH v2 07/15] arm64: dts: allwinner: h5: Add system-control
 node with SRAM C1

On Wed, Dec 5, 2018 at 5:48 PM Paul Kocialkowski
<paul.kocialkowski@...tlin.com> wrote:
>
> Hi,
>
> On Wed, 2018-12-05 at 17:45 +0800, Chen-Yu Tsai wrote:
> > On Wed, Dec 5, 2018 at 5:25 PM Paul Kocialkowski
> > <paul.kocialkowski@...tlin.com> wrote:
> > > Add the H5-specific system control node description to its device-tree
> > > with support for the SRAM C1 section, that will be used by the video
> > > codec node later on.
> > >
> > > The CPU-side SRAM address was obtained empirically while the size was
> > > taken from the documentation. They may not be entirely accurate.
> > >
> > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > > ---
> > >  arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi | 22 ++++++++++++++++++++
> > >  1 file changed, 22 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi
> > > index b41dc1aab67d..42bfb560b367 100644
> > > --- a/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi
> > > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi
> > > @@ -94,6 +94,28 @@
> > >         };
> > >
> > >         soc {
> > > +               system-control@...0000 {
> > > +                       compatible = "allwinner,sun50i-h5-system-control";
> > > +                       reg = <0x01c00000 0x1000>;
> > > +                       #address-cells = <1>;
> > > +                       #size-cells = <1>;
> > > +                       ranges;
> > > +
> > > +                       sram_c1: sram@...0000 {
> > > +                               compatible = "mmio-sram";
> > > +                               reg = <0x00018000 0x1c000>;
> >
> > 0x1d00000 or 0x18000?
>
> For the H5, I found the VE SRAM area to be mapped to 0x18000 on the CPU
> side (when testing with devmem), unlike the A64, H3 and others. I was
> rather surprised about this as well!

I'm actually referring to the node name that still says 1d00000.

ChenYu

>
> > > +                               #address-cells = <1>;
> > > +                               #size-cells = <1>;
> > > +                               ranges = <0 0x00018000 0x1c000>;
> >
> > Same here.
> >
> > > +
> > > +                               ve_sram: sram-section@0 {
> > > +                                       compatible = "allwinner,sun50i-h5-sram-c1",
> > > +                                                    "allwinner,sun4i-a10-sram-c1";
> > > +                                       reg = <0x000000 0x1c000>;
> > > +                               };
> > > +                       };
> > > +               };
> > > +
> > >                 mali: gpu@...0000 {
> > >                         compatible = "allwinner,sun50i-h5-mali", "arm,mali-450";
> > >                         reg = <0x01e80000 0x30000>;
> > > --
> > > 2.19.2
>
> Cheers,
>
> Paul
>
> --
> Paul Kocialkowski, Bootlin (formerly Free Electrons)
> Embedded Linux and kernel engineering
> https://bootlin.com
>