linux-kernel - Re: [PATCH v2 4/8] arm64: dts: allwinner: Add ARM Mali GPU node for H6

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Message-ID: <20190411152752.qlabx7heh74dy2ao@flea>
Date:   Thu, 11 Apr 2019 17:27:52 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jernej Škrabec <jernej.skrabec@...l.net>
Cc:     Clément Péron <peron.clem@...il.com>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Icenowy Zheng <icenowy@...c.io>,
        Jagan Teki <jagan@...rulasolutions.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        dri-devel@...ts.freedesktop.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 4/8] arm64: dts: allwinner: Add ARM Mali GPU node for
 H6

On Thu, Apr 11, 2019 at 05:23:25PM +0200, Jernej Škrabec wrote:
> Dne četrtek, 11. april 2019 ob 17:20:04 CEST je Clément Péron napisal(a):
> > Hi,
> >
> > On Thu, 11 Apr 2019 at 17:05, Jernej Škrabec <jernej.skrabec@...l.net>
> wrote:
> > > Dne četrtek, 11. april 2019 ob 12:57:16 CEST je Clément Péron napisal(a):
> > > > Add the mali gpu node to the H6 device-tree.
> > > >
> > > > Signed-off-by: Clément Péron <peron.clem@...il.com>
> > > > ---
> > > >
> > > >  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 14 ++++++++++++++
> > > >  1 file changed, 14 insertions(+)
> > > >
> > > > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > > > b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi index
> > > > e0dc4a05c1ba..196753110434 100644
> > > > --- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > > > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > > > @@ -157,6 +157,20 @@
> > > >
> > > >                       allwinner,sram = <&ve_sram 1>;
> > > >
> > > >               };
> > > >
> > > > +             gpu: gpu@...0000 {
> > > > +                     compatible = "allwinner,sun50i-h6-mali",
> > > > +                                  "arm,mali-t720";
> > > > +                     reg = <0x01800000 0x4000>;
> > > > +                     interrupts = <GIC_SPI 84
> > >
> > > IRQ_TYPE_LEVEL_HIGH>,
> > >
> > > > +                                  <GIC_SPI 85
> > >
> > > IRQ_TYPE_LEVEL_HIGH>,
> > >
> > > > +                                  <GIC_SPI 83
> > >
> > > IRQ_TYPE_LEVEL_HIGH>;
> > >
> > > > +                     interrupt-names = "job", "mmu", "gpu";
> > > > +                     clocks = <&ccu CLK_GPU>, <&ccu CLK_BUS_GPU>;
> > > > +                     clock-names = "core", "bus";
> > > > +                     resets = <&ccu RST_BUS_GPU>;
> > > > +                     status = "disabled";
> > >
> > > Usually self sufficient peripherals are enabled by default in DTSI.
> >
> > I follow the other Mali Midgard (rk3399, rk3288) syntax.
> > But I think you're right here, will go for an update I think.
>
> I quickly checked A64 and H5 DTSI and both have GPU enabled by default (status
> property is not set).

I asked myself the same question, but the H6 seems to have a supply
wired to the GPU, while the H3 and H5 do not. So I'm not sure we want
to enable it on all the boards, even though some might have left out
the GPU supply which will result in a non-working GPU (I assume?)

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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