linux-kernel - Re: [PATCH v7 09/12] ARM: dts: sun6i: a31: add sgx gpu child node

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Message-Id: <VTBE9Q.B8A32JWI2Q9V3@crapouillou.net>
Date:   Sun, 26 Apr 2020 14:53:55 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Jonathan Bakker <xc-racer2@...e.ca>,
        Philipp Rossak <embed3d@...il.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        openpvrsgx-devgroup@...ux.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com, linux-mips@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v7 09/12] ARM: dts: sun6i: a31: add sgx gpu child node



Le ven. 24 avril 2020 à 22:34, H. Nikolaus Schaller 
<hns@...delico.com> a écrit :
> From: Philipp Rossak <embed3d@...il.com>
> 
> We are adding the devicetree binding for the PVR-SGX-544-115 gpu.
> 
> This driver is currently under development in the openpvrsgx-devgroup.
> Right now the full binding is not figured out, so we provide here a
> placeholder. It will be completed as soon as there is a demo 
> available.
> 
> The currently used binding that is used during development is more
> complete and was already verifyed by loading the kernelmodule 
> successful.
> 
> Signed-off-by: Philipp Rossak <embed3d@...il.com>
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
>  arch/arm/boot/dts/sun6i-a31.dtsi | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun6i-a31.dtsi 
> b/arch/arm/boot/dts/sun6i-a31.dtsi
> index f3425a66fc0a..933a825bf460 100644
> --- a/arch/arm/boot/dts/sun6i-a31.dtsi
> +++ b/arch/arm/boot/dts/sun6i-a31.dtsi
> @@ -1417,5 +1417,16 @@ p2wi: i2c@...3400 {
>  			#address-cells = <1>;
>  			#size-cells = <0>;
>  		};
> +
> +		gpu: gpu@...00000 {
> +			compatible = "allwinner,sun8i-a31-sgx544-115",
> +				     "img,sgx544-115", "img,sgx544";
> +			reg = <0x01c40000 0x10000>;
> +			/*
> +			 * This node is currently a placeholder for the gpu.
> +			 * This will be completed when a full demonstration
> +			 * of the openpvrsgx driver is available for this board.
> +			 */

This node doesn't have clocks, so I don't see how it'd work.

Better delay the introduction of the GPU node for this board until you 
know it works.

-Paul

> +		};
>  	};
>  };
> --
> 2.25.1
>