linux-kernel - Re: [PATCH 3/5] arm64: dts: allwinner: a64: add simplefb for A64 SoC

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Date:   Tue, 13 Mar 2018 09:27:24 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Harald Geyer <harald@...ib.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andre Przywara <andre.przywara@....com>,
        Icenowy Zheng <icenowy@...c.io>, info@...mex.com
Subject: Re: [PATCH 3/5] arm64: dts: allwinner: a64: add simplefb for A64 SoC

On Mon, Mar 12, 2018 at 04:10:48PM +0000, Harald Geyer wrote:
> The A64 SoC features two display pipelines, one has a LCD output, the
> other has a HDMI output.
> 
> Add support for simplefb for the LCD output. Tested on Teres I.
> 
> This patch was inspired by work of Icenowy Zheng.
> 
> Signed-off-by: Harald Geyer <harald@...ib.org>
> ---
>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> index ca1b365bc722..05d5e8def68a 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -52,6 +52,26 @@
>  	#address-cells = <1>;
>  	#size-cells = <1>;
>  
> +	chosen {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +/*
> + * The pipeline mixer0-lcd0 depends on clock CLK_MIXER0 from DE2 CCU.
> + * However there is no support for this clock on A64 yet, so we depend
> + * on the upstream clocks here to keep them (and thus CLK_MIXER0) up.
> + */

There's definitely support for the CLK_MIXER0 clock in the DE2 CCU
driver, so I guess this would need to be amended / fixed

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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