linux-kernel - Re: [PATCH v6 16/22] arm64: dts: allwinner: a64: Add DSI pipeline

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Date:   Fri, 25 Jan 2019 19:51:22 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Chen-Yu Tsai <wens@...e.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-amarula@...rulasolutions.com, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v6 16/22] arm64: dts: allwinner: a64: Add DSI pipeline

On Fri, Jan 25, 2019 at 01:28:54AM +0530, Jagan Teki wrote:
> The A64 has a MIPI-DSI block which is similar to A31.
> 
> Add dsi, dphy nodes with A31 fallback compatible and finally
> connect the dsi node to tcon0 node to make proper DSI pipeline.
> 
> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> ---
>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 47 +++++++++++++++++++
>  1 file changed, 47 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> index cdc154b14a7e..e18d81aff813 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -358,6 +358,12 @@
>  					#address-cells = <1>;
>  					#size-cells = <0>;
>  					reg = <1>;
> +
> +					tcon0_out_dsi: endpoint@1 {
> +						reg = <1>;
> +						remote-endpoint = <&dsi_in_tcon0>;
> +						allwinner,tcon-channel = <1>;
> +					};
>  				};
>  			};
>  		};
> @@ -935,6 +941,47 @@
>  			status = "disabled";
>  		};
>  
> +		dsi: dsi@...0000 {
> +			compatible = "allwinner,sun50i-a64-mipi-dsi",
> +				     "allwinner,sun6i-a31-mipi-dsi";
> +			reg = <0x01ca0000 0x1000>;
> +			interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&ccu CLK_BUS_MIPI_DSI>,
> +				 <&ccu CLK_DSI_DPHY>;

This one looks weird. There's only a single clock in the A64, and it
seems to be for the D-PHY only.

And the rate is fixed at 148.5 MHz apparently, as opposed to the
current code that is running at twice that speed.

Maxime

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