linux-kernel - Re: [PATCH v2 2/3] arm64: dts: allwinner: a64: Add A64 CSI controller

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Date:   Thu, 6 Dec 2018 16:34:45 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-amarula@...rulasolutions.com,
        Michael Trimarchi <michael@...rulasolutions.com>
Subject: Re: [PATCH v2 2/3] arm64: dts: allwinner: a64: Add A64 CSI controller

On Thu, Dec 06, 2018 at 06:53:05PM +0530, Jagan Teki wrote:
> Allwinner A64 CSI controller has similar features as like in
> H3, So add support for A64 via H3 fallback.
> 
> Also updated CSI_SCLK to use 300MHz via assigned-clocks, since
> the default clock 600MHz seems unable to drive the sensor(ov5640)
> to capture the image.
> 
> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> ---
> Changes for v2:
> - Use CSI_SCLK to 300MHz 
> 
>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> index 384c417cb7a2..d7ab0006ebce 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -532,6 +532,12 @@
>  			interrupt-controller;
>  			#interrupt-cells = <3>;
>  
> +			csi_pins: csi-pins {
> +				pins = "PE0", "PE2", "PE3", "PE4", "PE5", "PE6",
> +				       "PE7", "PE8", "PE9", "PE10", "PE11";
> +				function = "csi0";
> +			};
> +
>  			i2c0_pins: i2c0_pins {
>  				pins = "PH0", "PH1";
>  				function = "i2c0";
> @@ -899,6 +905,23 @@
>  			status = "disabled";
>  		};
>  
> +		csi: csi@...0000 {
> +			compatible = "allwinner,sun50i-a64-csi",
> +				     "allwinner,sun8i-h3-csi";
> +			reg = <0x01cb0000 0x1000>;
> +			interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&ccu CLK_BUS_CSI>,
> +				 <&ccu CLK_CSI_SCLK>,
> +				 <&ccu CLK_DRAM_CSI>;
> +			clock-names = "bus", "mod", "ram";
> +			resets = <&ccu RST_BUS_CSI>;
> +			pinctrl-names = "default";
> +			pinctrl-0 = <&csi_pins>;
> +			assigned-clocks = <&ccu CLK_CSI_SCLK>;
> +			assigned-clock-rates = <300000000>;

That should be enforced in the driver.

Maxime

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

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