linux-kernel - Re: [PATCH 4/6] ARM: dts: sun8i: a83t: Add device node for CSI (Camera Sensor Interface)

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Message-ID: <20190409075804.4zrwjil7ie2gjigu@flea>
Date:   Tue, 9 Apr 2019 09:58:04 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Chen-Yu Tsai <wens@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: Re: [PATCH 4/6] ARM: dts: sun8i: a83t: Add device node for CSI
 (Camera Sensor Interface)

Hi,

On Tue, Apr 09, 2019 at 12:57:42AM +0800, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@...e.org>
>
> The A83T SoC has a camera sensor interface (known as CSI in Allwinner
> lingo), which is similar to the one found on the A64 and H3. The only
> difference seems to be that support of MIPI CSI through a connected
> MIPI CSI-2 bridge.
>
> Add a device node for it, and pinctrl nodes for the commonly used MCLK
> and 8-bit parallel interface. The property /omit-if-no-ref/ is added to
> the pinctrl nodes to keep the device tree blob size down if they are
> unused.
>
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  arch/arm/boot/dts/sun8i-a83t.dtsi | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun8i-a83t.dtsi b/arch/arm/boot/dts/sun8i-a83t.dtsi
> index f739b88efb53..0c52f945fd5f 100644
> --- a/arch/arm/boot/dts/sun8i-a83t.dtsi
> +++ b/arch/arm/boot/dts/sun8i-a83t.dtsi
> @@ -682,6 +682,20 @@
>  			#interrupt-cells = <3>;
>  			#gpio-cells = <3>;
>
> +			/omit-if-no-ref/
> +			csi_8bit_parallel_pins: csi-8bit-parallel-pins {
> +				pins = "PE0", "PE2", "PE3", "PE6", "PE7",
> +				       "PE8", "PE9", "PE10", "PE11",
> +				       "PE12", "PE13";
> +				function = "csi";
> +			};
> +
> +			/omit-if-no-ref/
> +			csi_mclk_pin: csi-mclk-pin {
> +				pins = "PE1";
> +				function = "csi";
> +			};
> +
>  			emac_rgmii_pins: emac-rgmii-pins {
>  				pins = "PD2", "PD3", "PD4", "PD5", "PD6", "PD7",
>  				       "PD11", "PD12", "PD13", "PD14", "PD18",
> @@ -994,6 +1008,23 @@
>  			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_HIGH)>;
>  		};
>
> +		csi: camera@...0000 {
> +			compatible = "allwinner,sun8i-a83t-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>;
> +			status = "disabled";
> +
> +			csi_in: port {
> +				#address-cells = <1>;
> +				#size-cells = <0>;

If we expect a single enpoint, then we don't need the address-cells
and size-cells properties.

Maxime

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

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