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

Maxime Ripard
2019-04-09T07:58:10Z

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Hi,

On Tue, Apr 09, 2019 at 12:57:42AM +0800, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@csie.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@csie.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@1cb0000 {
> + 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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