Subject: Re: [RFC,v4,1/4] media: dt-bindings: mt8183: Added camera ISP Pass 1

From: Rob Herring <[email-masked]>
Date: Wed, 21 Aug 2019 14:47:52 -0500

On Wed, Aug 07, 2019 at 08:48:00PM +0800, Jungo Lin wrote:
> This patch adds DT binding document for the Pass 1 (P1) unit
> in Mediatek's camera ISP system. The Pass 1 unit grabs the sensor
> data out from the sensor interface, applies ISP image effects
> from tuning data and outputs the image data or statistics data to DRAM.
> 
> Signed-off-by: Jungo Lin <[email-masked]>
> ---
>  .../bindings/media/mediatek,camisp.txt        | 73 +++++++++++++++++++
>  1 file changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,camisp.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/mediatek,camisp.txt b/Documentation/devicetree/bindings/media/mediatek,camisp.txt
> new file mode 100644
> index 000000000000..fa2713acceca
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/mediatek,camisp.txt
> @@ -0,0 +1,73 @@
> +* Mediatek Image Signal Processor Pass 1 (ISP P1)
> +
> +The Pass 1 unit of Mediatek's camera ISP system grabs the sensor data out
> +from the sensor interface, applies ISP effects from tuning data and outputs
> +the image data and statistics data to DRAM. Furthermore, Pass 1 unit has
> +the ability to output two different resolutions frames at the same time to
> +increase the performance of the camera application.
> +
> +Required properties:
> +- compatible: Must be "mediatek,mt8183-camisp" for MT8183.
> +- reg: Physical base address of the camera function block register and
> +  length of memory mapped region. Must contain an entry for each entry
> +  in reg-names.
> +- reg-names: Must include the following entries:
> +  "cam_sys": Camera base function block
> +  "cam_uni": Camera UNI function block
> +  "cam_a": Camera ISP P1 hardware unit A
> +  "cam_b": Camera ISP P1 hardware unit B
> +  "cam_c": Camera ISP P1 hardware unit C
> +- interrupts: Must contain an entry for each entry in interrupt-names.
> +- interrupt-names : Must include the following entries:
> +  "cam_uni": Camera UNI interrupt
> +  "cam_a": Camera unit A interrupt
> +  "cam_b": Camera unit B interrupt
> +  "cam_c": Camera unit C interrupt
> +- iommus: Shall point to the respective IOMMU block with master port
> +  as argument, see Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
> +  for details.
> +- clocks: A list of phandle and clock specifier pairs as listed
> +  in clock-names property, see
> +  Documentation/devicetree/bindings/clock/clock-bindings.txt for details.
> +- clock-names: Must be "camsys_cam_cgpdn" and "camsys_camtg_cgpdn".
> +- mediatek,larb: Must contain the local arbiters in the current SoCs, see
> +  Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.txt
> +  for details.
> +- power-domains: a phandle to the power domain, see
> +  Documentation/devicetree/bindings/power/power_domain.txt for details.
> +- mediatek,scp : The node of system control processor (SCP), see
> +  Documentation/devicetree/bindings/remoteproc/mtk,scp.txt for details.
> +
> +Example:
> +SoC specific DT entry:
> +
> +		camisp: camisp@1a000000 {
> +			compatible = "mediatek,mt8183-camisp", "syscon";

syscon doesn't seem appropriate nor is it documented.

> +			reg = <0 0x1a000000 0 0x1000>,
> +					<0 0x1a003000 0 0x1000>,
> +					<0 0x1a004000 0 0x2000>,
> +					<0 0x1a006000 0 0x2000>,
> +					<0 0x1a008000 0 0x2000>;
> +			reg-names = "cam_sys",
> +					"cam_uni",
> +					"cam_a",
> +					"cam_b",
> +					"cam_c";
> +			interrupts = <GIC_SPI 253 IRQ_TYPE_LEVEL_LOW>,
> +					<GIC_SPI 254 IRQ_TYPE_LEVEL_LOW>,
> +					<GIC_SPI 255 IRQ_TYPE_LEVEL_LOW>,
> +					<GIC_SPI 256 IRQ_TYPE_LEVEL_LOW>;
> +			interrupt-names = "cam_uni",
> +					"cam_a",
> +					"cam_b",
> +					"cam_c";
> +			iommus = <&iommu M4U_PORT_CAM_IMGO>;
> +			clocks = <&camsys CLK_CAM_CAM>,
> +					<&camsys CLK_CAM_CAMTG>;
> +			clock-names = "camsys_cam_cgpdn",
> +					"camsys_camtg_cgpdn";
> +			mediatek,larb = <&larb3>,
> +					<&larb6>;
> +			power-domains = <&scpsys MT8183_POWER_DOMAIN_CAM>;
> +			mediatek,scp = <&scp>;
> +		};
> -- 
> 2.18.0
> 

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