linux-kernel - Re: [PATCH v3 1/3] dt-bindings: mediatek: Add a binding for Mediatek JPEG Decoder

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Message-ID: <4460771.lgvC1NvD9I@avalon>
Date:   Sat, 05 Nov 2016 01:32:35 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Rick Chang <rick.chang@...iatek.com>
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        srv_heupstream@...iatek.com, linux-mediatek@...ts.infradead.org,
        Minghsiu Tsai <minghsiu.tsai@...iatek.com>
Subject: Re: [PATCH v3 1/3] dt-bindings: mediatek: Add a binding for Mediatek JPEG Decoder

Hi Rick,

Thank you for the patch.

On Friday 04 Nov 2016 13:51:18 Rick Chang wrote:
> Add a DT binding documentation for Mediatek JPEG Decoder of
> MT2701 SoC.

This version looks much better !

> Signed-off-by: Rick Chang <rick.chang@...iatek.com>
> Signed-off-by: Minghsiu Tsai <minghsiu.tsai@...iatek.com>
> ---
>  .../bindings/media/mediatek-jpeg-codec.txt         | 35 +++++++++++++++++++
>  1 file changed, 35 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/media/mediatek-jpeg-codec.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/mediatek-jpeg-codec.txt
> b/Documentation/devicetree/bindings/media/mediatek-jpeg-codec.txt new file
> mode 100644
> index 0000000..b2b19ed
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/mediatek-jpeg-codec.txt
> @@ -0,0 +1,35 @@
> +* Mediatek JPEG Decoder
> +
> +Mediatek JPEG Decoder is the JPEG decode hw present in Mediatek SoCs

Nitpicking, I'd write hardware instead of hw.

> +Required properties:
> +- compatible : "mediatek,mt2701-jpgdec"

As commented on the previous version, is this JPEG decoder unique to the 
MT2701, or is it also used (possibly with different interrupts, clocks, ...) 
in other SoCs ? In the latter case, if the JPEG decoder IP core is identical 
in multiple SoCs, a more generic compatible string would be better.

> +- reg : physical base address of the jpeg decoder registers and length of
> +  memory mapped region.
> +- interrupts : interrupt number to the interrupt controller.
> +- clocks: device clocks, see
> +  Documentation/devicetree/bindings/clock/clock-bindings.txt for details.
> +- clock-names: must contain "jpgdec-smi" and "jpgdec".
> +- power-domains: a phandle to the power domain, see
> +  Documentation/devicetree/bindings/power/power_domain.txt for details.
> +- mediatek,larb: must contain the local arbiters in the current Socs, see
> + 
> Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.txt
> +  for details.
> +- iommus: should point to the respective IOMMU block with master port as
> +  argument, see Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
> +  for details.
> +
> +Example:
> +	jpegdec: jpegdec@...04000 {
> +		compatible = "mediatek,mt2701-jpgdec";
> +		reg = <0 0x15004000 0 0x1000>;
> +		interrupts = <GIC_SPI 143 IRQ_TYPE_LEVEL_LOW>;
> +		clocks =  <&imgsys CLK_IMG_JPGDEC_SMI>,
> +			  <&imgsys CLK_IMG_JPGDEC>;
> +		clock-names = "jpgdec-smi",
> +			      "jpgdec";
> +		power-domains = <&scpsys MT2701_POWER_DOMAIN_ISP>;
> +		mediatek,larb = <&larb2>;
> +		iommus = <&iommu MT2701_M4U_PORT_JPGDEC_WDMA>,
> +			 <&iommu MT2701_M4U_PORT_JPGDEC_BSDMA>;
> +	};

-- 
Regards,

Laurent Pinchart