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

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Message-ID: <1478333989.27859.27.camel@mtksdaap41>
Date:   Sat, 5 Nov 2016 16:19:49 +0800
From:   Rick Chang <rick.chang@...iatek.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.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 Laurent,

Thanks for your prompt reply. I will fix them in patch v4.

On Sat, 2016-11-05 at 01:32 +0200, Laurent Pinchart wrote:
> 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 !

I'm glad to hear that!

> > 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.

OK.

> > +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.

I understand your question. The essence of this patch series targeting
is the JPEG decoder IP which is integrated in mt2701.I will check it
with our hardware engineer and making a more generic compatible string
if the IP is used in multiple SoCs.

> > +- 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>;
> > +	};
>