linux-kernel - Re: [PATCH v2 4/8] dt-bindings: Add a binding for Mediatek Video Encoder

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Message-ID: <566EA9B1.5000102@gmail.com>
Date:	Mon, 14 Dec 2015 12:36:17 +0100
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	tiffany lin <tiffany.lin@...iatek.com>,
	Rob Herring <robh@...nel.org>
Cc:	daniel.thompson@...aro.org, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Sakari Ailus <sakari.ailus@....fi>,
	Mikhail Ulyanov <mikhail.ulyanov@...entembedded.com>,
	Fabien Dessenne <fabien.dessenne@...com>,
	Arnd Bergmann <arnd@...db.de>,
	Darren Etheridge <detheridge@...com>,
	Peter Griffin <peter.griffin@...aro.org>,
	Benoit Parrot <bparrot@...com>,
	Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	James Liao <jamesjj.liao@...iatek.com>,
	Hongzhou Yang <hongzhou.yang@...iatek.com>,
	Daniel Hsiao <daniel.hsiao@...iatek.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
	linux-mediatek@...ts.infradead.org, PoChun.Lin@...iatek.com
Subject: Re: [PATCH v2 4/8] dt-bindings: Add a binding for Mediatek Video
 Encoder



On 14/12/15 09:26, tiffany lin wrote:
> On Fri, 2015-12-11 at 11:29 -0600, Rob Herring wrote:
>> On Fri, Dec 11, 2015 at 05:55:39PM +0800, Tiffany Lin wrote:
>>> Add a DT binding documentation of Video Encoder for the
>>> MT8173 SoC from Mediatek.
>>>
>>> Signed-off-by: Tiffany Lin <tiffany.lin@...iatek.com>
>>
>> A question and minor issue below, otherwise:
>>
>> Acked-by: Rob Herring <robh@...nel.org>
>>
>>> ---
>>>   .../devicetree/bindings/media/mediatek-vcodec.txt  |   58 ++++++++++++++++++++
>>>   1 file changed, 58 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/media/mediatek-vcodec.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/media/mediatek-vcodec.txt b/Documentation/devicetree/bindings/media/mediatek-vcodec.txt
>>> new file mode 100644
>>> index 0000000..510cd81
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/media/mediatek-vcodec.txt
>>> @@ -0,0 +1,58 @@
>>> +Mediatek Video Codec
>>> +
>>> +Mediatek Video Codec is the video codec hw present in Mediatek SoCs which
>>> +supports high resolution encoding functionalities.
>>> +
>>> +Required properties:
>>> +- compatible : "mediatek,mt8173-vcodec-enc" for encoder
>>> +- reg : Physical base address of the video codec registers and length of
>>> +  memory mapped region.
>>> +- interrupts : interrupt number to the cpu.
>>> +- mediatek,larb : must contain the local arbiters in the current Socs.

This looks strange, shouldn't it be "larb" instead of "mediatek,larb".
At least the example does not use the mediatek prefix.

>>> +- clocks : list of clock specifiers, corresponding to entries in
>>> +  the clock-names property;
>>> +- clock-names: must contain "vencpll", "venc_lt_sel", "vcodecpll_370p5_ck"
>>> +- iommus : list of iommus specifiers should be enabled for hw encode.
>>> +  There are 2 cells needed to enable/disable iommu.
>>> +  The first one is local arbiter index(larbid), and the other is port
>>> +  index(portid) within local arbiter. Specifies the larbid and portid
>>> +  as defined in dt-binding/memory/mt8173-larb-port.h.
>>> +- mediatek,vpu : the node of video processor unit

Same here.

Regards,
Matthias

>>> +
>>> +Example:
>>> +vcodec_enc: vcodec@...8002000 {
>>> +    compatible = "mediatek,mt8173-vcodec-enc";
>>> +    reg = <0 0x18002000 0 0x1000>,    /*VENC_SYS*/
>>> +          <0 0x19002000 0 0x1000>;    /*VENC_LT_SYS*/
>>> +    interrupts = <GIC_SPI 198 IRQ_TYPE_LEVEL_LOW>,
>>> +           <GIC_SPI 202 IRQ_TYPE_LEVEL_LOW>;
>>> +    larb = <&larb3>,
>>> +           <&larb5>;
>>> +    iommus = <&iommu M4U_LARB3_ID M4U_PORT_VENC_RCPU>,
>>
>> Is this the same iommu as the VPU? If so, you can't have a mixed number
>> of cells.
> Yes, its same iommus as the VPU.
> Now we use two parameters for iommus.
> We will fix this in next version.
>
>>> +             <&iommu M4U_LARB3_ID M4U_PORT_VENC_REC>,
>>> +             <&iommu M4U_LARB3_ID M4U_PORT_VENC_BSDMA>,
>>> +             <&iommu M4U_LARB3_ID M4U_PORT_VENC_SV_COMV>,
>>> +             <&iommu M4U_LARB3_ID M4U_PORT_VENC_RD_COMV>,
>>> +             <&iommu M4U_LARB3_ID M4U_PORT_VENC_CUR_LUMA>,
>>> +             <&iommu M4U_LARB3_ID M4U_PORT_VENC_CUR_CHROMA>,
>>> +             <&iommu M4U_LARB3_ID M4U_PORT_VENC_REF_LUMA>,
>>> +             <&iommu M4U_LARB3_ID M4U_PORT_VENC_REF_CHROMA>,
>>> +             <&iommu M4U_LARB3_ID M4U_PORT_VENC_NBM_RDMA>,
>>> +             <&iommu M4U_LARB3_ID M4U_PORT_VENC_NBM_WDMA>,
>>> +             <&iommu M4U_LARB5_ID M4U_PORT_VENC_RCPU_SET2>,
>>> +             <&iommu M4U_LARB5_ID M4U_PORT_VENC_REC_FRM_SET2>,
>>> +             <&iommu M4U_LARB5_ID M4U_PORT_VENC_BSDMA_SET2>,
>>> +             <&iommu M4U_LARB5_ID M4U_PORT_VENC_SV_COMA_SET2>,
>>> +             <&iommu M4U_LARB5_ID M4U_PORT_VENC_RD_COMA_SET2>,
>>> +             <&iommu M4U_LARB5_ID M4U_PORT_VENC_CUR_LUMA_SET2>,
>>> +             <&iommu M4U_LARB5_ID M4U_PORT_VENC_CUR_CHROMA_SET2>,
>>> +             <&iommu M4U_LARB5_ID M4U_PORT_VENC_REF_LUMA_SET2>,
>>> +             <&iommu M4U_LARB5_ID M4U_PORT_VENC_REC_CHROMA_SET2>;
>>> +    vpu = <&vpu>;
>>
>> Need to update the example.
> Sorry, I didn't get it.
> Do you means update VPU binding document "media/mediatek-vpu.txt"?
>
>>
>>> +    clocks = <&apmixedsys CLK_APMIXED_VENCPLL>,
>>> +             <&topckgen CLK_TOP_VENC_LT_SEL>,
>>> +             <&topckgen CLK_TOP_VCODECPLL_370P5>;
>>> +    clock-names = "vencpll",
>>> +                  "venc_lt_sel",
>>> +                  "vcodecpll_370p5_ck";
>>> +  };
>>> --
>>> 1.7.9.5
>>>
>
>
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