linux-kernel - Re: [PATCH RFC 1/8] dt-bindings: Document the hi6220 bindings for DRM driver

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Date:	Wed, 16 Sep 2015 16:34:20 +0800
From:	Xinwei Kong <kong.kongxinwei@...ilicon.com>
To:	<architt@...eaurora.org>, <lars@...afoo.de>, <treding@...dia.com>
CC:	Rob Herring <robh@...nel.org>, <airlied@...ux.ie>,
	<corbet@....net>, <catalin.marinas@....com>, <will.deacon@....com>,
	<dri-devel@...ts.freedesktop.org>, <linux-doc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linuxarm@...wei.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<xinliang.liu@...aro.org>, <andy.green@...aro.org>,
	<qijiwen@...ilicon.com>, <gongyu@...ilicon.com>,
	<haojian.zhuang@...aro.org>, <liguozhu@...ilicon.com>,
	<xuwei5@...ilicon.com>, <yinshengbao@...ilicon.com>,
	<yanhaifeng@...ilicon.com>, <ml.yang@...ilicon.com>,
	<yimin@...wei.com>, <w.f@...wei.com>, <puck.chen@...ilicon.com>,
	<bintian.wang@...wei.com>, <benjamin.gaignard@...aro.org>,
	<xuyiping@...ilicon.com>, <james.yanglong@...ilicon.com>,
	<fangdechun@...ilicon.com>, <linux-arm-msm@...r.kernel.org>,
	<laurent.pinchart@...asonboard.com>,
	"Andy Green" <andy.green@...aro.org>,
	<srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH RFC 1/8] dt-bindings: Document the hi6220 bindings for
 DRM driver

hi architt

On 2015/9/16 2:11, Rob Herring wrote:
> On 09/15/2015 04:37 AM, Xinwei Kong wrote:
>> This adds documentation of device tree bindings for the
>> Graphics Processing Unit of hi6220 SOC.
>>
>> Signed-off-by: Xinliang Liu <xinliang.liu@...aro.org>
>> Signed-off-by: Xinwei Kong <kong.kongxinwei@...ilicon.com>
>> Signed-off-by: Andy Green <andy.green@...aro.org>
>> Signed-off-by: Jiwen Qi <qijiwen@...ilicon.com>
>> Signed-off-by: Yu Gong <gongyu@...ilicon.com>
>> ---
>>  .../devicetree/bindings/gpu/hisilicon,hi6220.txt   | 69 ++++++++++++++++++++++
>>  1 file changed, 69 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/gpu/hisilicon,hi6220.txt
>>
>> diff --git a/Documentation/devicetree/bindings/gpu/hisilicon,hi6220.txt b/Documentation/devicetree/bindings/gpu/hisilicon,hi6220.txt
>> new file mode 100644
>> index 0000000..173ac63
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/gpu/hisilicon,hi6220.txt
>> @@ -0,0 +1,69 @@
>> + * Hisilicon hi6220 Graphics Processing Unit for HiKey board
>> +
>> + ** display-subsystem: Master device for binding DRM sub-components
> 
> DRM is a Linuxism that doesn't belong in the binding.
> 
>> +    This master device is parent node and it will be responsible to bind all
>> +    sub-components devices node.
> 
> Are these nodes a single block in the h/w? If not, you should describe
> the connection of sub-nodes with of-graph instead.
> 
>> +    - Required properties :
>> +      - compatible: "hisilicon,display-subsystem".
>> +      - #address-cells, #size-cells: Must be present if the device has sub-nodes.
>> +      - ranges: to allow probing of subdevices.
>> +      - dma-coherent: Present if dma operations are coherent.
>> +
>> + ** ade: Graphic overlay, Graphic post-processing, display timing control.
>> +    This device is child node of display-subsystem
>> +    - Required properties :
>> +      - compatible: "hisilicon,hi6220-ade".
>> +      - reg: physical base address of the ADE register and length of memory
>> +	region.
>> +      - reg-names: Should contain the reg names "ade_base" and "media_base".
>> +      - interrupt: The interrupt number to the cpu. Defines the interrupt
>> +        by ADE.
>> +      - clocks: The clocks needed by the ADE module.
>> +      - clock-names: the name of the clocks.
>> +
>> + ** dsi: support mipi dsi interface
>> +    This device is child node of display-subsystem
>> +    - Required properties :
>> +      - compatible: "hisilicon,hi6220-dsi".
>> +      - reg: physical base address of the DSI register and length of memory
>> +	region.
>> +      - clocks: The clocks needed by the DSI module.
>> +      - clock-names: the name of the clocks.
>> +      -	encoder-slave: phandles to a 'encoder-slave' subnode which DSI connect
>> +        ADV7533 in order to support hdmi display.
> 
> What the ADV7533 binding looks like is still being discussed.
> "encoder-slave" is certainly DRM specific and not how it should be done.
> Most likely, this needs to use the of-graph ports.
> 
I dont how to implement the encoder bridge stuff in upstream,
you think that I will how to handle this part?

Thank you
xinwei

> Also, the ADV7533 connection is specific to HiKey. This binding should
> just generically describe how any bridge or panel is connected.
> 
> Rob
> 
> .
> 

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