linux-kernel - Re: [PATCH 2/5] media: dt-bindings: Add bindings for TDA1997X

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Date:   Wed, 22 Nov 2017 20:37:04 -0800
From:   Tim Harvey <tharvey@...eworks.com>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     linux-media <linux-media@...r.kernel.org>,
        alsa-devel@...a-project.org,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Hans Verkuil <hansverk@...co.com>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 2/5] media: dt-bindings: Add bindings for TDA1997X

On Tue, Nov 21, 2017 at 11:36 PM, Sakari Ailus <sakari.ailus@....fi> wrote:
> Hi Tim,
>
> On Thu, Nov 09, 2017 at 10:45:33AM -0800, Tim Harvey wrote:
>> Cc: Rob Herring <robh@...nel.org>
>> Signed-off-by: Tim Harvey <tharvey@...eworks.com>
>> ---
>> v3:
>>  - fix typo
>>
>> v2:
>>  - add vendor prefix and remove _ from vidout-portcfg
>>  - remove _ from labels
>>  - remove max-pixel-rate property
>>  - describe and provide example for single output port
>>  - update to new audio port bindings
>> ---
>>  .../devicetree/bindings/media/i2c/tda1997x.txt     | 179 +++++++++++++++++++++
>>  1 file changed, 179 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/media/i2c/tda1997x.txt
>>
>> diff --git a/Documentation/devicetree/bindings/media/i2c/tda1997x.txt b/Documentation/devicetree/bindings/media/i2c/tda1997x.txt
>> new file mode 100644
>> index 0000000..dd37f14
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/i2c/tda1997x.txt
>> @@ -0,0 +1,179 @@
>> +Device-Tree bindings for the NXP TDA1997x HDMI receiver
>> +
>> +The TDA19971/73 are HDMI video receivers.
>> +
>> +The TDA19971 Video port output pins can be used as follows:
>> + - RGB 8bit per color (24 bits total): R[11:4] B[11:4] G[11:4]
>> + - YUV444 8bit per color (24 bits total): Y[11:4] Cr[11:4] Cb[11:4]
>> + - YUV422 semi-planar 8bit per component (16 bits total): Y[11:4] CbCr[11:4]
>> + - YUV422 semi-planar 10bit per component (20 bits total): Y[11:2] CbCr[11:2]
>> + - YUV422 semi-planar 12bit per component (24 bits total): - Y[11:0] CbCr[11:0]
>> + - YUV422 BT656 8bit per component (8 bits total): YCbCr[11:4] (2-cycles)
>> + - YUV422 BT656 10bit per component (10 bits total): YCbCr[11:2] (2-cycles)
>> + - YUV422 BT656 12bit per component (12 bits total): YCbCr[11:0] (2-cycles)
>> +
>> +The TDA19973 Video port output pins can be used as follows:
>> + - RGB 12bit per color (36 bits total): R[11:0] B[11:0] G[11:0]
>> + - YUV444 12bit per color (36 bits total): Y[11:0] Cb[11:0] Cr[11:0]
>> + - YUV422 semi-planar 12bit per component (24 bits total): Y[11:0] CbCr[11:0]
>> + - YUV422 BT656 12bit per component (12 bits total): YCbCr[11:0] (2-cycles)
>> +
>> +The Video port output pins are mapped via 4-bit 'pin groups' allowing
>> +for a variety of connection possibilities including swapping pin order within
>> +pin groups. The video_portcfg device-tree property consists of register mapping
>> +pairs which map a chip-specific VP output register to a 4-bit pin group. If
>> +the pin group needs to be bit-swapped you can use the *_S pin-group defines.
>> +
>> +Required Properties:
>> + - compatible          :
>> +  - "nxp,tda19971" for the TDA19971
>> +  - "nxp,tda19973" for the TDA19973
>> + - reg                 : I2C slave address
>> + - interrupts          : The interrupt number
>> + - DOVDD-supply        : Digital I/O supply
>> + - DVDD-supply         : Digital Core supply
>> + - AVDD-supply         : Analog supply
>> + - nxp,vidout-portcfg  : array of pairs mapping VP output pins to pin groups.
>> +
>> +Optional Properties:
>> + - nxp,audout-format   : DAI bus format: "i2s" or "spdif".
>> + - nxp,audout-width    : width of audio output data bus (1-4).
>> + - nxp,audout-layout   : data layout (0=AP0 used, 1=AP0/AP1/AP2/AP3 used).
>> + - nxp,audout-mclk-fs  : Multiplication factor between stream rate and codec
>> +                         mclk.
>> +
>> +The device node must contain one 'port' child node for its digital output
>> +video port, in accordance with the video interface bindings defined in
>> +Documentation/devicetree/bindings/media/video-interfaces.txt.
>
> Could you add that this port has one endpoint node as well? (Unless you
> support multiple, that is.)

Sure... will clarify as:

The device node must contain one endpoint 'port' child node for its
digital output
video port, in accordance with the video interface bindings defined in
Documentation/devicetree/bindings/media/video-interfaces.txt.

>> +
>> +Optional Endpoint Properties:
>> +  The following three properties are defined in video-interfaces.txt and
>> +  are valid for source endpoints only:
>
> Transmitters? Don't you have an endpoint only in the port representing the
> transmitter?

I'm not usre what you mean.

The TDA1997x is an HDMI receiver meaning it receives HDMI and decodes
it to a parallel video bus. HDMI transmitters are the opposite.

Regards,

Tim