On Mon, Nov 28, 2016 at 4:30 PM, Kevin Hilman <khilman@xxxxxxxxxxxx> wrote:
> Hi Rob,
>
> Rob Herring <robh@xxxxxxxxxx> writes:
>
>> On Tue, Nov 22, 2016 at 07:52:44AM -0800, Kevin Hilman wrote:
>>> Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxxxx>
>>> ---
>>> .../bindings/media/ti,da850-vpif-capture.txt | 65 ++++++++++++++++++++++
>>> .../devicetree/bindings/media/ti,da850-vpif.txt | 8 +++
>>> 2 files changed, 73 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/media/ti,da850-vpif-capture.txt
>>> create mode 100644 Documentation/devicetree/bindings/media/ti,da850-vpif.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/media/ti,da850-vpif-capture.txt b/Documentation/devicetree/bindings/media/ti,da850-vpif-capture.txt
>>> new file mode 100644
>>> index 000000000000..c447ac482c1d
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/media/ti,da850-vpif-capture.txt
>>> @@ -0,0 +1,65 @@
>>> +Texas Instruments VPIF Capture
>>> +------------------------------
>>> +
>>> +The TI Video Port InterFace (VPIF) capture component is the primary
>>> +component for video capture on the DA850 family of TI DaVinci SoCs.
>>> +
>>> +TI Document number reference: SPRUH82C
>>> +
>>> +Required properties:
>>> +- compatible: must be "ti,da850-vpif-capture"
>>> +- reg: physical base address and length of the registers set for the device;
>>> +- interrupts: should contain IRQ line for the VPIF
>>> +
>>> +VPIF capture has a 16-bit parallel bus input, supporting 2 8-bit
>>> +channels or a single 16-bit channel. It should contain at least one
>>> +port child node with child 'endpoint' node. Please refer to the
>>> +bindings defined in
>>> +Documentation/devicetree/bindings/media/video-interfaces.txt.
>>> +
>>> +Example using 2 8-bit input channels, one of which is connected to an
>>> +I2C-connected TVP5147 decoder:
>>> +
>>> + vpif_capture: video-capture@0x00217000 {
>>> + reg = <0x00217000 0x1000>;
>>> + interrupts = <92>;
>>> +
>>> + port {
>>> + vpif_ch0: endpoint@0 {
>>> + reg = <0>;
>>> + bus-width = <8>;
>>> + remote-endpoint = <&composite>;
>>> + };
>>> +
>>> + vpif_ch1: endpoint@1 {
>>
>> I think probably channels here should be ports rather than endpoints.
>> AIUI, having multiple endpoints is for cases like a mux or 1 to many
>> connections. There's only one data flow, but multiple sources or sinks.
>
> Looking at this closer... , I used an endpoint because it's bascially a
> 16-bit parallel bus, that can be configured as (up to) 2 8-bit
> "channels. So, based on the video-interfaces.txt doc, I configured this
> as a single port, with (up to) 2 endpoints. That also allows me to
> connect output of the decoder directly, using the remote-endpoint
> property.
>
> So I guess I'm not fully understanding your suggestion.
NM, looks like video-interfaces.txt actually spells out this case and
defines doing it as you did.
Rob
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