Hi Laurent,
On Thu, Dec 22, 2016 at 6:05 PM, Laurent Pinchart
<laurent.pinchart@xxxxxxxxxxxxxxxx> wrote:
> On Wednesday 21 Dec 2016 08:10:37 Ramesh Shanmugasundaram wrote:
>> Add binding documentation for Renesas R-Car Digital Radio Interface
>> (DRIF) controller.
>>
>> Signed-off-by: Ramesh Shanmugasundaram
>> <ramesh.shanmugasundaram@xxxxxxxxxxxxxx> ---
>> .../devicetree/bindings/media/renesas,drif.txt | 202 ++++++++++++++++++
>> 1 file changed, 202 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/media/renesas,drif.txt
>>
>> diff --git a/Documentation/devicetree/bindings/media/renesas,drif.txt
>> b/Documentation/devicetree/bindings/media/renesas,drif.txt new file mode
>> 100644
>> index 0000000..1f3feaf
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/renesas,drif.txt
>> +Optional properties of an internal channel when:
>> + - It is the only enabled channel of the bond (or)
>> + - If it acts as primary among enabled bonds
>> +--------------------------------------------------------
>> +- renesas,syncmd : sync mode
>> + 0 (Frame start sync pulse mode. 1-bit width pulse
>> + indicates start of a frame)
>> + 1 (L/R sync or I2S mode) (default)
>> +- renesas,lsb-first : empty property indicates lsb bit is received
>> first.
>> + When not defined msb bit is received first (default)
>> +- renesas,syncac-active: Indicates sync signal polarity, 0/1 for low/high
>> + respectively. The default is 1 (active high)
>> +- renesas,dtdl : delay between sync signal and start of reception.
>> + The possible values are represented in 0.5 clock
>> + cycle units and the range is 0 to 4. The default
>> + value is 2 (i.e.) 1 clock cycle delay.
>> +- renesas,syncdl : delay between end of reception and sync signal
>> edge.
>> + The possible values are represented in 0.5 clock
>> + cycle units and the range is 0 to 4 & 6. The default
>> + value is 0 (i.e.) no delay.
>
> Most of these properties are pretty similar to the video bus properties
> defined at the endpoint level in
> Documentation/devicetree/bindings/media/video-interfaces.txt. I believe it
> would make sense to use OF graph and try to standardize these properties
> similarly.
Note that the last two properties match the those in
Documentation/devicetree/bindings/spi/sh-msiof.txt.
We may want to use one DRIF channel as a plain SPI slave with the
(modified) MSIOF driver in the future.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
