Hi Geert, I'm replying here, even if a new version of the bindings for this chip has been posted[1], as they have the same ports layout. [1] https://www.spinics.net/lists/linux-renesas-soc/msg29307.html On Wed, Jun 06, 2018 at 08:34:41AM +0200, Geert Uytterhoeven wrote: > Hi Kieran, > > On Wed, Jun 6, 2018 at 1:34 AM, Kieran Bingham > <kieran.bingham+renesas@xxxxxxxxxxxxxxxx> wrote: > > Provide device tree binding documentation for the MAX9286 Quad GMSL > > deserialiser. > > > > Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx> > > Thanks for your patch! > > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/media/i2c/max9286.txt > > @@ -0,0 +1,75 @@ > > +* Maxim Integrated MAX9286 GMSL Quad 1.5Gbps GMSL Deserializer > > + > > +Required Properties: > > + - compatible: Shall be "maxim,max9286" > > + > > +The following required properties are defined externally in > > +Documentation/devicetree/bindings/i2c/i2c-mux.txt: > > + - Standard I2C mux properties. > > + - I2C child bus nodes. > > + > > +A maximum of 4 I2C child nodes can be specified on the MAX9286, to > > +correspond with a maximum of 4 input devices. > > + > > +The device node must contain one 'port' child node per device input and output > > +port, in accordance with the video interface bindings defined in > > +Documentation/devicetree/bindings/media/video-interfaces.txt. The port nodes > > +are numbered as follows. > > + > > + Port Type > > + ---------------------- > > + 0 sink > > + 1 sink > > + 2 sink > > + 3 sink > > + 4 source > > I assume the source and at least one sink are thus mandatory? > > Would it make sense to use port 0 for the source? > This would simplify extending the binding to devices with more input > ports later. I see your point, but as someone that has no idea how future chips could look like, I wonder why having multiple outputs it's more un-likely to happen than having more inputs added. Do you have any suggestion on how we can handle both cases? Thanks j > > 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
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