Hi Laurent, Prabhakar,
On Fri, Aug 21, 2020 at 12:37:35PM +0100, Lad, Prabhakar wrote:
> Hi Laurent and Jacopo
>
> On Wed, Aug 19, 2020 at 2:54 PM Laurent Pinchart
> <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote:
> >
> > Hi Jacopo,
> >
> > Thank you for the patch.
> >
> > On Tue, Aug 18, 2020 at 02:20:12PM +0200, Jacopo Mondi wrote:
> > > Document endpoint properties for the parallel bus type and
> > > add them to the example.
> > >
> > > Specify a few constraints:
> > > - If the bus type is BT.656 no hsync or vsycn polarities can be
> > > specified.
> > > - If the bus width is 10 bits, not data-shift can be applied.
> > >
> > > Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> > > ---
> > > .../devicetree/bindings/media/i2c/ov772x.yaml | 43 +++++++++++++++++++
> > > 1 file changed, 43 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/media/i2c/ov772x.yaml b/Documentation/devicetree/bindings/media/i2c/ov772x.yaml
> > > index 75dad40f70cc..3fad5dffd19a 100644
> > > --- a/Documentation/devicetree/bindings/media/i2c/ov772x.yaml
> > > +++ b/Documentation/devicetree/bindings/media/i2c/ov772x.yaml
> > > @@ -50,9 +50,47 @@ properties:
> > > bus-type:
> > > enum: [5, 6]
> > >
> > > + bus-width:
> > > + enum: [8, 10]
> > > + default: 10
> > > +
> > > + data-shift:
> > > + enum: [0, 2]
> > > + default: 0
> > > +
> > > + hsync-active:
> > > + enum: [0, 1]
> > > + default: 1
> > > +
> > > + vsync-active:
> > > + enum: [0, 1]
> > > + default: 1
> > > +
> > > + pclk-sample:
> > > + enum: [0, 1]
> > > + default: 1
> > > +
> > > remote-endpoint:
> > > description: A phandle to the bus receiver's endpoint node.
> > >
> > > + allOf:
> > > + - if:
> > > + properties:
> > > + bus-type:
> > > + const: 6
> > > + then:
> > > + properties:
> > > + hsync-active: false
> > > + vsync-active: false
> > > +
> > > + - if:
> > > + properties:
> > > + bus-width:
> > > + const: 10
> > > + then:
> > > + properties:
> > > + data-shift:
> > > + const: 0
> >
> > I'd add a blank line here.
> >
> > > required:
> > > - bus-type
> >
> > Should some of the properties be required ? Possibly conditioned on
> > bus-type ?
> >
I am not sure. They all have defaults, as reported here and as
supported by the driver. There's nothing -strictly- required, as long
as the here reported defaults are correct.
> Agreed, would be interesting to know how this can be handled (split
> out bus-type and add required properties for each) ?
>
That already happens with
+ - if:
+ properties:
+ bus-type:
+ const: 6
+ then:
+ properties:
+ hsync-active: false
+ vsync-active: false
And could be expanded, if we want any of these to be required.
Thanks
j
> Cheers,
> Prabhakar
>
> > >
> > > @@ -82,6 +120,11 @@ examples:
> > > port {
> > > ov772x_0: endpoint {
> > > bus-type = <5>;
> > > + vsync-active = <0>;
> > > + hsync-active = <0>;
> > > + pclk-sample = <0>;
> > > + bus-width = <8>;
> > > + data-shift = <0>;
> > > remote-endpoint = <&vcap1_in0>;
> > > };
> > > };
> >
> > --
> > Regards,
> >
> > Laurent Pinchart
