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SubjectRe: [PATCH v3 2/3] arm64: dts: renesas: draak: Describe CVBS input
HI Laurent,

On Mon, May 21, 2018 at 04:10:34PM +0300, Laurent Pinchart wrote:
> Hi Jacopo,
>
> On Monday, 21 May 2018 15:33:40 EEST jacopo mondi wrote:
> > On Mon, May 21, 2018 at 01:54:55PM +0300, Laurent Pinchart wrote:
> > > On Monday, 21 May 2018 12:57:05 EEST jacopo mondi wrote:
> > >> On Fri, May 18, 2018 at 06:12:15PM +0300, Laurent Pinchart wrote:
> > >>> On Friday, 18 May 2018 17:47:57 EEST Jacopo Mondi wrote:
> > >>>> Describe CVBS video input through analog video decoder ADV7180
> > >>>> connected to video input interface VIN4.
> > >>>>
> > >>>> The video input signal path is shared with HDMI video input, and
> > >>>> selected by on-board switches SW-53 and SW-54 with CVBS input
> > >>>> selected by the default switches configuration.
> > >>>>
> > >>>> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> > >>>> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> > >>>>
> > >>>> ---
> > >>>> v2 -> v3:
> > >>>> - Add comment to describe the shared input video path
> > >>>> - Add my SoB and Niklas' R-b tags
> > >>>> ---
> > >>>>
> > >>>> arch/arm64/boot/dts/renesas/r8a77995-draak.dts | 42 ++++++++++++++++++
> > >>>> 1 file changed, 42 insertions(+)
> > >>>>
> > >>>> diff --git a/arch/arm64/boot/dts/renesas/r8a77995-draak.dts
> > >>>> b/arch/arm64/boot/dts/renesas/r8a77995-draak.dts index
> > >>>> 9d73de8..95745fc
> > >>>> 100644
> > >>>> --- a/arch/arm64/boot/dts/renesas/r8a77995-draak.dts
> > >>>> +++ b/arch/arm64/boot/dts/renesas/r8a77995-draak.dts
> > >>>> @@ -142,6 +142,11 @@
> > >>>> groups = "usb0";
> > >>>> function = "usb0";
> > >>>> };
> > >>>> +
> > >>>> + vin4_pins_cvbs: vin4 {
> > >>>> + groups = "vin4_data8", "vin4_sync", "vin4_clk";
> > >>>> + function = "vin4";
> > >>>> + };
> > >>>> };
> > >>>>
> > >>>> &i2c0 {
> > >>>> @@ -154,6 +159,23 @@
> > >>>> reg = <0x50>;
> > >>>> pagesize = <8>;
> > >>>> };
> > >>>> +
> > >>>> + analog-video@20 {
> > >>>> + compatible = "adi,adv7180";
> > >>>> + reg = <0x20>;
> > >>>> +
> > >>>> + port {
> > >>>
> > >>> The adv7180 DT bindings document the output port as 3 or 6
> > >>> (respectively for the CP and ST versions of the chip). You should thus
> > >>> number the port. Apart from that the patch looks good.
> > >>
> > >> I admit I have barely copied this from Gen-2 boards DTS, but reading
> > >> the driver code and binding description again, I think this is
> > >> correct, as the output port numbering and mandatory input port (which
> > >> is missing here) only apply to adv7180cp/st chip versions.
> > >>
> > >> Here we describe plain adv7180, no need to number output ports afaict.
> > >
> > > Indeed, my bad.
> > >
> > > Shouldn't you however use "adi,adv7180cp" as that's the chip we are using
> > > ?
> > > The "adi,adv7180" has no port documented in its DT bindings, so it
> > > shouldn't have any port node at all.
> >
> > I'm a bit confused here.
> >
> > The only Gen-2 board using the "adi,adv7180cp" compatible string is
> > Gose, which is also the only one I can get schematics for. That board
> > indeed feature an ADV7180WBCP32Z, as the Draak does. I cannot get
> > schematics for any other Gen-2 board, to compare the ADV7180 variant
> > installed there. If anyone can confirm that all other Gen-2 board uses
> > a different version (or that all other Gen-2 board DTS file use a
> > wrong compatible string value), I'll re-send this with a different
> > compatible value and proper port nodes numbering.
>
> Other Gen2 boards use a ADV7180WBCP32Z as well. The issue here isn't that the
> chip you're trying to support is different. The DT bindings that were
> initially written for the adi,adv7180 didn't have port nodes. When it was time
> to add them, we realized that two variants of the chip existed with different
> connectivity. We have thus added two new compatible strings to differentiate
> them, with different port numbers. The old compatible string should be
> deprecated in favour of the new ones.
>

Ack, thanks for explaining.

I don't have any Gen2 board here, but if someone is willing to test, I
can change the Gen2 bindings to use the new version in a follow-up
series.

Thanks
j

> > >>>> + /*
> > >>>> + * The VIN4 video input path is shared between
> > >>>> + * CVBS and HDMI inputs through SW[49-54] switches.
> > >>>> + *
> > >>>> + * CVBS is the default selection, link it to VIN4 here.
> > >>>> + */
> > >>>> + adv7180_out: endpoint {
> > >>>> + remote-endpoint = <&vin4_in>;
> > >>>> + };
> > >>>> + };
> > >>>> + };
> > >>>> };
> > >>>>
> > >>>> &i2c1 {
> > >>>> @@ -246,3 +268,23 @@
> > >>>> timeout-sec = <60>;
> > >>>> status = "okay";
> > >>>> };
> >>>> +
> > >>>> +&vin4 {
> > >>>> + pinctrl-0 = <&vin4_pins_cvbs>;
> > >>>> + pinctrl-names = "default";
> > >>>> +
> > >>>> + status = "okay";
> > >>>> +
> > >>>> + ports {
> > >>>> + #address-cells = <1>;
> > >>>> + #size-cells = <0>;
> > >>>> +
> > >>>> + port@0 {
> > >>>> + reg = <0>;
> > >>>> +
> > >>>> + vin4_in: endpoint {
> > >>>> + remote-endpoint = <&adv7180_out>;
> > >>>> + };
> > >>>> + };
> > >>>> + };
> > >>>> +};
>
> --
> Regards,
>
> Laurent Pinchart
>
>
>
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