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Message-ID: <CACeCKaeHocnAuY5D-oVt1fhgRGkNT014RcK3JSe6piKoXNtKCQ@mail.gmail.com>
Date: Wed, 8 Jun 2022 14:56:42 -0700
From: Prashant Malani <pmalani@...omium.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
bleung@...omium.org, swboyd@...omium.org,
heikki.krogerus@...ux.intel.com,
Andrzej Hajda <andrzej.hajda@...el.com>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...ux.ie>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
"open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Hsin-Yi Wang <hsinyi@...omium.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Jonas Karlman <jonas@...boo.se>,
José Expósito <jose.exposito89@...il.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Maxime Ripard <maxime@...no.tech>,
Neil Armstrong <narmstrong@...libre.com>,
Nícolas F. R. A. Prado
<nfraprado@...labora.com>, Pin-Yen Lin <treapking@...omium.org>,
Robert Foss <robert.foss@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Sam Ravnborg <sam@...nborg.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Xin Ji <xji@...logixsemi.com>
Subject: Re: [PATCH 4/7] dt-bindings: drm/bridge: anx7625: Add mode-switch support
On Wed, Jun 8, 2022 at 10:08 AM Prashant Malani <pmalani@...omium.org> wrote:
>
> Hi Krzysztof,
>
> Thank you for looking at the patch.
>
> On Jun 08 11:24, Krzysztof Kozlowski wrote:
> > On 07/06/2022 21:00, Prashant Malani wrote:
> > > Analogix 7625 can be used in systems to switch USB Type-C DisplayPort
> > > alternate mode lane traffic between 2 Type-C ports.
> > >
> > > Update the binding to accommodate this usage by introducing a switch
> > > property.
> > >
> > > Signed-off-by: Prashant Malani <pmalani@...omium.org>
> > > ---
> > > .../display/bridge/analogix,anx7625.yaml | 56 +++++++++++++++++++
> > > 1 file changed, 56 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> > > index 35a48515836e..7e1f655ddfcc 100644
> > > --- a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> > > +++ b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> > > @@ -105,6 +105,26 @@ properties:
> > > - port@0
> > > - port@1
> > >
> > > + switches:
> > > + type: object
> > > + description: Set of switches controlling DisplayPort traffic on
> > > + outgoing RX/TX lanes to Type C ports.
> > > +
> > > + properties:
> > > + switch:
> >
> > You allow only one switch with such schema, so no need for "switches"...
>
> See below comment (summary: we'd like to allow 1 or 2 switches).
> >
> > > + $ref: /schemas/usb/typec-switch.yaml#
> > > + maxItems: 2
> >
> > Are you sure this works? what are you limiting here with maxItems? I
> > think you wanted patternProperties...
>
> Yeah, I might not have used the DT syntax correctly here.
> What I'm aiming for is:
> "switches" should can contain 1 or 2 "switch" nodes.
> 2 is the maximum (limitation of the hardware).
>
> >
> > > +
> > > + properties:
> > > + reg:
> > > + maxItems: 1
> > > +
> > > + required:
> > > + - reg
> > > +
> > > + required:
> > > + - switch@0
> >
> > This does not match the property.
> >
> > You also need unevaluatedProperties:false
>
> Ack, will update this in the next version.
Actually, could you kindly clarify which of the two needs this?
"switches" or "switch" ?
I interpreted "switch" as requiring it, but I thought it better to confirm.
>
> >
> >
> > > +
> > > required:
> > > - compatible
> > > - reg
> > > @@ -167,5 +187,41 @@ examples:
> > > };
> > > };
> > > };
> > > + switches {
> > > + #address-cells = <1>;
> > > + #size-cells = <0>;
> > > + switch@0 {
> > > + compatible = "typec-switch";
> > > + reg = <0>;
> > > + mode-switch;
> > > +
> > > + ports {
> > > + #address-cells = <1>;
> > > + #size-cells = <0>;
> > > + port@0 {
> > > + reg = <0>;
> > > + anx_typec0: endpoint {
> > > + remote-endpoint = <&typec_port0>;
> >
> > Messed up indentation. Your previous patch should also switch to 4-space
> > as recommended by schema coding style.
>
> Sorry about that, will fix up the indentation in the next version.
>
> >
> > > + };
> > > + };
> > > + };
> > > + };
> > > + switch@1 {
> > > + compatible = "typec-switch";
> > > + reg = <1>;
> > > + mode-switch;
> > > +
> > > + ports {
> > > + #address-cells = <1>;
> > > + #size-cells = <0>;
> > > + port@0 {
> > > + reg = <0>;
> > > + anx_typec1: endpoint {
> > > + remote-endpoint = <&typec_port1>;
> >
> > Ditto.
> >
> > > + };
> > > + };
> > > + };
> > > + };
> > > + };
> > > };
> > > };
> >
> >
> > Best regards,
> > Krzysztof
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