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Date: Fri, 12 Mar 2021 09:29:04 +0200
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: media: Convert video-mux to DT schema
Hi Laurent,
On Fri, Mar 12, 2021 at 03:25:11AM +0200, Laurent Pinchart wrote:
> Hi Rob,
>
> Thank you for the patch.
>
> On Thu, Mar 11, 2021 at 04:40:42PM -0700, Rob Herring wrote:
> > Now that we have the graph schema, convert the video-mux binding to DT
> > schema.
> >
> > Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
> > Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> > Cc: linux-media@...r.kernel.org
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
> > .../devicetree/bindings/media/video-mux.txt | 60 ------------
> > .../devicetree/bindings/media/video-mux.yaml | 93 +++++++++++++++++++
> > 2 files changed, 93 insertions(+), 60 deletions(-)
> > delete mode 100644 Documentation/devicetree/bindings/media/video-mux.txt
> > create mode 100644 Documentation/devicetree/bindings/media/video-mux.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/media/video-mux.txt b/Documentation/devicetree/bindings/media/video-mux.txt
> > deleted file mode 100644
> > index 63b9dc913e45..000000000000
> > --- a/Documentation/devicetree/bindings/media/video-mux.txt
> > +++ /dev/null
> > @@ -1,60 +0,0 @@
> > -Video Multiplexer
> > -=================
> > -
> > -Video multiplexers allow to select between multiple input ports. Video received
> > -on the active input port is passed through to the output port. Muxes described
> > -by this binding are controlled by a multiplexer controller that is described by
> > -the bindings in Documentation/devicetree/bindings/mux/mux-controller.txt
> > -
> > -Required properties:
> > -- compatible : should be "video-mux"
> > -- mux-controls : mux controller node to use for operating the mux
> > -- #address-cells: should be <1>
> > -- #size-cells: should be <0>
> > -- port@*: at least three port nodes containing endpoints connecting to the
> > - source and sink devices according to of_graph bindings. The last port is
> > - the output port, all others are inputs.
> > -
> > -Optionally, #address-cells, #size-cells, and port nodes can be grouped under a
> > -ports node as described in Documentation/devicetree/bindings/graph.txt.
> > -
> > -Example:
> > -
> > - mux: mux-controller {
> > - compatible = "gpio-mux";
> > - #mux-control-cells = <0>;
> > -
> > - mux-gpios = <&gpio1 15 GPIO_ACTIVE_HIGH>;
> > - };
> > -
> > - video-mux {
> > - compatible = "video-mux";
> > - mux-controls = <&mux>;
> > - #address-cells = <1>;
> > - #size-cells = <0>;
> > -
> > - port@0 {
> > - reg = <0>;
> > -
> > - mux_in0: endpoint {
> > - remote-endpoint = <&video_source0_out>;
> > - };
> > - };
> > -
> > - port@1 {
> > - reg = <1>;
> > -
> > - mux_in1: endpoint {
> > - remote-endpoint = <&video_source1_out>;
> > - };
> > - };
> > -
> > - port@2 {
> > - reg = <2>;
> > -
> > - mux_out: endpoint {
> > - remote-endpoint = <&capture_interface_in>;
> > - };
> > - };
> > - };
> > -};
> > diff --git a/Documentation/devicetree/bindings/media/video-mux.yaml b/Documentation/devicetree/bindings/media/video-mux.yaml
> > new file mode 100644
> > index 000000000000..780fbbd46a38
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/video-mux.yaml
> > @@ -0,0 +1,93 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/video-mux.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Video Multiplexer
> > +
> > +maintainers:
> > + - Sakari Ailus <sakari.ailus@...ux.intel.com>
> > + - Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > +
> > +description:
> > + Video multiplexers allow to select between multiple input ports. Video
> > + received on the active input port is passed through to the output port. Muxes
> > + described by this binding are controlled by a multiplexer controller.
> > +
> > +properties:
> > + compatible:
> > + const: video-mux
> > +
> > + mux-controls:
> > + maxItems: 1
> > +
> > + '#address-cells':
> > + const: 1
> > +
> > + '#size-cells':
> > + const: 0
> > +
> > + ports:
> > + $ref: /schemas/graph.yaml#/properties/ports
> > +
> > + patternProperties:
> > + '^port@':
> > + $ref: /schemas/graph.yaml#/properties/port
>
> Should we require at least port@0, port@1 and port@2 ?
>
> > +
> > +patternProperties:
> > + '^port@':
> > + $ref: /schemas/graph.yaml#/properties/port
> > + description:
> > + At least three port nodes containing endpoints connecting to the source
> > + and sink devices according to of_graph bindings. The last port is the
> > + output port, all others are inputs.
> > +
> > +required:
> > + - compatible
> > + - mux-controls
>
> Should a constraint be added to ensure that either a ports node or
> port@0, port@1 and port@2 nodes exists ?
It's not meaningful to have this device without such nodes. But a mux with
more ports could be connected in a way that leaves one or both of ports 1
and 2 unconnected. It's still not a likely configuration but a possible
one.
Either way,
Reviewed-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/gpio/gpio.h>
> > +
> > + mux: mux-controller {
> > + compatible = "gpio-mux";
> > + #mux-control-cells = <0>;
> > +
> > + mux-gpios = <&gpio1 15 GPIO_ACTIVE_HIGH>;
> > + };
> > +
> > + video-mux {
> > + compatible = "video-mux";
> > + mux-controls = <&mux>;
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + port@0 {
> > + reg = <0>;
> > +
> > + mux_in0: endpoint {
> > + remote-endpoint = <&video_source0_out>;
> > + };
> > + };
> > +
> > + port@1 {
> > + reg = <1>;
> > +
> > + mux_in1: endpoint {
> > + remote-endpoint = <&video_source1_out>;
> > + };
> > + };
> > +
> > + port@2 {
> > + reg = <2>;
> > +
> > + mux_out: endpoint {
> > + remote-endpoint = <&capture_interface_in>;
> > + };
> > + };
> > + };
> > +...
--
Kind regards,
Sakari Ailus
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