linux-kernel - Re: [PATCH v4 5/6] dt-bindings: display: add Unisoc's mipi dsi controller bindings

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Date:   Wed, 7 Apr 2021 12:46:53 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Kevin Tang <kevin3.tang@...il.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 5/6] dt-bindings: display: add Unisoc's mipi dsi
 controller bindings

On Wed, Mar 31, 2021 at 09:49:14AM +0800, Kevin Tang wrote:
> Hi Maxime,
> 
> Maxime Ripard <maxime@...no.tech> 于2021年3月24日周三 下午7:13写道：
> 
> > On Mon, Feb 22, 2021 at 09:28:21PM +0800, Kevin Tang wrote:
> > > From: Kevin Tang <kevin.tang@...soc.com>
> > >
> > > Adds MIPI DSI Controller
> > > support for Unisoc's display subsystem.
> > >
> > > Cc: Orson Zhai <orsonzhai@...il.com>
> > > Cc: Chunyan Zhang <zhang.lyra@...il.com>
> > > Signed-off-by: Kevin Tang <kevin.tang@...soc.com>
> > > Reviewed-by: Rob Herring <robh@...nel.org>
> > > ---
> > >  .../display/sprd/sprd,sharkl3-dsi-host.yaml   | 102 ++++++++++++++++++
> > >  1 file changed, 102 insertions(+)
> > >  create mode 100644
> > Documentation/devicetree/bindings/display/sprd/sprd,sharkl3-dsi-host.yaml
> > >
> > > diff --git
> > a/Documentation/devicetree/bindings/display/sprd/sprd,sharkl3-dsi-host.yaml
> > b/Documentation/devicetree/bindings/display/sprd/sprd,sharkl3-dsi-host.yaml
> > > new file mode 100644
> > > index 000000000..d439f688f
> > > --- /dev/null
> > > +++
> > b/Documentation/devicetree/bindings/display/sprd/sprd,sharkl3-dsi-host.yaml
> > > @@ -0,0 +1,102 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id:
> > http://devicetree.org/schemas/display/sprd/sprd,sharkl3-dsi-host.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Unisoc MIPI DSI Controller
> > > +
> > > +maintainers:
> > > +  - Kevin Tang <kevin.tang@...soc.com>
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: sprd,sharkl3-dsi-host
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  interrupts:
> > > +    maxItems: 2
> > > +
> > > +  clocks:
> > > +    minItems: 1
> > > +
> > > +  clock-names:
> > > +    items:
> > > +      - const: clk_src_96m
> > > +
> > > +  power-domains:
> > > +    maxItems: 1
> > > +
> > > +  ports:
> > > +    type: object
> > > +
> > > +    properties:
> > > +      "#address-cells":
> > > +        const: 1
> > > +
> > > +      "#size-cells":
> > > +        const: 0
> > > +
> > > +      port@0:
> > > +        type: object
> > > +        description:
> > > +          A port node with endpoint definitions as defined in
> > > +          Documentation/devicetree/bindings/media/video-interfaces.txt.
> > > +          That port should be the input endpoint, usually coming from
> > > +          the associated DPU.
> > > +      port@1:
> > > +        type: object
> > > +        description:
> > > +          A port node with endpoint definitions as defined in
> > > +          Documentation/devicetree/bindings/media/video-interfaces.txt.
> > > +          That port should be the output endpoint, usually output to
> > > +          the associated panel.
> >
> > The DSI generic binding asks that peripherals that are controlled
> > through a DCS be a subnode of the MIPI-DSI bus, not through a port
> > endpoint.
> >
>  Our DSI controller don't support DCS now...

I'm not sure I follow you, you mentionned in the patch 4 that you were
testing for a device to be in command mode, how would that work without
DCS support?

Maxime

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