linux-kernel - Re: [PATCH 03/22] dt-bindings: sun6i-a31-mipi-dphy: Add optional direction property

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Message-ID: <YUBRwNxIuU0+/CyS@aptenodytes>
Date:   Tue, 14 Sep 2021 09:39:44 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-staging@...ts.linux.dev,
        Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Helen Koike <helen.koike@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 03/22] dt-bindings: sun6i-a31-mipi-dphy: Add optional
 direction property

Hi,

On Mon 13 Sep 21, 10:00, Maxime Ripard wrote:
> On Fri, Sep 10, 2021 at 08:41:28PM +0200, Paul Kocialkowski wrote:
> > The Allwinner A31 MIPI D-PHY block supports both tx and rx directions,
> > although each instance of the block is meant to be used in one
> > direction only. There will typically be one instance for MIPI DSI and
> > one for MIPI CSI-2 (it seems unlikely to ever see a shared instance).
> > 
> > Describe the direction with a new allwinner,direction property.
> > For backwards compatibility, the property is optional and tx mode
> > should be assumed by default.
> > 
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > ---
> >  .../bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml  | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml b/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml
> > index d0b541a461f3..303bbaf3b915 100644
> > --- a/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml
> > +++ b/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml
> > @@ -37,6 +37,18 @@ properties:
> >    resets:
> >      maxItems: 1
> >  
> > +  allwinner,direction:
> > +    $ref: '/schemas/types.yaml#/definitions/string'
> > +    description: |
> > +      Direction of the D-PHY:
> > +      - "rx" for receiving (e.g. when used with MIPI CSI-2);
> > +      - "tx" for transmitting (e.g. when used with MIPI DSI).
> > +
> > +      When the property is missing, "tx" direction is assumed.
> 
> You can provide this using default

Understood.

> > +    oneOf:
> > +      - const: tx
> > +      - const: rx
> > +
> 
> enum?

Ah yes, enum feels like a better fit!

Thanks,

Paul

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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