linux-kernel - Re: [PATCH v2 09/19] ARM: dts: sunxi: h3/h5: Add CSI controller port for parallel input

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Message-ID: <20201202154601.ws7wrx6msrp3u4pd@gilmour>
Date:   Wed, 2 Dec 2020 16:46:01 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-sunxi@...glegroups.com, Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonathan Corbet <corbet@....net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        kevin.lhopital@...mail.com
Subject: Re: [PATCH v2 09/19] ARM: dts: sunxi: h3/h5: Add CSI controller port
 for parallel input

On Wed, Dec 02, 2020 at 04:02:09PM +0100, Paul Kocialkowski wrote:
> Hi,
> 
> On Tue 01 Dec 20, 13:14, Maxime Ripard wrote:
> > On Sat, Nov 28, 2020 at 03:28:29PM +0100, Paul Kocialkowski wrote:
> > > Since the CSI controller binding is getting a bit more complex due
> > > to the addition of MIPI CSI-2 bridge support, make the ports node
> > > explicit with the parallel port.
> > > 
> > > This way, it's clear that the controller only supports parallel
> > > interface input and there's no confusion about the port number.
> > > 
> > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > > ---
> > >  arch/arm/boot/dts/sunxi-h3-h5.dtsi | 9 +++++++++
> > >  1 file changed, 9 insertions(+)
> > > 
> > > diff --git a/arch/arm/boot/dts/sunxi-h3-h5.dtsi b/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> > > index 9be13378d4df..02b698cace6a 100644
> > > --- a/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> > > +++ b/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> > > @@ -803,6 +803,15 @@ csi: camera@...0000 {
> > >  			pinctrl-names = "default";
> > >  			pinctrl-0 = <&csi_pins>;
> > >  			status = "disabled";
> > > +
> > > +			ports {
> > > +				#address-cells = <1>;
> > > +				#size-cells = <0>;
> > > +
> > > +				csi_in_parallel: port@0 {
> > > +					reg = <0>;
> > > +				};
> > > +			};
> > >  		};
> > 
> > This will create a DTC warning, since port@0 is the only node, and is
> > equivalent to port
> 
> I'm not seeing the warning when running dtbs_check.

Some are silenced by the Linux build system. You can pass W=1 to your
make command line enable all of them.

> More generally, why is it a problem that there's only one node defined?
> 
> One issue that I did see is that the port node doesn't have an endpoint
> here, so I will remove the requirement to have an endpoint in the bindings
> documentation to allow this kind of definition.

We definitely want to have the endpoint required. If the CSI node is
disabled, the error should be ignored by the dt-validate tool though

Maxime

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