linux-kernel - Re: [PATCH v2 5/9] arm64: dts: ti: k3-am62x-sk: Enable camera peripherals

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Message-ID: <chhumn2ewrsadvb3gw2evlupowh7duye4imzfuv6jxxjdpdi3e@2ikxvbcxy44d>
Date:   Tue, 28 Nov 2023 14:36:54 +0530
From:   Jai Luthra <j-luthra@...com>
To:     Andrew Davis <afd@...com>
CC:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Aradhya Bhatia <a-bhatia1@...com>,
        Devarsh Thakkar <devarsht@...com>,
        Vaishnav Achath <vaishnav.a@...com>,
        Julien Massot <julien.massot@...labora.com>,
        Martyn Welch <martyn.welch@...labora.com>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>
Subject: Re: [PATCH v2 5/9] arm64: dts: ti: k3-am62x-sk: Enable camera
 peripherals

Hi Andrew,

Thanks for the comments.

On Nov 20, 2023 at 13:32:33 -0600, Andrew Davis wrote:
> On 11/17/23 3:28 AM, Jai Luthra wrote:
> > CSI cameras are controlled using I2C, on SK-AM62 and derivative boards
> > this is routed to I2C-2, so enable that bus. Also enable the nodes for
> > CSI-RX and DPHY-RX IPs.
> > 
> > Specific sensor connected to this bus will be described in the DT
> > overlay for each sensor.
> > 
> > Tested-by: Martyn Welch <martyn.welch@...labora.com>
> > Signed-off-by: Jai Luthra <j-luthra@...com>
> > ---
> >   arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 15 +++++++++++++++
> >   1 file changed, 15 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> > index 19f57ead4ebd..21658f811307 100644
> > --- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> > +++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> > @@ -399,6 +399,13 @@ sii9022_out: endpoint {
> >   	};
> >   };
> > +&main_i2c2 {
> > +	status = "okay";
> > +	pinctrl-names = "default";
> > +	pinctrl-0 = <&main_i2c2_pins_default>;
> > +	clock-frequency = <400000>;
> > +};
> > +
> >   &sdhci0 {
> >   	bootph-all;
> >   	status = "okay";
> > @@ -517,3 +524,11 @@ dpi1_out: endpoint {
> >   		};
> >   	};
> >   };
> > +
> > +&ti_csi2rx0 {
> > +	status = "okay";
> > +};
> > +
> > +&dphy0 {
> > +	status = "okay";
> > +};
> > 
> 
> Why do this in the common file? These should go in the overlays
> that actually make use of these nodes, same as you did for BeaglePlay
> in patch [4/9].

Makes sense for the csi2rx nodes, will move it to the overlay in v3.

For the i2c node (and also gpio expander on sk-am62a) I think it is 
better to enable them in the base DTB here, as it helps in 
detecting/debugging new sensors using userspace utilities like 
i2c-detect without actually having a functional overlay.

> 
> Andrew

-- 
Thanks,
Jai

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