linux-kernel - Re: [PATCH v2] arm64: dts: qcom: qcs6490-rb3gen2: enable hdmi bridge

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Date: Wed, 08 May 2024 09:31:24 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>
Cc: linux-kernel@...r.kernel.org, quic_nankam@...cinc.com, 
 linux-arm-msm@...r.kernel.org, quic_abhinavk@...cinc.com, 
 konrad.dybcio@...aro.org, Prahlad Valluru <quic_vvalluru@...cinc.com>, 
 conor+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, 
 devicetree@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: qcom: qcs6490-rb3gen2: enable hdmi
 bridge


On Mon, 06 May 2024 18:14:10 -0500, Bjorn Andersson wrote:
> On Fri, Apr 26, 2024 at 07:54:42PM GMT, Prahlad Valluru wrote:
> > From: Venkata Prahlad Valluru <quic_vvalluru@...cinc.com>
> >
> 
> Please don't thread new versions off existing version. b4 helps you with
> getting these things right, please check go/upstream for more details.
> 
> > Enable lt9611uxc bridge for qcs6490 rb3 gen2 platform.
> >
> 
> Even if it's clear what this is, I would prefer if you described the
> hardware a little bit in your commit message.
> "Rb3Gen2 has a HDMI connector, connected to DSI via a LT on i2cX.... reset and
> irq pins comes from x and y. Describe this."
> 
> > Signed-off-by: Prahlad Valluru <quic_vvalluru@...cinc.com>
> > ---
> > v2: Addressed dtschema errors
> > 	- Fixed lt9611-irq
> > 	- vdd-supply error to be ignored, as it is connected to
> > 	  input supply directly, on rb3gen2

The choice is either fix the dts or fix the binding. 

> > ---
> >  arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 86 ++++++++++++++++++++
> >  1 file changed, 86 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> > index a085ff5b5fb2..c14d4a4bb3ce 100644
> > --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> > +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> > @@ -51,6 +51,18 @@
> >  			};
> >  		};
> >  	};
> > +
> 
> There's a stray tab here, please run checkpatch --strict on your
> patches.
> 
> > +	hdmi-connector {
> > +		compatible = "hdmi-connector";
> > +		label = "HDMI";
> > +		type = "a";
> > +
> > +		port {
> > +			hdmi_con: endpoint {
> > +				remote-endpoint = <&lt9611_out>;
> > +			};
> > +		};
> > +	};
> >
> >  	reserved-memory {
> >  		xbl_mem: xbl@...00000 {
> > @@ -530,6 +542,45 @@
> [..]
> > @@ -602,6 +653,21 @@
> >  	status = "okay";
> >  };
> >
> > +&mdss_dsi {
> 
> We want to keep nodes sorted (by address if applicable, otherwise
> alphabetically on node names and on labels). "mdss_dsi" < "mdss_edp".
> 
> So please move this up where it belongs.
> 
> > +        vdda-supply = <&vreg_l6b_1p2>;
> > +        status = "okay";
> > +};
> > +
> > +&mdss_dsi0_out {
> > +        remote-endpoint = <&lt9611_a>;
> > +        data-lanes = <0 1 2 3>;
> > +};
> > +
> > +&mdss_dsi_phy {
> > +        vdds-supply = <&vreg_l10c_0p88>;
> > +        status = "okay";
> > +};
> > +
> >  &qupv3_id_0 {
> >  	status = "okay";
> >  };
> > @@ -711,3 +777,23 @@
> >  	function = "gpio";
> >  	bias-disable;
> >  };
> > +
> > +&pm7250b_gpios {
> > +        lt9611_rst_pin: lt9611-rst-state {
> > +                pins = "gpio2";
> > +                function = "normal";
> > +
> > +                output-high;
> > +                input-disable;
> > +                power-source = <0>;
> > +        };
> > +};
> > +
> > +&tlmm {
> > +        lt9611_irq_pin: lt9611-irq-state {
> > +                pins = "gpio24";
> > +                function = "gpio";
> > +                drive-strength = <8>;
> 
> I'd expect a 2 here, so please document why this is 8.
> 
> Regards,
> Bjorn
> 
> > +                bias-disable;
> > +        };
> > +};
> > --
> > 2.17.1
> >
> 
> 


My bot found new DTB warnings on the .dts files added or changed in this
series.

Some warnings may be from an existing SoC .dtsi. Or perhaps the warnings
are fixed by another series. Ultimately, it is up to the platform
maintainer whether these warnings are acceptable or not. No need to reply
unless the platform maintainer has comments.

If you already ran DT checks and didn't see these error(s), then
make sure dt-schema is up to date:

  pip3 install dtschema --upgrade


New warnings running 'make CHECK_DTBS=y qcom/qcs6490-rb3gen2.dtb' for jr3ble6sxr5mr6cvm6ldvpyk5j4rucj3xy6vbha6ttoecte3d7@...6qf6oasuc:

arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dtb: hdmi-bridge@2b: 'vdd-supply' is a required property
	from schema $id: http://devicetree.org/schemas/display/bridge/lontium,lt9611.yaml#