linux-kernel - Re: [PATCH v4] arm64: dts: qcom: qcs6490-rb3gen2: enable hdmi bridge

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Date: Tue, 28 May 2024 19:33:35 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Prahlad Valluru <quic_vvalluru@...cinc.com>
Cc: andersson@...nel.org, conor+dt@...nel.org, devicetree@...r.kernel.org, 
	konrad.dybcio@...aro.org, krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, quic_abhinavk@...cinc.com, quic_nankam@...cinc.com, 
	robh@...nel.org
Subject: Re: [PATCH v4] arm64: dts: qcom: qcs6490-rb3gen2: enable hdmi bridge

On Tue, May 28, 2024 at 09:54:34PM +0530, Prahlad Valluru wrote:
> On Tue, May 28, 2024 at 06:00:26PM +0300, Dmitry Baryshkov wrote:
> > On Tue, May 28, 2024 at 07:49:54PM +0530, Venkata Prahlad Valluru wrote:
> > > Rb3Gen2 has a lt9611uxc DSI-to-HDMI bridge on i2c0, with
> > > reset gpio from pm7250b gpio2 and irq gpio from tlmm gpio24.
> > > Bridge supplies are Vdd connected to input supply directly
> > > and vcc to L11c. Enable HDMI output, bridge and corresponding
> > > DSI output.
> > > 
> > > Signed-off-by: Venkata Prahlad Valluru <quic_vvalluru@...cinc.com>
> > > ---
> > > v4: added fixed regulator for vdd
> > 
> > Please don't send new iterations as replies to the previous iteration.
> > It might be ignored or mishandled by the tools.
> Was trying to have the context of discussion captured. Will add links
> to the patchsets in the history, going forward.

I'd suggest using b4 tool, which handles such issues in an automated
way. It adds links to previous iterations, changelog, etc.

> > 
> > > 
> > > v3: - Updated commit text
> > >     - Arranged nodes in alphabetical order
> > >     - Fixed signoff
> > >     - Fixed drive strength for lt9611_irq_pin
> > >     - Removed 'label' from hdmi-connector, which is optional
> > > 
> > > v2: Addressed dtschema errors
> > > 	- Fixed lt9611-irq
> > > 	- vdd-supply error to be ignored, as it is connected to
> > > 	  input supply directly, on rb3gen2
> > > ---
> > >  arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 94 ++++++++++++++++++++
> > >  1 file changed, 94 insertions(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> > > index a085ff5b5fb2..7f00fca131a2 100644
> > > --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> > > +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> > > @@ -52,6 +52,25 @@
> > >  		};
> > >  	};
> > >  
> > > +	hdmi-connector {
> > > +		compatible = "hdmi-connector";
> > > +		type = "a";
> > > +
> > > +		port {
> > > +			hdmi_con: endpoint {
> > > +				remote-endpoint = <&lt9611_out>;
> > > +			};
> > > +		};
> > > +	};
> > > +
> > > +	lt9611_1v2: lt9611-vdd12-regulator {
> > > +		compatible = "regulator-fixed";
> > > +		regulator-name = "LT9611_1V2";
> > 
> > Is it the regulator / net name in schematics? Or is it also used by any
> > other consumers?
> >
> VREG_HDMI_OUT_1P2 is the naming in schematic, but i see this naming convention for rb5 based boards.
> No other consumers for this.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> > > +
> > > +		regulator-min-microvolt = <1200000>;
> > > +		regulator-max-microvolt = <1200000>;
> > > +	};
> > > +
> > >  	reserved-memory {
> > >  		xbl_mem: xbl@...00000 {
> > >  			reg = <0x0 0x80700000 0x0 0x100000>;
> > > @@ -530,6 +549,46 @@
> > >  			   <GCC_WPSS_RSCP_CLK>;
> > >  };
> > >  
> > > +&i2c0 {
> > > +	clock-frequency = <400000>;
> > > +	status = "okay";
> > > +
> > > +	lt9611_codec: hdmi-bridge@2b {
> > > +		compatible = "lontium,lt9611uxc";
> > > +		reg = <0x2b>;
> > > +
> > > +		interrupts-extended = <&tlmm 24 IRQ_TYPE_EDGE_FALLING>;
> > > +		reset-gpios = <&pm7250b_gpios 2 GPIO_ACTIVE_HIGH>;
> > > +
> > > +		vdd-supply = <&lt9611_1v2>;
> > > +		vcc-supply = <&vreg_l11c_2p8>;
> > > +
> > > +		pinctrl-names = "default";
> > > +		pinctrl-0 = <&lt9611_irq_pin &lt9611_rst_pin>;
> > > +
> > > +		ports {
> > > +			#address-cells = <1>;
> > > +			#size-cells = <0>;
> > > +
> > > +			port@0 {
> > > +				reg = <0>;
> > > +
> > > +				lt9611_a: endpoint {
> > > +					remote-endpoint = <&mdss_dsi0_out>;
> > > +				};
> > > +			};
> > > +
> > > +			port@2 {
> > > +				reg = <2>;
> > > +
> > > +				lt9611_out: endpoint {
> > > +					remote-endpoint = <&hdmi_con>;
> > > +				};
> > > +			};
> > > +		};
> > > +	};
> > > +};
> > > +
> > >  &i2c1 {
> > >  	status = "okay";
> > >  
> > > @@ -587,6 +646,21 @@
> > >  	remote-endpoint = <&usb_dp_qmpphy_dp_in>;
> > >  };
> > >  
> > > +&mdss_dsi {
> > > +	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";
> > > +};
> > > +
> > >  &mdss_edp {
> > >  	status = "okay";
> > >  };
> > > @@ -711,3 +785,23 @@
> > >  	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 = <2>;
> > > +		bias-disable;
> > > +	};
> > > +};
> > > -- 
> > > 2.17.1
> > > 
> > 
> > -- 
> > With best wishes
> > Dmitry

-- 
With best wishes
Dmitry