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

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Date: Tue, 28 May 2024 21:54:34 +0530
From: Prahlad Valluru <quic_vvalluru@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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 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.
> 
> > 
> > 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.
> > +
> > +		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