linux-kernel - Re: [PATCH 6/8] arm64: dts: qcom: sa8295p-adp: add max20411

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Date: Thu, 21 Dec 2023 13:51:58 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Bjorn Andersson <quic_bjorande@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Taniya Das <quic_tdas@...cinc.com>,
 Ulf Hansson <ulf.hansson@...aro.org>, Johan Hovold
 <johan+linaro@...nel.org>, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 6/8] arm64: dts: qcom: sa8295p-adp: add max20411

On 21.12.2023 04:50, Bjorn Andersson wrote:
> From: Bjorn Andersson <andersson@...nel.org>
> 
> The SA8295P ADP has a MAX20411 LDO regulator on I2C 12, supplying the
> VDD_GFX pads. Enable the bus and add the maxim,max20411 device on the
> bus.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sa8295p-adp.dts | 40 ++++++++++++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sa8295p-adp.dts b/arch/arm64/boot/dts/qcom/sa8295p-adp.dts
> index fd253942e5e5..e16406c9c19d 100644
> --- a/arch/arm64/boot/dts/qcom/sa8295p-adp.dts
> +++ b/arch/arm64/boot/dts/qcom/sa8295p-adp.dts
> @@ -266,6 +266,26 @@ &dispcc1 {
>  	status = "okay";
>  };
>  
> +&i2c12 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&qup1_i2c4_state>;
property-n
property-names

(same below)
> +
> +	status = "okay";
> +
> +	vdd_gfx: regulator@39 {
> +		compatible = "maxim,max20411";
> +		reg = <0x39>;
> +
> +		regulator-min-microvolt = <800000>;
> +		regulator-max-microvolt = <968750>;
Is this ever going to be scaled? I suppose you could add some OPP code to
drm/msm and use opp-microvolts.. Or lock this down at min=max

Konrad