linux-kernel - Re: [PATCH RFC 2/7] arm64: dts: qcom: qcs6490-rb3gen2: Add qps615 node

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Date: Wed, 26 Jun 2024 20:51:42 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Krishna chaitanya chundru <quic_krichai@...cinc.com>
Cc: Bartosz Golaszewski <brgl@...ev.pl>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, Rob Herring <robh@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Jingoo Han <jingoohan1@...il.com>, quic_vbadigan@...cinc.com, 
	quic_skananth@...cinc.com, quic_nitegupt@...cinc.com, linux-arm-msm@...r.kernel.org, 
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 2/7] arm64: dts: qcom: qcs6490-rb3gen2: Add qps615
 node

On Wed, Jun 26, 2024 at 06:07:50PM GMT, Krishna chaitanya chundru wrote:
> QPS615 switch power is controlled by GPIO's. Once the GPIO's are
> enabled, switch power will be on.
> 
> Make all GPIO's as fixed regulators and inter link them so that
> enabling the regulator will enable power to the switch by enabling
> GPIO's.
> 
> Enable i2c0 which is required to configure the switch.
> 
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 55 ++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> index a085ff5b5fb2..5b453896a6c9 100644
> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> @@ -511,6 +511,61 @@ vreg_bob_3p296: bob {
>  			regulator-max-microvolt = <3960000>;
>  		};
>  	};
> +
> +	qps615_0p9_vreg: qps615-0p9-vreg {
> +		compatible = "regulator-fixed";
> +		regulator-name = "qps615_0p9_vreg";
> +		gpio = <&pm8350c_gpios 2 0>;
> +		regulator-min-microvolt = <1000000>;
> +		regulator-max-microvolt = <1000000>;
> +		enable-active-high;
> +		regulator-enable-ramp-delay = <4300>;
> +	};
> +
> +	qps615_1p8_vreg: qps615-1p8-vreg {
> +		compatible = "regulator-fixed";
> +		regulator-name = "qps615_1p8_vreg";
> +		gpio = <&pm8350c_gpios 3 0>;
> +		vin-supply = <&qps615_0p9_vreg>;
> +		regulator-min-microvolt = <1800000>;
> +		regulator-max-microvolt = <1800000>;
> +		enable-active-high;
> +		regulator-enable-ramp-delay = <10000>;
> +	};
> +
> +	qps615_rsex_vreg: qps615-rsex-vreg {
> +		compatible = "regulator-fixed";
> +		regulator-name = "qps615_rsex_vreg";
> +		gpio = <&pm8350c_gpios 1 0>;
> +		vin-supply = <&qps615_1p8_vreg>;
> +		regulator-min-microvolt = <1800000>;
> +		regulator-max-microvolt = <1800000>;
> +		enable-active-high;
> +		regulator-enable-ramp-delay = <10000>;
> +	};
> +};
> +
> +&i2c0 {
> +	clock-frequency = <100000>;
> +	status = "okay";
> +};
> +
> +&pcie1 {
> +	pcie@0 {
> +		device_type = "pci";
> +		reg = <0x0 0x0 0x0 0x0 0x0>;
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +
> +		bus-range = <0x01 0xff>;
> +
> +		qps615@0 {
> +			compatible = "pci1179,0623";
> +			reg = <0x1000 0x0 0x0 0x0 0x0>;
> +			vdda-supply = <&qps615_rsex_vreg>;
> +			switch-i2c-cntrl = <&i2c0>;

We already have proper bindings for I2C devices. The QPS615 obviously
has and I2C device inside. Please add it to DT instead of referencing
the whole bus.

> +		};
> +	};
>  };
>  
>  &gcc {
> 
> -- 
> 2.42.0
> 

-- 
With best wishes
Dmitry