linux-kernel - Re: [PATCH v4] arm64: dts: ti: k3-j721s2: Add support for ADC nodes

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Message-ID: <20230313170542.jehrem7egp6lelgf@repeater>
Date:   Mon, 13 Mar 2023 12:05:42 -0500
From:   Nishanth Menon <nm@...com>
To:     Bhavya Kapoor <b-kapoor@...com>
CC:     <devicetree@...r.kernel.org>, <robh+dt@...nel.org>,
        <vigneshr@...com>, <kristo@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] arm64: dts: ti: k3-j721s2: Add support for ADC nodes

On 16:58-20230313, Bhavya Kapoor wrote:
> J721s2 has two instances of 8 channel ADCs in MCU domain. Add DT nodes
> for both instances of 8 channel ADCs for J721s2 SoC.
Drop the second line..

> 
> Signed-off-by: Bhavya Kapoor <b-kapoor@...com>
> ---
> 
> Changelog v3->v4:
> - add leading zeroes to reg address to match existing convention
> - change clock names for adc to 'fck'
> - remove spaces from start of line

Please provide links to previous versions of the patches.

> 
>  .../dts/ti/k3-j721s2-common-proc-board.dts    | 14 +++++++
>  .../boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi     | 40 +++++++++++++++++++
>  2 files changed, 54 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
> index a7aa6cf08acd..3bc4f28c809f 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
> @@ -309,3 +309,17 @@ &mcu_mcan1 {
>  	pinctrl-0 = <&mcu_mcan1_pins_default>;
>  	phys = <&transceiver2>;
>  };
> +
> +&tscadc0 {
> +	status = "okay";
> +	adc {
> +		ti,adc-channels = <0 1 2 3 4 5 6 7>;
> +	};
> +};
> +
> +&tscadc1 {
> +	status = "okay";

Curious: ADCs work without pinmux? any test log?

> +	adc {
> +		ti,adc-channels = <0 1 2 3 4 5 6 7>;
> +	};
> +};
> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
> index 0af242aa9816..5da5f0cf7009 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
> @@ -306,4 +306,44 @@ cpts@...00 {
>  			ti,cpts-periodic-outputs = <2>;
>  		};
>  	};
> +
> +	tscadc0: tscadc@...00000 {
> +		compatible = "ti,am3359-tscadc";
> +		reg = <0x00 0x40200000 0x00 0x1000>;
> +		interrupts = <GIC_SPI 860 IRQ_TYPE_LEVEL_HIGH>;
> +		power-domains = <&k3_pds 0 TI_SCI_PD_EXCLUSIVE>;
> +		clocks = <&k3_clks 0 0>;
> +		assigned-clocks = <&k3_clks 0 2>;
> +		assigned-clock-rates = <60000000>;
> +		clock-names = "fck";
> +		dmas = <&main_udmap 0x7400>,
> +			<&main_udmap 0x7401>;
> +		dma-names = "fifo0", "fifo1";
> +		status = "disabled";

If it works without pinmux, why disable by default?

> +
> +		adc {
> +			#io-channel-cells = <1>;
> +			compatible = "ti,am3359-adc";
> +		};
> +	};
> +
> +	tscadc1: tscadc@...10000 {
> +		compatible = "ti,am3359-tscadc";
> +		reg = <0x00 0x40210000 0x00 0x1000>;
> +		interrupts = <GIC_SPI 861 IRQ_TYPE_LEVEL_HIGH>;
> +		power-domains = <&k3_pds 1 TI_SCI_PD_EXCLUSIVE>;
> +		clocks = <&k3_clks 1 0>;
> +		assigned-clocks = <&k3_clks 1 2>;
> +		assigned-clock-rates = <60000000>;
> +		clock-names = "fck";
> +		dmas = <&main_udmap 0x7402>,
> +			<&main_udmap 0x7403>;
> +		dma-names = "fifo0", "fifo1";
> +		status = "disabled";
> +
> +		adc {
> +			#io-channel-cells = <1>;
> +			compatible = "ti,am3359-adc";
> +		};
> +	};
>  };
> -- 
> 2.34.1
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D