linux-kernel - Re: [linux-sunxi] [PATCH] arm64: dts: sun50i-h5-orange-pi-pc2: Add CPUX voltage regulator

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Date:   Sat, 22 Feb 2020 21:26:30 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     megous@...ous.com, linux-sunxi@...glegroups.com
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-sunxi] [PATCH] arm64: dts: sun50i-h5-orange-pi-pc2: Add
 CPUX voltage regulator

Hi Ondrej,

On 2/22/20 3:45 PM, Ondrej Jirman wrote:
> Orange Pi PC2 features sy8106a regulator just like Orange Pi PC.
> 
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> ---
>  .../dts/allwinner/sun50i-h5-orangepi-pc2.dts  | 29 +++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-pc2.dts b/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-pc2.dts
> index 70b5f09984218..5feedde95b5fc 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-pc2.dts
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-pc2.dts
> @@ -85,6 +85,10 @@ reg_usb0_vbus: usb0-vbus {
>  	};
>  };
>  
> +&cpu0 {
> +	cpu-supply = <&reg_vdd_cpux>;
> +};
> +

This should go alphabetically after "codec".

>  &codec {
>  	allwinner,audio-routing =
>  		"Line Out", "LINEOUT",
> @@ -180,6 +184,31 @@ flash@0 {
>  	};
>  };
>  
> +&r_i2c {

This should go alphabetically before "spi0".

> +	status = "okay";
> +
> +	reg_vdd_cpux: regulator@65 {
> +		compatible = "silergy,sy8106a";
> +		reg = <0x65>;
> +		regulator-name = "vdd-cpux";
> +		silergy,fixed-microvolt = <1200000>;

The resistors in the datasheet (10k/11.8k) make this 1.1V.

> +		/*
> +		 * The datasheet uses 1.1V as the minimum value of VDD-CPUX,
> +		 * however both the Armbian DVFS table and the official one
> +		 * have operating points with voltage under 1.1V, and both
> +		 * DVFS table are known to work properly at the lowest
> +		 * operating point.
> +		 *
> +		 * Use 1.0V as the minimum voltage instead.
> +		 */

The datasheet I have for H5 has "TBD" for the VDD-CPUX volatage range. I think
this comment only applies to H3 and is not necessary here.

> +		regulator-min-microvolt = <1000000>;
> +		regulator-max-microvolt = <1400000>;
> +		regulator-ramp-delay = <200>;
> +		regulator-boot-on;
> +		regulator-always-on;
> +	};
> +};
> +
>  &uart0 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&uart0_pa_pins>;
> 

Otherwise,
Reviewed-by: Samuel Holland <samuel@...lland.org>

Regards,
Samuel