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

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Message-ID: <20200223103736.5uigz2nvvee3w5yr@core.my.home>
Date:   Sun, 23 Feb 2020 11:37:36 +0100
From:   Ondřej Jirman <megous@...ous.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     linux-sunxi@...glegroups.com, 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 Samuel,

On Sat, Feb 22, 2020 at 09:26:30PM -0600, Samuel Holland wrote:
> 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.

Ah, you're right. I didn't notice the fine print bellow:

  https://megous.com/dl/tmp/e696b6042b80bf2e.png

only the big number above. Hehe.

> > +		/*
> > +		 * 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.

Ok.

> > +		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>

Thanks for the feedback.

regards,
	o.

> Regards,
> Samuel