linux-kernel - Re: [linux-sunxi] [PATCH 7/7] arm64: dts: allwinner: h6: Enable CPU and GPU opp tables for Beelink GS1

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Message-ID: <20200405113146.be2etxxjdkgtrmac@core.my.home>
Date:   Sun, 5 Apr 2020 13:31:46 +0200
From:   Ondřej Jirman <megous@...ous.com>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH 7/7] arm64: dts: allwinner: h6: Enable CPU
 and GPU opp tables for Beelink GS1

Hello,

On Sun, Apr 05, 2020 at 12:49:13PM +0200, Clément Péron wrote:
> Enable CPU and GPU opp tables for Beelink GS1.
> 
> This needs also to change the CPU regulator min/max voltage to fit
> the OPP table.
> 
> Signed-off-by: Clément Péron <peron.clem@...il.com>
> ---
>  .../arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts b/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts
> index df6d872c34e2..8e65d56a7c85 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts
> @@ -4,6 +4,8 @@
>  /dts-v1/;
>  
>  #include "sun50i-h6.dtsi"
> +#include "sun50i-h6-cpu-opp.dtsi"
> +#include "sun50i-h6-gpu-opp.dtsi"
>  
>  #include <dt-bindings/gpio/gpio.h>
>  
> @@ -70,6 +72,10 @@
>  	};
>  };
>  
> +&cpu0 {
> +	cpu-supply = <&reg_dcdca>;
> +};
> +
>  &de {
>  	status = "okay";
>  };
> @@ -226,8 +232,8 @@
>  
>  			reg_dcdca: dcdca {
>  				regulator-always-on;
> -				regulator-min-microvolt = <810000>;
> -				regulator-max-microvolt = <1080000>;
> +				regulator-min-microvolt = <820000>;
> +				regulator-max-microvolt = <1160000>;

The H6 datasheet says:

- VDD-CPU Power Supply for CPU  0.81 - 1.08 V (recommended)
- VDD-CPU Power Supply for CPU -0.30 - 1.30 V (abs max)

So I guess there's no need to increase the lower limit, because it matches
the datasheet already.

regards,
	o.

>  				regulator-name = "vdd-cpu";
>  			};
>  
> -- 
> 2.20.1
> 
> -- 
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