linux-kernel - Re: [PATCH 04/11] arm64: dts: mediatek: cherry: Add platform regulators layout and config

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Date:   Fri, 1 Jul 2022 18:26:09 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        matthias.bgg@...il.com, hsinyi@...omium.org,
        allen-kh.cheng@...iatek.com, gtk3@...ox.ru, luca@...tu.xyz,
        sam.shih@...iatek.com, sean.wang@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wenst@...omium.org
Subject: Re: [PATCH 04/11] arm64: dts: mediatek: cherry: Add platform
 regulators layout and config

On Thu, Jun 30, 2022 at 05:33:09PM +0200, AngeloGioacchino Del Regno wrote:
> Add the regulators layout for this platform, including the basic power
> rails controlled by the EC (and/or always on).
> Moreover, include the MT6359 PMIC devicetree and add some configuration
> for its regulators, essential to keep the machine alive after booting.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  .../boot/dts/mediatek/mt8195-cherry.dtsi      | 102 ++++++++++++++++++
>  1 file changed, 102 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> index 14f8f30b1eb3..091338f7d5ff 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> @@ -5,6 +5,7 @@
>  
>  #include <dt-bindings/gpio/gpio.h>
>  #include "mt8195.dtsi"
> +#include "mt6359.dtsi"
>  
>  / {
>  	aliases {
> @@ -19,6 +20,107 @@ memory@...00000 {
>  		device_type = "memory";
>  		reg = <0 0x40000000 0 0x80000000>;
>  	};
> +
> +	/* system wide LDO 3.3V power rail */
> +	pp3300_z5: regulator-3v3-pp3300-ldo-z5 {

I wouldn't have both "3v3" and "pp3300" in the node name since they mean the
same thing, but feel free to ignore this comment :).

> +		compatible = "regulator-fixed";
> +		regulator-name = "pp3300_ldo_z5";
> +		regulator-always-on;
> +		regulator-boot-on;
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		vin-supply = <&ppvar_sys>;
> +	};
> +
> +	/* separately switched 3.3V power rail */
> +	pp3300_s3: regulator-3v3-pp3300-s3 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "pp3300_s3";
> +		/* automatically sequenced by PMIC EXT_PMIC_EN2 */
> +		regulator-always-on;
> +		regulator-boot-on;

Missing regulator-min/max-microvolt?

> +		vin-supply = <&pp3300_z2>;
> +	};
[..]
> -- 
> 2.35.1
> 

Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Thanks,
Nícolas