linux-kernel - Re: [PATCH 2/4] dt-bindings: mfd: spacemit,p1: Add individual regulator supply properties

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Message-ID: <20260122122305-GYD63789@gentoo.org>
Date: Thu, 22 Jan 2026 20:23:05 +0800
From: Yixun Lan <dlan@...too.org>
To: Guodong Xu <guodong@...cstar.com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
	Alex Elder <elder@...cstar.com>, Lee Jones <lee@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Troy Mitchell <troy.mitchell@...ux.spacemit.com>,
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	spacemit@...ts.linux.dev, devicetree@...r.kernel.org
Subject: Re: [PATCH 2/4] dt-bindings: mfd: spacemit,p1: Add individual
 regulator supply properties

Hi Guodong,

On 17:43 Thu 22 Jan     , Guodong Xu wrote:
> Add supply properties that match the P1 PMIC's actual hardware topology
> where each buck converter has its own VIN pin and LDO groups share
> common input pins. Supply names are defined according to the pinout
> names in the P1 datasheet.
> 
While checking schematics/docs, I found the SWIN/SWOUT are not
described in the dt-binding? is this intentional? I have no problem
if you plan to implement it separately later, just curious to ask..

In Bananapi F3/Jupiter board, it's used as LCD_VCC5V0 out

> This allows different boards to describe their actual
> power tree connections in devicetree rather than hardcoding supply
> relationships in the driver.
> 
> Signed-off-by: Guodong Xu <guodong@...cstar.com>
> ---
>  .../devicetree/bindings/mfd/spacemit,p1.yaml       | 58 +++++++++++++++++++++-
>  1 file changed, 56 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/spacemit,p1.yaml b/Documentation/devicetree/bindings/mfd/spacemit,p1.yaml
> index c6593ac6ef6adb72fc48af570dc13fc9edf77ccb..abdc93b9a67b1872c8fe6955abd950622a0b69e8 100644
> --- a/Documentation/devicetree/bindings/mfd/spacemit,p1.yaml
> +++ b/Documentation/devicetree/bindings/mfd/spacemit,p1.yaml
> @@ -27,8 +27,41 @@ properties:
>    interrupts:
>      maxItems: 1
>  
> -  vin-supply:
> -    description: Input supply phandle.
> +  vin1-supply:
> +    description:
> +      Power supply for BUCK1. Required if BUCK1 is defined.
> +
> +  vin2-supply:
> +    description:
> +      Power supply for BUCK2. Required if BUCK2 is defined.
> +
> +  vin3-supply:
> +    description:
> +      Power supply for BUCK3. Required if BUCK3 is defined.
> +
> +  vin4-supply:
> +    description:
> +      Power supply for BUCK4. Required if BUCK4 is defined.
> +
> +  vin5-supply:
> +    description:
> +      Power supply for BUCK5. Required if BUCK5 is defined.
> +
> +  vin6-supply:
> +    description:
> +      Power supply for BUCK6. Required if BUCK6 is defined.
> +
> +  aldoin-supply:
> +    description:
> +      Power supply for ALDO1-4. Required if any are defined.
> +
> +  dldoin1-supply:
> +    description:
> +      Power supply for DLDO1-4. Required if any are defined.
> +
> +  dldoin2-supply:
> +    description:
> +      Power supply for DLDO5-7. Required if any are defined.
>  
>    regulators:
>      type: object
> @@ -50,6 +83,15 @@ unevaluatedProperties: false
>  
>  examples:
>    - |
> +    / {
> +        reg_vcc_5v: regulator-vcc-5v {
> +            compatible = "regulator-fixed";
> +            regulator-name = "vcc_5v";
> +            regulator-min-microvolt = <5000000>;
> +            regulator-max-microvolt = <5000000>;
> +        };
> +    };
> +
>      i2c {
>          #address-cells = <1>;
>          #size-cells = <0>;
> @@ -58,6 +100,10 @@ examples:
>              compatible = "spacemit,p1";
>              reg = <0x41>;
>              interrupts = <64>;
> +            vin1-supply = <&reg_vcc_5v>;
> +            vin5-supply = <&reg_vcc_5v>;
> +            aldoin-supply = <&reg_vcc_5v>;
> +            dldoin1-supply = <&buck5>;
>  
>              regulators {
>                  buck1 {
> @@ -68,6 +114,14 @@ examples:
>                      regulator-always-on;
>                  };
>  
> +                buck5: buck5 {
> +                    regulator-name = "buck5";
> +                    regulator-min-microvolt = <500000>;
> +                    regulator-max-microvolt = <3450000>;
> +                    regulator-ramp-delay = <5000>;
> +                    regulator-always-on;
> +                };
> +
>                  aldo1 {
>                      regulator-name = "aldo1";
>                      regulator-min-microvolt = <500000>;
> 
> -- 
> 2.43.0
> 

-- 
Yixun Lan (dlan)