Re: [PATCH] dts: riscv: spacemit: k3: add P1 PMIC regulator tree

[Yixun Lan]

Hi Krzysztof, 

On 14:54 Wed 25 Mar     , Krzysztof Kozlowski wrote:
> On 25/03/2026 10:56, Yixun Lan wrote:
> > Add the P1 PMIC's regulator topology tree for pico-itx board.
> > 
> > Signed-off-by: Yixun Lan <dlan@xxxxxxxxxx>
> > ---
> > This series try to add a regulator power tree from P1 PMIC,
> > the PMIC is controlled via an I2C interface.
> > 
> > To test this patch, it will need the I2C patch series [1]
> > 
> > Link: https://lore.kernel.org/all/20260325-02-k3-i2c-v1-0-78f29c83d9ac@xxxxxxxxxx [1]
> > ---
> >  arch/riscv/boot/dts/spacemit/k3-pico-itx.dts | 185 +++++++++++++++++++++++++++
> >  arch/riscv/boot/dts/spacemit/k3-pinctrl.dtsi |  11 ++
> >  2 files changed, 196 insertions(+)
> > 
> > diff --git a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> > index b098dbd0e7a1..5b59c569dbde 100644
> > --- a/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> > +++ b/arch/riscv/boot/dts/spacemit/k3-pico-itx.dts
> > @@ -23,6 +23,191 @@ memory@100000000 {
> >  		device_type = "memory";
> >  		reg = <0x1 0x00000000 0x4 0x00000000>;
> >  	};
> > +
> > +	reg_dc_in: regulator-dc-in-12v {
> > +		compatible = "regulator-fixed";
> > +		regulator-name = "dc_in_12v";
> > +		regulator-min-microvolt = <12000000>;
> > +		regulator-max-microvolt = <12000000>;
> > +		regulator-boot-on;
> > +		regulator-always-on;
> > +	};
> 
> This is a pointless supply. It's non-controllable and serves no devices,
Yes.. I thought to describe a more complete regulator tree, it just
shows more information - e.g. from $debugfs/regulator_summary

> so it only bloats the DTB and slows down boot process without any benefits.
Ok, I will drop it then
> 
> 
> 
> > +
> > +	reg_aux_vcc3v3: regulator-aux-vcc3v3 {
> 
> This is even more pointless because there is no user. Dead code.
> 
reg_aux_vcc3v3 is used by various devices, but I can drop it too,
leaves till there is device really needed..

> > +		compatible = "regulator-fixed";
> > +		regulator-name = "AUX_VCC3V3";
> > +		regulator-min-microvolt = <3300000>;
> > +		regulator-max-microvolt = <3300000>;
> > +		regulator-always-on;
> > +		vin-supply = <&reg_dc_in>;
> > +	};
> > 
> 
> 
> Best regards,
> Krzysztof

-- 
Yixun Lan (dlan)