linux-kernel - Re: [PATCH v4 09/13] ARM: dts: sun8i: r40: add sata node

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Date:   Fri, 31 Aug 2018 12:54:12 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     maxime.ripard@...tlin.com
Cc:     axboe@...nel.dk, hdegoede@...hat.com, kishon@...com,
        mark.rutland@....com, robh+dt@...nel.org, wens@...e.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, Icenowy Zheng <icenowy@...c.io>
Subject: Re: [PATCH v4 09/13] ARM: dts: sun8i: r40: add sata node

On Fri, Aug 31, 2018 at 12:20:21PM +0200, maxime.ripard@...tlin.com wrote:
> On Fri, Aug 31, 2018 at 09:56:31AM +0200, Corentin Labbe wrote:
> > On Fri, Aug 31, 2018 at 09:35:00AM +0200, Maxime Ripard wrote:
> > > On Thu, Aug 30, 2018 at 09:01:16PM +0200, Corentin Labbe wrote:
> > > > R40 have a sata controller which is the same as A20.
> > > > This patch adds a DT node for it.
> > > > 
> > > > Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> > > > Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> > > > ---
> > > >  arch/arm/boot/dts/sun8i-r40.dtsi | 23 +++++++++++++++++++++++
> > > >  1 file changed, 23 insertions(+)
> > > > 
> > > > diff --git a/arch/arm/boot/dts/sun8i-r40.dtsi b/arch/arm/boot/dts/sun8i-r40.dtsi
> > > > index 852c2ccc3268..d6b5820da850 100644
> > > > --- a/arch/arm/boot/dts/sun8i-r40.dtsi
> > > > +++ b/arch/arm/boot/dts/sun8i-r40.dtsi
> > > > @@ -550,6 +550,29 @@
> > > >  			#size-cells = <0>;
> > > >  		};
> > > >  
> > > > +		ahci: sata@...8000 {
> > > > +			compatible = "allwinner,sun8i-r40-ahci";
> > > > +			reg = <0x01c18000 0x1000>;
> > > > +			interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
> > > > +			clocks = <&ccu CLK_BUS_SATA>, <&ccu CLK_SATA>;
> > > > +			resets = <&ccu RST_BUS_SATA>;
> > > > +			resets-name = "ahci";
> > > > +			#address-cells = <1>;
> > > > +			#size-cells = <0>;
> > > > +			status = "disabled";
> > > > +
> > > > +			sata_port: sata-port@0 {
> > > > +				reg = <0>;
> > > > +				phys = <&sata_phy>;
> > > > +			};
> > > > +		};
> > > > +
> > > > +		sata_phy: sata-phy@...80c0  {
> > > > +			compatible = "allwinner,sun8i-r40-sata-phy";
> > > > +			reg = <0x1c180c0 0x200>;
> > > 
> > > Overlapping devices in the DTS is not ok.
> > > 
> > 
> > I do the same than arch/arm/boot/dts/berlin2.dtsi (sata@...000
> > phy@...0a0)
> >
> > But since it is not a good justification, it seems that regmap is my
> > only solution ?
> 
> I'm not even sure why you are moving the phy out of its original node
> (and driver).
> 

For using the phy-supply already handled by the code.
The other choice is to add another xxx-supply to ahci_platform.
Or to use hackily port_regulator for this regulator.