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Subject: Re: [PATCH v4 09/13] ARM: dts: sun8i: r40: add sata node
From:   Icenowy Zheng <icenowy@aosc.io>
To:     Chen-Yu Tsai <wens@csie.org>,
        LABBE Corentin <clabbe.montjoie@gmail.com>
Cc:     axboe@kernel.dk, Mark Rutland <mark.rutland@arm.com>,
        devicetree <devicetree@vger.kernel.org>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Kishon Vijay Abraham I <kishon@ti.com>,
        linux-ide@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>,
        linux-sunxi <linux-sunxi@googlegroups.com>,
        Rob Herring <robh+dt@kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Date:   Fri, 31 Aug 2018 20:57:56 +0800
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在 2018-08-31五的 19:10 +0800，Chen-Yu Tsai写道：
> On Fri, Aug 31, 2018 at 5:29 PM Corentin Labbe
> <clabbe.montjoie@gmail.com> wrote:
> > 
> > On Fri, Aug 31, 2018 at 03:58:34PM +0800, Chen-Yu Tsai wrote:
> > > On Fri, Aug 31, 2018 at 3:56 PM Corentin Labbe
> > > <clabbe.montjoie@gmail.com> 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@aosc.io>
> > > > > > Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.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@1c18000 {
> > > > > > +                   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@1c180c0  {
> > > > > > +                   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@e90000 
> > > > phy@e900a0)
> > > > But since it is not a good justification, it seems that regmap
> > > > is my only solution ?
> > > 
> > > Since you are effectively splitting one device node into two, you
> > > should
> > > adjust the original (ahci) device nodes register range.
> > > 
> > 
> > I cannot do that if I remove patch 13, iow If I keep phy init code
> > in both place as you requested.
> 
> Then you need to split the phy handling between a10 and r40. A10
> doesn't
> need phy-supply at the moment anyway. And migrating A10 to newer
> binding
> is only causing you problems anyway. Just drop that part, and handle
> the
> R40.

From the hardware perspective, they're the same. The A10/A20 has also
two dedicated VDD pins for SATA, although on boards they're usually
always on.

> 
> ChenYu
> 
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