linux-kernel - Re: [PATCH v2 2/3] arm64: dts: allwinner: h6: add r

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Date:   Tue, 23 Apr 2019 18:05:45 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Icenowy Zheng <icenowy@...c.io>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v2 2/3] arm64: dts: allwinner: h6: add r_watchog node

On Fri, Apr 19, 2019 at 09:00:42PM +0200, Clément Péron wrote:
> Hi,
>
> On Thu, 11 Apr 2019 at 17:34, Clément Péron <peron.clem@...il.com> wrote:
> >
> > Allwinner H6 has a r_watchdog similar to A64.
> >
> > Declare it in the device-tree.
> >
> > Signed-off-by: Clément Péron <peron.clem@...il.com>
> > ---
> >  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > index 5c2f5451227b..66dc684a378e 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > @@ -622,6 +622,13 @@
> >                         #reset-cells = <1>;
> >                 };
> >
> > +               r_watchdog: watchdog@...0400 {
> > +                       compatible = "allwinner,sun50i-a64-wdt",
> > +                                    "allwinner,sun6i-a31-wdt";
> > +                       reg = <0x07020400 0x20>;
> > +                       interrupts = <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;
> > +               };
>
> I have set the same compatible as A64 because regarding the User
> Manual they have exactly the same memory mapping.
> However we don't know really if it's the same IP version, maybe there
> will be an errata one day.
> So I would like to know if it's better to define the h6-wdt also
>   compatible =  "allwinner,sun50i-h6-wdt", "allwinner,sun50i-a64-wdt",
>                                  "allwinner,sun6i-a31-wdt";
>
> I would say Yes, but with this logic we would have to had a new
> compatible each time there is a  new SoC.

Why not just having the A31 compatible?

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com