linux-kernel - Re: [PATCH v7 3/3] arm64: dts: reset: add microchip sparx5 switch reset driver

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Message-ID: <319ae8336916458f416f8ed973feafcbed701b48.camel@microchip.com>
Date:   Tue, 16 Mar 2021 09:36:07 +0100
From:   Steen Hegelund <steen.hegelund@...rochip.com>
To:     Rob Herring <robh@...nel.org>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        Andrew Lunn <andrew@...n.ch>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        "Alexandre Belloni" <alexandre.belloni@...tlin.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v7 3/3] arm64: dts: reset: add microchip sparx5 switch
 reset driver

Hi Rob,

On Mon, 2021-03-08 at 12:59 -0700, Rob Herring wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> On Wed, Mar 03, 2021 at 09:11:58AM +0100, Steen Hegelund wrote:
> > This provides reset driver support for the Microchip Sparx5 PCB134
> > and
> > PCB135 reference boards.
> 
> This still looks like an incompatible change with no explanation.
> 
> What happens on an old kernel that expects "microchip,sparx5-chip-
> reset"
> and doesn't understand "microchip,sparx5-switch-reset"?

Sorry about forgetting that item.
I will add a note to say that this is an incompatible change.
In practice, I do not think the reset driver has really been taken into
use yet.

> 
> > 
> > Signed-off-by: Steen Hegelund <steen.hegelund@...rochip.com>
> > ---
> >  arch/arm64/boot/dts/microchip/sparx5.dtsi | 7 +++++--
> >  1 file changed, 5 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/arm64/boot/dts/microchip/sparx5.dtsi
> > b/arch/arm64/boot/dts/microchip/sparx5.dtsi
> > index 380281f312d8..dc3ada5cf9fc 100644
> > --- a/arch/arm64/boot/dts/microchip/sparx5.dtsi
> > +++ b/arch/arm64/boot/dts/microchip/sparx5.dtsi
> > @@ -132,9 +132,12 @@ mux: mux-controller {
> >                       };
> >               };
> > 
> > -             reset@...010008 {
> > -                     compatible = "microchip,sparx5-chip-reset";
> > +             reset: reset-controller@...010008 {
> > +                     compatible = "microchip,sparx5-switch-reset";
> >                       reg = <0x6 0x11010008 0x4>;
> > +                     reg-names = "gcb";
> > +                     #reset-cells = <1>;
> > +                     cpu-syscon = <&cpu_ctrl>;
> >               };
> > 
> >               uart0: serial@...100000 {
> > --
> > 2.30.1
> > 


-- 
BR
Steen

-=-=-=-=-=-=-=-=-=-=-=-=-=-=
steen.hegelund@...rochip.com