netdev - Re: [PATCH 2/3] dtb: change binding name to match with newer firmware DT

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Message-ID: <20150302144858.GG16779@leverpostej>
Date:	Mon, 2 Mar 2015 14:48:58 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Iyappan Subramanian <isubramanian@....com>
Cc:	Arnd Bergmann <arnd@...db.de>, David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"mlangsdo@...hat.com" <mlangsdo@...hat.com>,
	patches <patches@....com>, Keyur Chudgar <kchudgar@....com>
Subject: Re: [PATCH 2/3] dtb: change binding name to match with newer
 firmware DT

On Fri, Feb 27, 2015 at 11:52:54PM +0000, Iyappan Subramanian wrote:
> On Fri, Feb 27, 2015 at 12:33 PM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Friday 27 February 2015 12:08:29 Iyappan Subramanian wrote:
> >> diff --git a/arch/arm64/boot/dts/apm/apm-storm.dtsi b/arch/arm64/boot/dts/apm/apm-storm.dtsi
> >> index f1ad9c2..a857794 100644
> >> --- a/arch/arm64/boot/dts/apm/apm-storm.dtsi
> >> +++ b/arch/arm64/boot/dts/apm/apm-storm.dtsi
> >> @@ -622,7 +622,7 @@
> >>                 };
> >>
> >>                 sgenet0: ethernet@...10000 {
> >> -                       compatible = "apm,xgene-enet";
> >> +                       compatible = "apm,xgene1-sgenet";
> >>                         status = "disabled";
> >>                         reg = <0x0 0x1f210000 0x0 0xd100>,
> >>                               <0x0 0x1f200000 0x0 0Xc300>,
> >>
> >
> > This will break booting the new dtb on older kernels, right?
> 
> This will not break booting older kernels.  In fact, this will fix it,
> by having the specific binding,
> older kernel that does not have support for these interfaces, will not
> call probe.
> 
> For example, 3.17 kernel that does not have support for SGMII based 1G
> and XFI 10G interfaces
> will not probe these interfaces when booted with newer dtb.

I'm guessing that in the existing DTBs, these nodes are always disabled?

If that's the case then we don't have a problem; we'll never probe these
nodes for an existing DTB.

Mark.
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