netdev - Re: [PATCHv4] wlcore: add wl1285 compatible

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Date:   Tue, 23 May 2017 20:29:41 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        David Miller <davem@...emloft.net>,
        Tony Lindgren <tony@...mide.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCHv4] wlcore: add wl1285 compatible

Hi,

On Mon, May 22, 2017 at 11:50:04AM -0500, Rob Herring wrote:
> [...]
> >> >> Thanks, I'll take it then. Not sure why Sebastian was suggested to
> >> >> submit this patch via your tree in the first place.
> >> >>
> >> >> https://patchwork.kernel.org/patch/9713645/
> >> >
> >> > Thanks. The idea was to get into early 4.12-rc to avoid merge
> >> > conflicts in the droid 4 *.dts during 4.13 cycle. This strategy
> >> > obviously failed :)
> >>
> >> First, I'm not sure why you combined everything. A maintainer can just
> >> as easily take a series as a single patch and we prefer binding doc,
> >> dts and driver changes all separate.
> >>
> >> Second, the dts changes could go thru arm-soc and the driver change
> >> thru netdev. The binding doc can be thru either. There's no bisecting
> >> dependency and things shouldn't break. It just won't all work until
> >> you have both branches.
> >
> > This is only true for new devices. WLAN for droid4 works at the
> > moment using incorrect compatible string. If *.dts is updated and
> > driver is not yet updated WLAN does not work. IMHO that is a
> > bisecting dependency.
> 
> True. That's also breaking compatibility if a new kernel doesn't work
> with an old DT.

This way around works. It's the other way around, that does not work
(new DT with old kernel).

> Is it just a compatible string change? If so, then just keep the
> old string as a fallback.

That should work.

-- Sebastian

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