linux-kernel - Re: [PATCHv4] wlcore: add wl1285 compatible

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Message-ID: <20170522162114.w4pw25pcecsm6lhi@earth>
Date:   Mon, 22 May 2017 18:21:15 +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 11:11:49AM -0500, Rob Herring wrote:
> On Mon, May 22, 2017 at 10:21 AM, Sebastian Reichel
> <sebastian.reichel@...labora.co.uk> wrote:
> > Hi,
> >
> > On Mon, May 22, 2017 at 05:44:24PM +0300, Kalle Valo wrote:
> >> David Miller <davem@...emloft.net> writes:
> >> > From: Kalle Valo <kvalo@...eaurora.org>
> >> > Date: Mon, 22 May 2017 12:28:20 +0300
> >> >
> >> >> Sebastian Reichel <sebastian.reichel@...labora.co.uk> writes:
> >> >>
> >> >>> Motorola Droid 4 uses a WL1285C. With differences between the
> >> >>> chips not being public let's add explicit binding for wl1285
> >> >>> instead of relying on wl1283 being very similar.
> >> >>>
> >> >>> Reviewed-by: Rob Herring <robh@...nel.org>
> >> >>> Acked-by: Kalle Valo <kvalo@...eaurora.org>
> >> >>> Acked-by: Tony Lindgren <tony@...mide.com>
> >> >>> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
> >> >>> ---
> >> >>> Hi Dave,
> >> >>>
> >> >>> I previously send this in two patches, but its hard to apply without
> >> >>> requiring multiple kernel releases (the driver must be updated before
> >> >>> the DTS change). Since the actual change is not very complex Marcel
> >> >>> Holtmann & Tony Lindgren suggested, that I send this directly to you
> >> >>> in a single patch for inclusion into 4.12. This also means, that the
> >> >>> remaining series can be queued normally for 4.13.
> >> >>
> >> >> I noticed that Dave set this patch to Awaiting Upstream state on his
> >> >> patchwork:
> >> >>
> >> >> https://patchwork.ozlabs.org/patch/759042/
> >> >>
> >> >> Which makes me suspect that he is waiting me to apply this (as I
> >> >> normally apply wlcore patches). Dave, should I actually take this patch?
> >> >> What do you prefer?
> >> >
> >> > Anything that touches wireless drivers I defer to you, yes.
> >>
> >> 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.

It would have been fine to sneak the driver change into 4.12 and
queue the *.dts change in 4.13, though. IIRC Tony suggest to make
it one patch.

-- Sebastian

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