linux-kernel - Re: [PATCH v3 1/2] dt-bindings: add device tree binding for Allwinner XR819 SDIO Wi-Fi

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Date:   Wed, 4 Oct 2017 12:11:45 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Arend van Spriel <arend.vanspriel@...adcom.com>
Cc:     Icenowy Zheng <icenowy@...c.io>, Kalle Valo <kvalo@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v3 1/2] dt-bindings: add device tree binding for
 Allwinner XR819 SDIO Wi-Fi

On Wed, Oct 04, 2017 at 10:02:48AM +0000, Arend van Spriel wrote:
> On 10/4/2017 11:03 AM, Icenowy Zheng wrote:
> > 
> > 
> > 于 2017年10月4日 GMT+08:00 下午5:02:17, Kalle Valo <kvalo@...eaurora.org> 写到:
> > > Icenowy Zheng <icenowy@...c.io> writes:
> > > 
> > > > Allwinner XR819 is a SDIO Wi-Fi chip, which has the functionality to
> > > use
> > > > an out-of-band interrupt pin instead of SDIO in-band interrupt.
> > > > 
> > > > Add the device tree binding of this chip, in order to make it
> > > possible
> > > > to add this interrupt pin to device trees.
> > > > 
> > > > Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> > > > Acked-by: Rob Herring <robh@...nel.org>
> > > > ---
> > > > Changes in v3:
> > > > - Renames the node name.
> > > > - Adds ACK from Rob.
> > > > Changes in v2:
> > > > - Removed status property in example.
> > > > - Added required property reg.
> > > > 
> > > >   .../bindings/net/wireless/allwinner,xr819.txt      | 38
> > > ++++++++++++++++++++++
> > > >   1 file changed, 38 insertions(+)
> > > >   create mode 100644
> > > Documentation/devicetree/bindings/net/wireless/allwinner,xr819.txt
> > > 
> > > Like I asked already last time, AFAICS there is no upstream xr819
> > > wireless driver in drivers/net/wireless directory. Do we still accept
> > > bindings like this for out-of-tree drivers?
> > 
> > See esp8089.
> > 
> > There's also no in-tree driver for it.
> 
> The question is whether we should. The above might be a precedent, but it
> may not necessarily be the way to go. The commit message for esp8089 seems
> to hint that there is intent to have an in-tree driver:
> 
> """
>     Note that at this point there only is an out of tree driver for this
>     hardware, there is no clear timeline / path for merging this. Still
>     I believe it would be good to specify the binding for this in tree
>     now, so that any future migration to an in tree driver will not cause
>     compatiblity issues.
> 
>     Cc: Icenowy Zheng <icenowy@...c.xyz>
>     Signed-off-by: Hans de Goede <hdegoede@...hat.com>
>     Signed-off-by: Rob Herring <robh@...nel.org>
> """
> 
> Regardless the bindings are in principle independent of the kernel and just
> describing hardware. I think there have been discussions to move the
> bindings to their own repository, but apparently it was decided otherwise.

Yeah, I guess especially how it could be merged with the cw1200 driver
would be very relevant to that commit log.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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