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

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Message-ID: <59D4B1C8.8020105@broadcom.com>
Date:   Wed, 4 Oct 2017 12:02:48 +0200
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Icenowy Zheng <icenowy@...c.io>, Kalle Valo <kvalo@...eaurora.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        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 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.

Regards,
Arend