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

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Date:   Sat, 14 Oct 2017 20:00:52 +0800
From:   icenowy@...c.io
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     devicetree@...r.kernel.org,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/2] dt-bindings: add device tree binding for Allwinner
 XR819 SDIO Wi-Fi

在 2017-10-05 14:58，Kalle Valo 写道：
> Icenowy Zheng <icenowy@...c.io> writes:
> 
>> 于 2017年10月4日 GMT+08:00 下午6:11:45, Maxime Ripard
>> <maxime.ripard@...e-electrons.com> 写到:
>>> 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.
>> 
>> The cw1200 driver seems to still have some legacy platform
>> data. Maybe they should also be convert to DT.
>> (Or maybe compatible = "allwinner,xr819" is enough, as
>> xr819 is a specified variant of cw1200 family)
> 
> Ah, so the upstream cw1200 driver supports xr819? Has anyone tested
> that? Or does cw1200 more changes than just adding the DT support?

The support of XR819 in CW1200 driver is far more difficult than I
imagined -- the codedrop used in the mainlined CW1200 driver seems to
be so old that it's before XR819 (which seems to be based on CW1160),
and there's a large number of problems to adapt it to a modern CW1200
variant.

P.S. could you apply this device tree binding patch now?