linux-kernel - Re: [PATCH 18/18] ipu3: Add driver for dummy INT3472 ACPI device

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Date:   Tue, 1 Dec 2020 00:05:11 +0000
From:   Dan Scally <djrscally@...il.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Sakari Ailus <sakari.ailus@....fi>, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-media@...r.kernel.org,
        devel@...ica.org, rjw@...ysocki.net, lenb@...nel.org,
        gregkh@...uxfoundation.org, mika.westerberg@...ux.intel.com,
        andriy.shevchenko@...ux.intel.com, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, wsa@...nel.org, yong.zhi@...el.com,
        sakari.ailus@...ux.intel.com, bingbu.cao@...el.com,
        tian.shu.qiu@...el.com, mchehab@...nel.org, robert.moore@...el.com,
        erik.kaneda@...el.com, pmladek@...e.com, rostedt@...dmis.org,
        sergey.senozhatsky@...il.com, linux@...musvillemoes.dk,
        kieran.bingham+renesas@...asonboard.com, jacopo+renesas@...ndi.org,
        laurent.pinchart+renesas@...asonboard.com,
        jorhand@...ux.microsoft.com, kitakar@...il.com,
        heikki.krogerus@...ux.intel.com
Subject: Re: [PATCH 18/18] ipu3: Add driver for dummy INT3472 ACPI device


On 30/11/2020 23:21, Laurent Pinchart wrote:
>>> Instead, I propose, that you add this as an option to the tps68470 driver
>>> that figures out whether the ACPI device for the tps68470 device actually
>>> describes something else, in a similar fashion you do with the cio2-bridge
>>> driver. I think it may need a separate Kconfig option albeit this and
>>> cio2-bridge cannot be used separately.
>> It actually occurs to me that that may not work (I know I called that
>> out as an option we considered, but that was a while ago actually). The
>> reason I wasn't worried about the existing tps68470 driver binding to
>> these devices is that it's an i2c driver, and these dummy devices don't
>> have an I2cSerialBusV2, so no I2C device is created by them the kernel.
>>
>> Won't that mean the tps68470 driver won't ever be probed for these devices?
> I think we can create a platform driver in that case. The same module
> can register multiple drivers (platform and I2C).
Ah, I follow. OK, that's an option then.