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

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Message-ID: <20201202093952.GU4077@smile.fi.intel.com>
Date:   Wed, 2 Dec 2020 11:39:52 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Dan Scally <djrscally@...il.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        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, 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 Tue, Dec 01, 2020 at 08:59:53PM +0000, Dan Scally wrote:
> On 01/12/2020 18:49, Andy Shevchenko wrote:

...

> > Seems we can do this, by locating intel_int3472.c under PDx86 hood and dropping
> > ACPI ID table from TPS68470 MFD driver. The PMIC can be instantiated via
> > i2c_acpi_new_device() (IIRC the API name).
> >
> > And actually it makes more sense since it's not and MFD and should not be there.
> >
> > (Dan, patch wise the one creates intel_int3472.c followed by another one that
> >  moves ACPI ID from PMIC and introduces its instantiation via I²C board info
> >  structure)
> 
> I'm mostly following this, but why would we need an i2c_board_info or
> i2c_acpi_new_device()? The INT3472 entries that refer to actual tps68470
> devices do have an I2cSerialBusV2 enumerated in _CRS so in their case
> there's an i2c device registered with the kernel already.

Because as we discussed already we can't have two drivers for the same ID
without a big disruption in the driver(s).

If you have a single point of enumeration, it will make things much easier
(refer to the same intel_cht_int33fe driver you mentioned earlier).

I just realize that the name of int3472 should follow the same pattern, i.e.
intel_skl_int3472.c

> I think we need those things when we get round to handling the
> VCM/EEPROM that's hidden within the sensor's ACPI entry, but I've not
> done any work on that yet at all.

Let's consider this later — one step at a time.

-- 
With Best Regards,
Andy Shevchenko