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

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Message-ID: <20201202094202.GV4077@smile.fi.intel.com>
Date:   Wed, 2 Dec 2020 11:42:02 +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,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH 18/18] ipu3: Add driver for dummy INT3472 ACPI device

On Tue, Dec 01, 2020 at 09:05:11PM +0000, Dan Scally wrote:
> On 01/12/2020 19:21, Andy Shevchenko wrote:
> > On Tue, Dec 01, 2020 at 09:06:38PM +0200, Laurent Pinchart wrote:

...

> > I would rather ask Hans' opinion since he has quite an expertise with DMI for
> > good and bad.
> >
> I have no real preference as to the current method or DMI, but thoughts
> that come to mind are:
> 
> 
> 1. given your info that low byte 0x0c means clock enable, we need to
> register a clock too. Do we need to extend this device specific section
> to map a clock name, or is it acceptable for them to be nameless (ISTR
> that the API will let you fetch a clock using devm_clock_get(dev, NULL);)
> 
> 2. Given only 0x0b pin is actually a regulator and it's controlling
> multiple devices, my plan when we got round to adding the VCM / EEPROM
> support was simply to extend those mapping tables so that those
> supplementary devices were also able to get that regulator...and the two
> would share it. I think, from reading the regulator code and
> documentation, that that's all fine - and it won't actually be disabled
> until both drivers disable it. Does that sound about right?

Sounds right. Next step is to see the code. :-)

-- 
With Best Regards,
Andy Shevchenko