linux-kernel - Re: [PATCH 05/12] regulator: Introduce tps68470-regulator driver

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Date:   Fri, 15 Oct 2021 21:48:24 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Daniel Scally <djrscally@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Len Brown <lenb@...nel.org>,
        linux-acpi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Kate Hsuan <hpa@...hat.com>, linux-media@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH 05/12] regulator: Introduce tps68470-regulator driver

Hi,

On 10/15/21 9:40 PM, Mark Brown wrote:
> On Fri, Oct 15, 2021 at 09:27:50PM +0200, Hans de Goede wrote:
>> On 10/15/21 8:58 PM, Mark Brown wrote:
> 
>>> I am very confused about why it's in the driver without a DMI quirk
>>> and/or clear comments about why and saying that this is a terrible
>>> example to copy.
> 
>> The DMI quirks live in the ACPI glue code under drivers/platform/x86,
>> that code instantiates the MFD cell and sets the platform-data
>> as part of the cell.
> 
> I can't see how the quirking gets propagated through into the driver and
> I'd really expect that in a situation like this the platform data would
> be passed through as platform data from the code doing the quirks,

That is exactly what is happening here. The platform_data in this
case is just an array of regulator_init_data pointers (one per
regulator in the PMIC):

struct tps68470_regulator_platform_data {
        const struct regulator_init_data *reg_init_data[TPS68470_NUM_REGULATORS];
};

This struct gets filled by platform specific code under drivers/platform/x86
(in later patches in the series).

And the regulator code in this patch consumes this like this:

                if (pdata && pdata->reg_init_data[i])
                        config.init_data = pdata->reg_init_data[i];
                else
                        config.init_data = &tps68470_init[i];

                rdev = devm_regulator_register(&pdev->dev, &regulators[i], &config);

So we have the code doing the quirks determining the regulator_init_data
and passing this through platform_data, which AFAICT is exactly what
you want?

Regards,

Hans