linux-kernel - Re: [PATCH v4 10/11] platform/x86: int3472: Pass tps68470_regulator_platform

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Date:   Mon, 1 Nov 2021 12:31:57 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Kate Hsuan <hpa@...hat.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v4 10/11] platform/x86: int3472: Pass
 tps68470_regulator_platform_data to the tps68470-regulator MFD-cell

Hi,

On 10/25/21 13:38, Andy Shevchenko wrote:
> On Mon, Oct 25, 2021 at 12:42 PM Hans de Goede <hdegoede@...hat.com> wrote:
>>
>> Pass tps68470_regulator_platform_data to the tps68470-regulator
>> MFD-cell, specifying the voltages of the various regulators and
>> tying the regulators to the sensor supplies so that sensors which use
>> the TPS68470 can find their regulators.
>>
>> Since the voltages and supply connections are board-specific, this
>> introduces a DMI matches int3472_tps68470_board_data struct which
>> contains the necessary per-board info.
>>
>> This per-board info also includes GPIO lookup information for the
>> sensor GPIOs which may be connected to the tps68470 gpios.
> 
> gpios --> GPIO lines

Fixed for v5.


> ...
> 
>> +       board_data = int3472_tps68470_get_board_data(dev_name(&client->dev));
> 
>> +       if (board_data)
> 
> IIRC it's a dup. Below already incorporates this.
> 
>> +               gpiod_remove_lookup_table(board_data->tps68470_gpio_lookup_table);

Not sure what you mean here? This line *dereferences* board_data, so even if
gpiod_remove_lookup_table() already contains a NULL check for the table pointer,
we still need the board_data check to avoid dereferencing it to get
the tps68470_gpio_lookup_table member.

Regards,

Hans