linux-kernel - Re: [PATCH 11/13] i2c: cht-wc: Add support for devices using a bq25890 charger

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Date:   Sun, 31 Oct 2021 18:58:37 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Sebastian Reichel <sre@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Yauhen Kharuzhy <jekhor@...il.com>,
        Tsuchiya Yuto <kitakar@...il.com>,
        platform-driver-x86@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-efi@...r.kernel.org
Subject: Re: [PATCH 11/13] i2c: cht-wc: Add support for devices using a
 bq25890 charger

On Sat, Oct 30, 2021 at 08:28:11PM +0200, Hans de Goede wrote:
> The i2c-controller on the Cherry Trail - Whiskey Cove PMIC is special
> in that it is always connected to the I2C charger IC of the board on
> which the PMIC is used; and the charger IC is not described in ACPI,
> so the i2c-cht-wc code needs to instantiate an i2c-client for it itself.
> 
> So far there has been a rudimentary check to make sure the ACPI tables
> are at least somewhat as expected by checking for the presence of an
> INT33FE device and sofar the code has assumed that if this INT33FE
> device is present that the used charger then is a bq24290i.
> 
> But some boards with an INT33FE device in their ACPI tables use a
> different charger IC and some boards don't have an INT33FE device at all.
> 
> Since the information about the used charger + fuel-gauge + other chips is
> necessary in other places too, the kernel now adds a "intel,cht-wc-setup"
> string property to the Whiskey Cove PMIC i2c-client based on DMI matching,
> which reliably describes the board's setup of the PMIC.
> 
> Switch to using the "intel,cht-wc-setup" property and add support for
> instantiating an i2c-client for either a bq24292i or a bq25890 charger.
> 
> This has been tested on a GPD pocket (which uses the old bq24292i setup)
> and on a Xiaomi Mi Pad 2 with a bq25890 charger.
> 
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>

In general, fine with me from the I2C side:

Acked-by: Wolfram Sang <wsa@...nel.org>


> +	else if (!strcmp(str, "bq24292i,max17047,fusb302,pi3usb30532"))
> +		board_info = &bq24190_board_info;
> +	else if (!strcmp(str, "bq25890,bq27520"))
> +		board_info = &bq25890_board_info;

Very minor nit: I prefer 'strcmp() == 0' because the above could be read
as 'if not strcmp()' which is sadly misleading. But I am not strict with
it.


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