linux-kernel - Re: [PATCH v2 00/20] power-suppy/i2c/extcon: Fix charger setup on Xiaomi Mi Pad 2 and Lenovo Yogabook

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Message-ID: <684c11bc-3703-1de9-3073-96701405cd2c@redhat.com>
Date:   Tue, 16 Nov 2021 12:05:02 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Sebastian Reichel <sre@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Ard Biesheuvel <ardb@...nel.org>, Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Yauhen Kharuzhy <jekhor@...il.com>,
        Tsuchiya Yuto <kitakar@...il.com>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v2 00/20] power-suppy/i2c/extcon: Fix charger setup on
 Xiaomi Mi Pad 2 and Lenovo Yogabook

Hi,

On 11/16/21 12:00, Andy Shevchenko wrote:
> On Sun, Nov 14, 2021 at 7:03 PM Hans de Goede <hdegoede@...hat.com> wrote:
>>
>> Hi All,
>>
>> This is version 2 of my series previously titled:
>> "[PATCH 00/13] power-suppy/i2c/extcon: Add support for cht-wc PMIC
>> without USB-PD support".
>>
>> So far almost all the kernel code surrounding the Cherry Trail Whiskey Cove
>> PMIC has been developed on the GPD win / pocket devices and it has various
>> assumption based on that. In the mean time I've learned (and gotten access
>> to) about 2 more designs and none of the 3 now known designs use a single
>> standard setup for the charger, fuel-gauge and other chips surrounding the
>> PMIC / charging+data USB port:
>>
>> 1. The GPD Win and GPD Pocket mini-laptops, these are really 2 models
>> but the Pocket re-uses the GPD Win's design in a different housing:
>>
>> The WC PMIC is connected to a TI BQ24292i charger, paired with
>> a Maxim MAX17047 fuelgauge + a FUSB302 USB Type-C Controller +
>> a PI3USB30532 USB switch, for a fully functional Type-C port.
>>
>> 2. The Xiaomi Mi Pad 2:
>>
>> The WC PMIC is connected to a TI BQ25890 charger, paired with
>> a TI BQ27520 fuelgauge, using the TI BQ25890 for BC1.2 charger type
>> detection, for a USB-2 only Type-C port without PD.
>>
>> 3. The Lenovo Yoga Book YB1-X90 / Lenovo Yoga Book YB1-X91 series:
>>
>> The WC PMIC is connected to a TI BQ25892 charger, paired with
>> a TI BQ27542 fuelgauge, using the WC PMIC for BC1.2 charger type
>> detection and using the BQ25892's Mediatek Pump Express+ (1.0)
>>
>> ###
>>
>> Unlike what is normal on X86 this diversity in designs is not handled /
>> abstracted away by the ACPI tables.
> 
> I will briefly look into it, right now two observations (or nit-picks):

Thank you.

> - you may utilize Co-developed-by tag when it makes sense

Right, I intended to do so in patch 13/20, but I now see that I
somehow forgot that :)

> - I would rather see "x86/ACPI" in all texts (note small "x")

Ack.

Regards,

Hans