linux-kernel - Re: [PATCH 2/2] mfd: arizona-spi: Add Android board ACPI table handling

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Message-ID: <20220228113546.GJ38351@ediswmail.ad.cirrus.com>
Date:   Mon, 28 Feb 2022 11:35:46 +0000
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     Hans de Goede <hdegoede@...hat.com>
CC:     Lee Jones <lee.jones@...aro.org>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mfd: arizona-spi: Add Android board ACPI table
 handling

On Wed, Feb 23, 2022 at 02:42:22PM +0100, Hans de Goede wrote:
> x86/ACPI boards with an arizona WM5102 codec ship with either Windows or
> Android as factory installed OS.
> 
> The ACPI fwnode for the codec on Android boards misses 2 things compared
> to the Windows boards (this is hardcoded in the Android board kernels):
> 
> 1. There is no CLKE ACPI method to enabe the 32 KHz clock the codec needs
>    for jack-detection.
> 
> 2. The GPIOs used by the codec are not listed in the fwnode for the codec.
> 
> The ACPI tables on x86/ACPI boards shipped with Android being incomplete
> happens a lot. The special drivers/platform/x86/x86-android-tablets.c
> module contains DMI based per model handling to compensate for this.
> 
> This module will enable the 32KHz clock through the pinctrl framework
> to fix 1. and it will also register a gpio-lookup table for all GPIOs
> needed by the codec + machine driver, including the GPIOs coming from
> the codec itself.
> 
> Add an arizona_spi_acpi_android_probe() function which waits for the
> x86-android-tablets to have set things up before continue with probing
> the arizona WM5102 codec.
> 
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---

Acked-by: Charles Keepax <ckeepax@...nsource.cirrus.com>

Thanks,
Charles