• Hans de Goede's avatar
    mfd: arizona-spi: Add Android board ACPI table handling · 9ed55e9a
    Hans de Goede authored
    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.
    Acked-by: default avatarCharles Keepax <ckeepax@opensource.cirrus.com>
    Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
    Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
    Link: https://lore.kernel.org/r/20220307173844.199135-2-hdegoede@redhat.com
    9ed55e9a
arizona-spi.c 8.3 KB