mfd: arizona-spi: Add Android board ACPI table handling

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: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220307173844.199135-2-hdegoede@redhat.com

diff --git a/drivers/mfd/arizona-spi.c b/drivers/mfd/arizona-spi.c
index 6f80764..16a6751 100644 (file)
--- a/drivers/mfd/arizona-spi.c
+++ b/drivers/mfd/arizona-spi.c
@@ -81,6 +81,30 @@ static int arizona_spi_acpi_windows_probe(struct arizona *arizona)
        return 0;
 }
 
+/* For ACPI tables from boards which ship with Android as factory OS */
+static int arizona_spi_acpi_android_probe(struct arizona *arizona)
+{
+       int ret;
+
+       /*
+        * Get the reset GPIO, treating -ENOENT as -EPROBE_DEFER to wait for
+        * the x86-android-tablets module to register the board specific GPIO
+        * lookup table.
+        */
+       arizona->pdata.reset = devm_gpiod_get(arizona->dev, "reset", GPIOD_OUT_LOW);
+       if (IS_ERR(arizona->pdata.reset)) {
+               ret = PTR_ERR(arizona->pdata.reset);
+               if (ret == -ENOENT) {
+                       dev_info_once(arizona->dev,
+                                     "Deferring probe till GPIO lookup is registered\n");
+                       ret = -EPROBE_DEFER;
+               }
+               return dev_err_probe(arizona->dev, ret, "getting reset GPIO\n");
+       }
+
+       return 0;
+}
+
 /*
  * The AOSP 3.5 mm Headset: Accessory Specification gives the following values:
  * Function A Play/Pause:           0 ohm
@@ -102,9 +126,14 @@ static const struct arizona_micd_range arizona_micd_aosp_ranges[] = {
 
 static int arizona_spi_acpi_probe(struct arizona *arizona)
 {
+       struct acpi_device *adev = ACPI_COMPANION(arizona->dev);
        int ret;
 
-       ret = arizona_spi_acpi_windows_probe(arizona);
+       if (acpi_dev_hid_uid_match(adev, "10WM5102", NULL))
+               ret = arizona_spi_acpi_android_probe(arizona);
+       else
+               ret = arizona_spi_acpi_windows_probe(arizona);
+
        if (ret)
                return ret;
 
@@ -142,6 +171,10 @@ static const struct acpi_device_id arizona_acpi_match[] = {
                .id = "WM510205",
                .driver_data = WM5102,
        },
+       {
+               .id = "10WM5102",
+               .driver_data = WM5102,
+       },
        { }
 };
 MODULE_DEVICE_TABLE(acpi, arizona_acpi_match);