[PATCH 5/7] ASoC: rt5677: Set up ACPI GPIO pins mapping table

[Yauhen Kharuzhy <jekhor@gmail.com>]

To get GPIO configuration from ACPI, define an ACPI GPIO mapping table,
linking GPIO names with CRS entries.

The only known device that has an ACPI entry for the RT5677 codec is
the Lenovo Yoga Book YB1-X91, and it uses this entry to describe the
entire sound system configuration: codec connections and jack detection
chip connections.

This ACPI definition looks YogaBook-specific, but codec GPIOs may be
recognized as generic, so add this lookup table for all devices.

Details about the YogaBook RT5677 ACPI entry are provided below.

CRS resources:
I2C devices:
0: rt5677 codec
1: ts3a227e jack detection IC

GPIOs:
0: rt5677 codec reset
1: rt5677 codec pow-ldo2
2: speaker enable

INTs:
0: rt5677 codec
1: ts3a227e jack detection IC

SPI device:
0: rt5677 codec SPI connection

ACPI decompiled dump fragment:

    Device (RTEK)
    {
        Name (_ADR, Zero)  // _ADR: Address
        Name (_HID, "10EC5677")  // _HID: Hardware ID
        Name (_CID, "10EC5677")  // _CID: Compatible ID
        Name (_DDN, "Realtek IIS Audio Codec")  // _DDN: DOS Device Name
        Name (_SUB, "17AA7005")  // _SUB: Subsystem ID
        Name (_UID, One)  // _UID: Unique ID
        Name (_PR0, Package (0x01)  // _PR0: Power Resources for D0
        {
            CLK3
        })
        Name (CHAN, Package (0x02)
        {
            One,
            0x0124F800
        })
        Method (_CRS, 0, NotSerialized)  // _CRS: Current Resource Settings
        {
            Name (SBUF, ResourceTemplate ()
            {
                I2cSerialBusV2 (0x002C, ControllerInitiated, 0x000186A0,
                    AddressingMode7Bit, "\\_SB.PCI0.I2C1",
                    0x00, ResourceConsumer, , Exclusive,
                    )
                I2cSerialBusV2 (0x003B, ControllerInitiated, 0x000186A0,
                    AddressingMode7Bit, "\\_SB.PCI0.I2C1",
                    0x00, ResourceConsumer, , Exclusive,
                    )
                GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionOutputOnly,
                    "\\_SB.GPO3", 0x00, ResourceConsumer, ,
                    )
                    {   // Pin list
                        0x0019
                    }
                GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionOutputOnly,
                    "\\_SB.GPO3", 0x00, ResourceConsumer, ,
                    )
                    {   // Pin list
                        0x0012
                    }
                GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionOutputOnly,
                    "\\_SB.GPO3", 0x00, ResourceConsumer, ,
                    )
                    {   // Pin list
                        0x0030
                    }
                GpioInt (Edge, ActiveLow, Exclusive, PullNone, 0x0000,
                    "\\_SB.GPO0", 0x00, ResourceConsumer, ,
                    )
                    {   // Pin list
                        0x005B
                    }
                GpioInt (Edge, ActiveLow, Exclusive, PullNone, 0x0000,
                    "\\_SB.GPO0", 0x00, ResourceConsumer, ,
                    )
                    {   // Pin list
                        0x004D
                    }
                SpiSerialBusV2 (0x0001, PolarityLow, FourWireMode, 0x08,
                    ControllerInitiated, 0x003D0900, ClockPolarityHigh,
                    ClockPhaseSecond, "\\_SB.PCI0.SPI1",
                    0x00, ResourceConsumer, , Exclusive,
                    )
            })
            Return (SBUF) /* \_SB_.PCI0.I2C1.RTEK._CRS.SBUF */
        }
    }

Signed-off-by: Yauhen Kharuzhy <jekhor@gmail.com>
---
 sound/soc/codecs/rt5677.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
index 845385c1fb88..f56ac267f53b 100644
--- a/sound/soc/codecs/rt5677.c
+++ b/sound/soc/codecs/rt5677.c
@@ -5536,6 +5536,15 @@ static int rt5677_init_irq(struct i2c_client *i2c)
 	return ret;
 }
 
+static const struct acpi_gpio_params rt5677_acpi_reset_gpios = {0, 0, true};
+static const struct acpi_gpio_params rt5677_acpi_ldo2_gpios = {1, 0, false};
+
+static const struct acpi_gpio_mapping rt5677_acpi_gpios[] = {
+	{ "realtek,reset-gpios", &rt5677_acpi_reset_gpios, 1 },
+	{ "realtek,pow-ldo2-gpios", &rt5677_acpi_ldo2_gpios, 1 },
+	{},
+};
+
 static int rt5677_i2c_probe(struct i2c_client *i2c)
 {
 	struct rt5677_priv *rt5677;
@@ -5556,6 +5565,9 @@ static int rt5677_i2c_probe(struct i2c_client *i2c)
 	if (rt5677->type == 0)
 		return -EINVAL;
 
+	if (devm_acpi_dev_add_driver_gpios(rt5677->dev, rt5677_acpi_gpios))
+		dev_warn(rt5677->dev, "Unable to add GPIO mapping table\n");
+
 	rt5677_read_device_properties(rt5677, &i2c->dev);
 
 	/* pow-ldo2 and reset are optional. The codec pins may be statically
-- 
2.51.0