intel/kunimitsu: Add support for MAX98357A audio amplifier

Adding support for Maxim 98357A audio amplifier.

BUG=chrome-os-partner:44481
BRANCH=None
TEST=Build & boot on Skylake kunimitsu Fab4 with MAXIM codec.
Verify audio playback works using MAXIM.

Change-Id: I4f020ccae540b02d5d533704a52cebb7805715fe
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: c0a81300e02e917500fa3c0241c95dd795abaf04
Original-Change-Id: I8875c9a55f09b1ec353203cfcb2186dc5fd66542
Original-Signed-off-by: Rohit Ainapure <rohit.m.ainapure@intel.com>
Original-Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/309894
Original-Tested-by: Rohit M Ainapure <rohit.m.ainapure@intel.com>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/12949
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/intel/kunimitsu/acpi/mainboard.asl

@@ -44,6 +44,45 @@ Scope (\_SB)
 	{
 		Name (_HID, EisaId ("PNP0C0C"))
 	}
+
+	Device (MAXM)
+	{
+		Name (_HID, "MX98357A")
+		Name (_DDN, "Maxim Integrated 98357A Amplifier")
+		Name (_UID, 1)
+		Name (_CRS, ResourceTemplate()
+		{
+			GpioIo (Exclusive, PullDefault, 0x0000, 0x0000,
+				IoRestrictionOutputOnly,
+				"\\_SB.PCI0.GPIO", 0x00, ResourceConsumer,,)
+			{
+				AUDIO_DB_ID
+			}
+		})
+		Name (_DSD, Package ()
+		{
+			ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+			Package () {
+				Package () {
+					/*
+					 * Create a named GPIO
+					 * "sdmode-gpio" for the
+					 * kernel codec driver
+					 * to use.
+					 */
+
+					"sdmode-gpio", Package () {
+								^MAXM, 0, 0, 0
+							}
+				},
+			}
+		})
+
+		Method (_STA)
+		{
+			Return (0xF)
+		}
+	}
 }
 
 /*

src/mainboard/intel/kunimitsu/gpio.h

@@ -50,6 +50,14 @@
 #define EC_SCI_GPI		GPE0_DW2_16
 #define EC_SMI_GPI		GPP_E15
 
+/*
+ * GPP_E3 is AUDIO_DB_ID.
+ * It is a dual purpose GPIO, used for Audio Daughter
+ * Board Identification & to control the shutdown mode pin
+ * of the Maxim amp.
+ */
+#define AUDIO_DB_ID		GPP_E3
+
 #ifndef __ACPI__
 /* Pad configuration in ramstage. */
 static const struct pad_config gpio_table[] = {