google/reks: add new board as variant of cyan baseboard

Add support for google/reks (Lenovo Chromebook N22/N42) as
a variant of the cyan Braswell basebaseboard.

- Add board-specific code as the new reks variant
- Add new I2C touchscreen device and SPD files to the baseboard
for potential reuse by other variants

Sourced from Chromium branch firmware-reks-7287.133.B,
commit 7d812d4: Revert "Revert "soc/intel/braswell: Populate NVS SCC BAR1""

Change-Id: Iac9e2b5661aa33e12927f4cb84ebaee36522a385
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/21128
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/src/mainboard/google/cyan/acpi/touchscreen_melfas.asl b/src/mainboard/google/cyan/acpi/touchscreen_melfas.asl
new file mode 100644
index 0000000000..8d36649f51
--- /dev/null
+++ b/src/mainboard/google/cyan/acpi/touchscreen_melfas.asl
@@ -0,0 +1,60 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 Google Inc.
+ * Copyright (C) 2015 Intel Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+Scope (\_SB.PCI0.I2C1)
+{
+	Device (MTSA)
+	{
+		Name (_HID, "MLFS0000")
+		Name (_DDN, "Melfas Touchscreen ")
+		Name (_UID, 5)
+		Name (ISTP, 0) /* TouchScreen */
+
+		Method(_CRS, 0x0, NotSerialized)
+		{
+			Name (BUF0, ResourceTemplate ()
+			{
+				I2cSerialBus(
+					0x34,                     /* SlaveAddress */
+					ControllerInitiated,      /* SlaveMode */
+					400000,                   /* ConnectionSpeed */
+					AddressingMode7Bit,       /* AddressingMode */
+					"\\_SB.I2C1",             /* ResourceSource */
+				)
+				Interrupt (ResourceConsumer, Level, ActiveLow)
+				{
+					BOARD_TOUCH_IRQ
+				}
+			})
+			Return (BUF0)
+		}
+
+		Method (_STA)
+		{
+			If (LEqual (\S1EN, 1)) {
+				Return (0xF)
+			} Else {
+				Return (0x0)
+			}
+		}
+
+		Name (_PRW, Package() { BOARD_TOUCHSCREEN_WAKE_GPIO, 0x3 })
+
+		/* Allow device to power off in S0 */
+		Name (_S0W, 4)
+	}
+}