google/reef: ACPI: Move touchpad to SSDT and remove TPM

Instantiate the touchpad using the drivers/i2c/generic device driver
to generate the ACPI object in the SSDT.

There is not currently a separate wake pin for this device, this will
be added in EVT hardware.

This was tested on the reef board by ensuring that the touchpad device
continues to work in the OS.

Also remove the LPC TPM from the DSDT as it is not present.

Change-Id: I3151a28f628e66f63033398d6fab9fd8f5dfc37b
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/15481
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/google/reef/Kconfig

@@ -25,6 +25,9 @@ config CHROMEOS
 	select VBOOT_OPROM_MATTERS
 	select VIRTUAL_DEV_SWITCH
 
+config DRIVERS_I2C_GENERIC
+	default y
+
 config MAINBOARD_DIR
 	string
 	default google/reef

src/mainboard/google/reef/acpi/mainboard.asl

@@ -33,54 +33,8 @@ Scope (\_SB)
 	}
 }
 
-Scope (\_SB.PCI0.I2C4)
-{
-	/* Standard Mode: HCNT, LCNT, SDA Hold Register */
-	/* SDA Hold register value of 40 indicates
-	 * sda hold time of 0.3us for ic_clk of 133MHz
-	 */
-	Name (SSCN, Package () { 0, 0, 40 })
-
-	/* Fast Mode: HCNT, LCNT, SDA Hold Register */
-	/* SDA Hold register value of 40 indicates
-	 * sda hold time of 0.3us for ic_clk of 133MHz
-	 */
-	Name (FMCN, Package () { 0, 0, 40 })
-
-	Device (ETPA)
-	{
-		Name (_HID, "ELAN0000")
-		Name (_DDN, "Elan Touchpad")
-		Name (_UID, 1)
-		Name (ISTP, 1) /* Touchpad */
-
-		Name (_CRS, ResourceTemplate()
-		{
-			I2cSerialBus (
-				0x15,                     // SlaveAddress
-				ControllerInitiated,      // SlaveMode
-				400000,                   // ConnectionSpeed
-				AddressingMode7Bit,       // AddressingMode
-				"\\_SB.PCI0.I2C4",        // ResourceSource
-			)
-			Interrupt (ResourceConsumer, Edge, ActiveLow)
-			{
-				TOUCHPAD_INT
-			}
-		})
-
-		Method (_STA)
-		{
-			Return (0xF)
-		}
-	}
-}
-
-/*
- * LPC Trusted Platform Module
- */
 Scope (\_SB.PCI0.LPCB)
 {
-	#include <drivers/pc80/tpm/acpi/tpm.asl>
+	/* Chrome OS Embedded Controller */
 	#include "ec.asl"
 }

src/mainboard/google/reef/devicetree.cb

@@ -61,7 +61,14 @@ chip soc/intel/apollolake
 		device pci 16.1 on  end	# - I2C 1
 		device pci 16.2 on  end	# - I2C 2
 		device pci 16.3 on  end	# - I2C 3
-		device pci 17.0 on  end	# - I2C 4
+		device pci 17.0 on
+			chip drivers/i2c/generic
+				register "hid" = ""ELAN0000""
+				register "desc" = ""ELAN Touchpad""
+				register "irq" = "IRQ_EDGE_LOW(GPIO_18_IRQ)"
+				device i2c 15 on end
+			end
+		end # - I2C 4
 		device pci 17.1 on  end	# - I2C 5
 		device pci 17.2 on  end	# - I2C 6
 		device pci 17.3 on  end	# - I2C 7