mb/asus/p8h61-m_lx3_r2_0: Transform into variant setup

Get ready to squash all Asus H61 boards together, so as to factor out
lots of redundant code.

Tested with BUILD_TIMELESS=1, coreboot.rom for the Asus P8H61-M LX3 R2.0
remains identical when not adding the .config file in it.

Change-Id: I738197bf4d5ea8b879ae26ecbcb0cf3714316662
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54372
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

MAINTAINERS

@@ -174,6 +174,11 @@ M:	Mike Banon <mikebdp2@gmail.com>
 S:	Maintained
 F:	src/mainboard/asus/am1i-a/
 
+ASUS H61 SERIES MAINBOARDS
+M:	Angel Pons <th3fanbus@gmail.com>
+S:	Maintained
+F:	src/mainboard/asus/h61-series/
+
 ASUS MAXIMUS IV GENE-Z MAINBOARD
 M:	Tristan Corrick <tristan@corrick.kiwi>
 S:	Maintained
@@ -195,11 +200,6 @@ M:	Tristan Corrick <tristan@corrick.kiwi>
 S:	Maintained
 F:	src/mainboard/asus/p8h61-m_lx/
 
-ASUS P8H61-M LX3 R2.0 MAINBOARD
-M:	Angel Pons <th3fanbus@gmail.com>
-S:	Maintained
-F:	src/mainboard/asus/p8h61-m_lx3_r2_0/
-
 ASUS P8H61-M PRO MAINBOARD
 M:	Angel Pons <th3fanbus@gmail.com>
 S:	Maintained

src/mainboard/asus/h61-series/Kconfig

@@ -1,29 +1,32 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 
-if BOARD_ASUS_P8H61_M_LX3_R2_0
-
-config BOARD_SPECIFIC_OPTIONS
-	def_bool y
-	select BOARD_ROMSIZE_KB_8192
+config BOARD_ASUS_H61_SERIES
+	bool
 	select HAVE_ACPI_RESUME
 	select HAVE_ACPI_TABLES
 	select INTEL_GMA_HAVE_VBT
 	select MAINBOARD_HAS_LIBGFXINIT
-	select NO_UART_ON_SUPERIO
 	select NORTHBRIDGE_INTEL_SANDYBRIDGE
-	select REALTEK_8168_RESET
-	select RT8168_SET_LED_MODE
 	select SERIRQ_CONTINUOUS_MODE
 	select SOUTHBRIDGE_INTEL_BD82X6X
-	select SUPERIO_NUVOTON_NCT6779D
 	select USE_NATIVE_RAMINIT
 
+if BOARD_ASUS_H61_SERIES
+
 config MAINBOARD_DIR
 	string
-	default "asus/p8h61-m_lx3_r2_0"
+	default "asus/h61-series"
+
+config VARIANT_DIR
+	string
+	default "p8h61-m_lx3_r2_0" if BOARD_ASUS_P8H61_M_LX3_R2_0
 
 config MAINBOARD_PART_NUMBER
 	string
-	default "P8H61-M LX3 R2.0"
+	default "P8H61-M LX3 R2.0" if BOARD_ASUS_P8H61_M_LX3_R2_0
+
+config DEVICETREE
+	string
+	default "variants/\$(CONFIG_VARIANT_DIR)/devicetree.cb"
 
 endif

src/mainboard/asus/h61-series/Kconfig.name

@@ -0,0 +1,8 @@
+config BOARD_ASUS_P8H61_M_LX3_R2_0
+	bool "P8H61-M LX3 R2.0"
+	select BOARD_ASUS_H61_SERIES
+	select BOARD_ROMSIZE_KB_8192
+	select NO_UART_ON_SUPERIO
+	select REALTEK_8168_RESET
+	select RT8168_SET_LED_MODE
+	select SUPERIO_NUVOTON_NCT6779D

src/mainboard/asus/h61-series/Makefile.inc

@@ -0,0 +1,8 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+bootblock-y += variants/$(VARIANT_DIR)/early_init.c
+romstage-y  += variants/$(VARIANT_DIR)/early_init.c
+bootblock-y += variants/$(VARIANT_DIR)/gpio.c
+romstage-y  += variants/$(VARIANT_DIR)/gpio.c
+ramstage-y  += variants/$(VARIANT_DIR)/hda_verb.c
+ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += variants/$(VARIANT_DIR)/gma-mainboard.ads

src/mainboard/asus/h61-series/board_info.txt

@@ -0,0 +1,5 @@
+Category: desktop
+ROM package: DIP-8
+ROM protocol: SPI
+ROM socketed: y
+Flashrom support: y

src/mainboard/asus/p8h61-m_lx3_r2_0/Kconfig.name

@@ -1,2 +0,0 @@
-config BOARD_ASUS_P8H61_M_LX3_R2_0
-	bool "P8H61-M LX3 R2.0"

src/mainboard/asus/p8h61-m_lx3_r2_0/Makefile.inc

@@ -1,7 +0,0 @@
-bootblock-y += early_init.c
-bootblock-y += gpio.c
-
-romstage-y += early_init.c
-romstage-y += gpio.c
-
-ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads