ar71xx: disable devicetree support

While we'd like to convert ar71xx to DT-based configuration
eventually, we aren't quite there yet, and shipping half-baked DT support
that is not used at all wastes precious space.

Saves ~120KB before LZMA, ~33KB after LZMA.

Run-tested on TP-Link CPE510 and TL-WR841 v7.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

target/linux/ar71xx/config-4.9

@@ -284,7 +284,6 @@ CONFIG_CRYPTO_RNG2=y
 CONFIG_CRYPTO_WORKQUEUE=y
 CONFIG_CSRC_R4K=y
 CONFIG_DMA_NONCOHERENT=y
-CONFIG_DTC=y
 CONFIG_EARLY_PRINTK=y
 CONFIG_ETHERNET_PACKET_MANGLE=y
 CONFIG_FIXED_PHY=y
@@ -360,14 +359,12 @@ CONFIG_INITRAMFS_ROOT_UID=0
 CONFIG_INITRAMFS_SOURCE="../../root"
 CONFIG_INTEL_XWAY_PHY=y
 CONFIG_IP17XX_PHY=y
-CONFIG_IRQCHIP=y
 CONFIG_IRQ_DOMAIN=y
 CONFIG_IRQ_FORCED_THREADING=y
 CONFIG_IRQ_MIPS_CPU=y
 CONFIG_IRQ_WORK=y
 CONFIG_LEDS_GPIO=y
 # CONFIG_LEDS_WNDR3700_USB is not set
-CONFIG_LIBFDT=y
 CONFIG_MARVELL_PHY=y
 CONFIG_MDIO_BITBANG=y
 CONFIG_MDIO_BOARDINFO=y
@@ -378,15 +375,10 @@ CONFIG_MIPS_ASID_BITS=8
 CONFIG_MIPS_ASID_SHIFT=0
 CONFIG_MIPS_CLOCK_VSYSCALL=y
 # CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND is not set
-# CONFIG_MIPS_CMDLINE_DTB_EXTEND is not set
 CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER=y
-# CONFIG_MIPS_CMDLINE_FROM_DTB is not set
-# CONFIG_MIPS_ELF_APPENDED_DTB is not set
 # CONFIG_MIPS_HUGE_TLB_SUPPORT is not set
 CONFIG_MIPS_L1_CACHE_SHIFT=5
 CONFIG_MIPS_MACHINE=y
-CONFIG_MIPS_NO_APPENDED_DTB=y
-# CONFIG_MIPS_RAW_APPENDED_DTB is not set
 CONFIG_MIPS_SPRAM=y
 CONFIG_MODULES_USE_ELF_REL=y
 CONFIG_MTD_CFI_ADV_OPTIONS=y
@@ -422,17 +414,7 @@ CONFIG_NET_DSA_TAG_TRAILER=y
 CONFIG_NET_SWITCHDEV=y
 CONFIG_NO_GENERIC_PCI_IOPORT_MAP=y
 # CONFIG_NO_IOPORT_MAP is not set
-CONFIG_OF=y
+# CONFIG_OF is not set
-CONFIG_OF_ADDRESS=y
-CONFIG_OF_ADDRESS_PCI=y
-CONFIG_OF_EARLY_FLATTREE=y
-CONFIG_OF_FLATTREE=y
-CONFIG_OF_GPIO=y
-CONFIG_OF_IRQ=y
-CONFIG_OF_MDIO=y
-CONFIG_OF_NET=y
-CONFIG_OF_PCI=y
-CONFIG_OF_PCI_IRQ=y
 CONFIG_PCI=y
 CONFIG_PCI_AR724X=y
 CONFIG_PCI_DISABLE_COMMON_QUIRKS=y
@@ -486,4 +468,3 @@ CONFIG_SYS_SUPPORTS_ZBOOT=y
 CONFIG_SYS_SUPPORTS_ZBOOT_UART_PROM=y
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_USB_SUPPORT=y
-CONFIG_USE_OF=y

target/linux/ar71xx/mikrotik/config-default

@@ -235,7 +235,6 @@ CONFIG_MTD_NAND_ECC=y
 CONFIG_MTD_NAND_RB4XX=y
 CONFIG_MTD_NAND_RB750=y
 CONFIG_MTD_NAND_RB91X=y
-# CONFIG_MTD_OF_PARTS is not set
 # CONFIG_MTD_REDBOOT_PARTS is not set
 CONFIG_MTD_SPI_NOR_USE_4K_SECTORS=y
 # CONFIG_MTD_SPLIT_EVA_FW is not set

target/linux/ar71xx/patches-4.9/604-MIPS-ath79-no-of.patch

@@ -0,0 +1,70 @@
+--- a/arch/mips/Kconfig
++++ b/arch/mips/Kconfig
+@@ -195,7 +195,6 @@ config ATH79
+ 	select SYS_SUPPORTS_BIG_ENDIAN
+ 	select SYS_SUPPORTS_MIPS16
+ 	select SYS_SUPPORTS_ZBOOT_UART_PROM
+-	select USE_OF
+ 	help
+ 	  Support for the Atheros AR71XX/AR724X/AR913X SoCs.
+ 
+--- a/arch/mips/ath79/setup.c
++++ b/arch/mips/ath79/setup.c
+@@ -196,16 +196,20 @@ unsigned int get_c0_compare_int(void)
+ 
+ void __init plat_mem_setup(void)
+ {
++#ifdef CONFIG_OF
+ 	unsigned long fdt_start;
++#endif
+ 
+ 	set_io_port_base(KSEG1);
+ 
++#ifdef CONFIG_OF
+ 	/* Get the position of the FDT passed by the bootloader */
+ 	fdt_start = fw_getenvl("fdt_start");
+ 	if (fdt_start)
+ 		__dt_setup_arch((void *)KSEG0ADDR(fdt_start));
+ 	else if (fw_passed_dtb)
+ 		__dt_setup_arch((void *)KSEG0ADDR(fw_passed_dtb));
++#endif
+ 
+ 	if (mips_machtype != ATH79_MACH_GENERIC_OF) {
+ 		ath79_reset_base = ioremap_nocache(AR71XX_RESET_BASE,
+@@ -301,17 +305,21 @@ static int __init ath79_setup(void)
+ 
+ arch_initcall(ath79_setup);
+ 
++#ifdef CONFIG_OF
+ void __init device_tree_init(void)
+ {
+ 	unflatten_and_copy_device_tree();
+ }
++#endif
+ 
+ MIPS_MACHINE(ATH79_MACH_GENERIC,
+ 	     "Generic",
+ 	     "Generic AR71XX/AR724X/AR913X based board",
+ 	     NULL);
+ 
++#ifdef CONFIG_OF
+ MIPS_MACHINE(ATH79_MACH_GENERIC_OF,
+ 	     "DTB",
+ 	     "Generic AR71XX/AR724X/AR913X based board (DT)",
+ 	     NULL);
++#endif
+--- a/arch/mips/ath79/clock.c
++++ b/arch/mips/ath79/clock.c
+@@ -33,10 +33,12 @@
+ #define AR724X_BASE_FREQ	40000000
+ 
+ static struct clk *clks[ATH79_CLK_END];
++#ifdef CONFIG_OF
+ static struct clk_onecell_data clk_data = {
+ 	.clks = clks,
+ 	.clk_num = ARRAY_SIZE(clks),
+ };
++#endif
+ 
+ static struct clk *__init ath79_add_sys_clkdev(
+ 	const char *id, unsigned long rate)

target/linux/ar71xx/patches-4.9/620-MIPS-ath79-add-support-for-QCA953x-SoC.patch

@@ -44,7 +44,7 @@ meaning of the bits CPUCLK_FROM_CPUPLL and DDRCLK_FROM_DDRPLL is reversed.
  config ATH79_NVRAM
 --- a/arch/mips/ath79/clock.c
 +++ b/arch/mips/ath79/clock.c
-@@ -356,6 +356,91 @@ static void __init ar934x_clocks_init(vo
+@@ -358,6 +358,91 @@ static void __init ar934x_clocks_init(vo
  	iounmap(dpll_base);
  }
  
@@ -136,7 +136,7 @@ meaning of the bits CPUCLK_FROM_CPUPLL and DDRCLK_FROM_DDRPLL is reversed.
  static void __init qca955x_clocks_init(void)
  {
  	unsigned long ref_rate;
-@@ -451,6 +536,8 @@ void __init ath79_clocks_init(void)
+@@ -453,6 +538,8 @@ void __init ath79_clocks_init(void)
  		ar933x_clocks_init();
  	else if (soc_is_ar934x())
  		ar934x_clocks_init();

target/linux/ar71xx/patches-4.9/621-MIPS-ath79-add-support-for-QCA956x-SoC.patch

@@ -24,7 +24,7 @@
  config ATH79_NVRAM
 --- a/arch/mips/ath79/clock.c
 +++ b/arch/mips/ath79/clock.c
-@@ -526,6 +526,100 @@ static void __init qca955x_clocks_init(v
+@@ -528,6 +528,100 @@ static void __init qca955x_clocks_init(v
  	clk_add_alias("uart", NULL, "ref", NULL);
  }
  
@@ -125,7 +125,7 @@
  void __init ath79_clocks_init(void)
  {
  	if (soc_is_ar71xx())
-@@ -540,6 +634,8 @@ void __init ath79_clocks_init(void)
+@@ -542,6 +636,8 @@ void __init ath79_clocks_init(void)
  		qca953x_clocks_init();
  	else if (soc_is_qca955x())
  		qca955x_clocks_init();