kconfig: express dependency of individual boards on libfdt

Now that boards are enabled by default and the "CONFIG_FOO=y"
entries are gone from configs/devices/, there cannot be any more
a conflicts between the default contents of configs/devices/
and a failed "depends on" clause.

With this change, each individual board or target can express
whether it needs FDT.  It can then include the common code in the
build via "select DEVICE_TREE", which will also as tell meson to link
with libfdt.

This allows building non-microvm x86 emulators without having
libfdt available.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Kconfig.host

@@ -25,7 +25,6 @@ config TPM
 
 config FDT
     bool
-    select DEVICE_TREE
 
 config VHOST_USER
     bool

hw/arm/Kconfig

@@ -15,6 +15,7 @@ config ARM_VIRT
     select ACPI
     select ARM_SMMUV3
     select GPIO_KEY
+    select DEVICE_TREE
     select FW_CFG_DMA
     select PCI_EXPRESS
     select PCI_EXPRESS_GENERIC_BRIDGE
@@ -265,6 +266,7 @@ config SBSA_REF
     default y
     depends on TCG && AARCH64
     imply PCI_DEVICES
+    select DEVICE_TREE
     select AHCI
     select ARM_SMMUV3
     select GPIO_KEY
@@ -347,6 +349,7 @@ config VEXPRESS
     bool
     default y
     depends on TCG && ARM
+    select DEVICE_TREE
     select A9MPCORE
     select A15MPCORE
     select ARM_MPTIMER
@@ -492,6 +495,7 @@ config XLNX_ZYNQMP_ARM
     select CPU_CLUSTER
     select DDC
     select DPCD
+    select DEVICE_TREE
     select SDHCI
     select SSI
     select SSI_M25P80
@@ -509,6 +513,7 @@ config XLNX_VERSAL
     depends on TCG && AARCH64
     select ARM_GIC
     select CPU_CLUSTER
+    select DEVICE_TREE
     select PL011
     select CADENCE
     select VIRTIO_MMIO

hw/i386/Kconfig

@@ -115,7 +115,8 @@ config Q35
 config MICROVM
     bool
     default y
-    depends on I386
+    depends on I386 && FDT
+    select DEVICE_TREE
     select SERIAL_ISA # for serial_hds_isa_init()
     select ISA_BUS
     select APIC

hw/loongarch/Kconfig

@@ -1,7 +1,8 @@
 config LOONGARCH_VIRT
     bool
     default y
-    depends on LOONGARCH64
+    depends on LOONGARCH64 && FDT
+    select DEVICE_TREE
     select PCI
     select PCI_EXPRESS_GENERIC_BRIDGE
     imply VIRTIO_VGA

hw/mips/Kconfig

@@ -80,9 +80,10 @@ config MIPS_CPS
 config MIPS_BOSTON
     bool
     default y
-    depends on MIPS64 && !TARGET_BIG_ENDIAN
+    depends on MIPS64 && !TARGET_BIG_ENDIAN && FDT
     imply PCI_DEVICES
     imply TEST_DEVICES
+    select DEVICE_TREE
     select FITLOADER
     select MIPS_CPS
     select PCI_EXPRESS_XILINX

hw/openrisc/Kconfig

@@ -2,6 +2,7 @@ config OR1K_SIM
     bool
     default y
     depends on OPENRISC
+    select DEVICE_TREE
     select SERIAL
     select OPENCORES_ETH
     select OMPIC
@@ -14,6 +15,7 @@ config OR1K_VIRT
     imply PCI_DEVICES
     imply VIRTIO_VGA
     imply TEST_DEVICES
+    select DEVICE_TREE
     select PCI
     select PCI_EXPRESS_GENERIC_BRIDGE
     select GOLDFISH_RTC

hw/ppc/Kconfig

@@ -1,7 +1,7 @@
 config PSERIES
     bool
     default y
-    depends on PPC64
+    depends on PPC64 && FDT
     imply USB_OHCI_PCI
     imply PCI_DEVICES
     imply TEST_DEVICES
@@ -26,7 +26,7 @@ config SPAPR_RNG
 config POWERNV
     bool
     default y
-    depends on PPC64
+    depends on PPC64 && FDT
     imply PCI_DEVICES
     imply TEST_DEVICES
     select ISA_IPMI_BT
@@ -52,7 +52,7 @@ config PPC405
 config PPC440
     bool
     default y
-    depends on PPC
+    depends on PPC && FDT
     imply PCI_DEVICES
     imply TEST_DEVICES
     imply E1000_PCI
@@ -71,7 +71,7 @@ config PPC4XX
 config SAM460EX
     bool
     default y
-    depends on PPC
+    depends on PPC && FDT
     select PFLASH_CFI01
     select IDE_SII3112
     select M41T80
@@ -168,19 +168,19 @@ config E500
 config E500PLAT
     bool
     default y
-    depends on PPC
+    depends on PPC && FDT
     select E500
 
 config MPC8544DS
     bool
     default y
-    depends on PPC
+    depends on PPC && FDT
     select E500
 
 config VIRTEX
     bool
     default y
-    depends on PPC
+    depends on PPC && FDT
     select PPC4XX
     select PFLASH_CFI01
     select SERIAL
@@ -193,6 +193,7 @@ config FW_CFG_PPC
     bool
 
 config FDT_PPC
+    select DEVICE_TREE
     bool
 
 config VOF

hw/riscv/Kconfig

@@ -12,6 +12,7 @@ config MICROCHIP_PFSOC
     depends on RISCV64
     select CADENCE_SDHCI
     select CPU_CLUSTER
+    select DEVICE_TREE
     select MCHP_PFSOC_DMC
     select MCHP_PFSOC_IOSCB
     select MCHP_PFSOC_MMUART
@@ -37,6 +38,7 @@ config RISCV_VIRT
     imply VIRTIO_VGA
     imply TEST_DEVICES
     imply TPM_TIS_SYSBUS
+    select DEVICE_TREE
     select RISCV_NUMA
     select GOLDFISH_RTC
     select PCI
@@ -82,6 +84,7 @@ config SIFIVE_U
     depends on RISCV32 || RISCV64
     select CADENCE
     select CPU_CLUSTER
+    select DEVICE_TREE
     select RISCV_ACLINT
     select SIFIVE_GPIO
     select SIFIVE_PDMA
@@ -99,6 +102,7 @@ config SPIKE
     bool
     default y
     depends on RISCV32 || RISCV64
+    select DEVICE_TREE
     select RISCV_NUMA
     select HTIF
     select RISCV_ACLINT

hw/rx/Kconfig

@@ -8,5 +8,6 @@ config RX62N_MCU
 config RX_GDBSIM
     bool
     default y
-    depends on RX
+    depends on RX && FDT
+    select DEVICE_TREE
     select RX62N_MCU

hw/xtensa/Kconfig

@@ -15,6 +15,7 @@ config XTENSA_XTFPGA
     bool
     default y
     depends on XTENSA
+    imply DEVICE_TREE
     select OPENCORES_ETH
     select PFLASH_CFI01
     select SERIAL

target/arm/Kconfig

@@ -6,6 +6,8 @@ config ARM
     # translate.c v7m helpers under ARM_V7M.
     select ARM_V7M if TCG
 
+    select DEVICE_TREE # needed by boot.c
+
 config AARCH64
     bool
     select ARM

target/microblaze/Kconfig

@@ -1,2 +1,3 @@
 config MICROBLAZE
     bool
+    select DEVICE_TREE # needed by boot.c

target/openrisc/Kconfig

@@ -1,2 +1,3 @@
 config OPENRISC
     bool
+    select DEVICE_TREE # needed by boot.c

target/riscv/Kconfig

@@ -1,7 +1,9 @@
 config RISCV32
     bool
     select ARM_COMPATIBLE_SEMIHOSTING # for do_common_semihosting()
+    select DEVICE_TREE # needed by boot.c
 
 config RISCV64
     bool
     select ARM_COMPATIBLE_SEMIHOSTING # for do_common_semihosting()
+    select DEVICE_TREE # needed by boot.c