[PATCH v1 1/5] riscv: Kconfig.socs: Split ARCH_CANAAN and SOC_CANAAN_K210

[Yangyu Chen]

Since SOC_FOO should be deprecated from patch [1], and cleanup for other
SoCs is already in the mailing list [2,3,4], we remove the use of
SOC_CANAAN and use ARCH_CANAAN for SoCs vendored by Canaan instead from now
on. And allows ARCH_CANAAN to be selected for other Canaan SoCs. However,
we should keep the config SOC_CANAAN and use def_bool to redirect the
symbol temporarily to avoid potential conflict.

Since we now have Canaan Kendryte K230 with MMU, ARCH_CANAAN is no longer
referred to as K210. There are some special features for K210, like M-Mode
No MMU and loader.bin in arch/riscv/Makefile. If we keep ARCH_CANAAN for
other Canaan SoCs and remove the K210, the depends on !MMU in Kconfig may
confuse some users who try to boot Kernel with MMU on K210, as Damien
mentioned in the list [5]. Thus, we introduce a new symbol SOC_CANAAN_K210
for any conditional code or driver selection specific to the K210, so users
will not try to build some K210-specific things when MMU is enabled and see
it fails to boot on K210.

[1] https://lore.kernel.org/linux-riscv/20221121221414.109965-1-conor@kernel.org/
[2] https://lore.kernel.org/linux-riscv/20240305-praying-clad-c4fbcaa7ed0a@spud/
[3] https://lore.kernel.org/linux-riscv/20240305-fled-undrilled-41dc0c46bb29@spud/
[4] https://lore.kernel.org/linux-riscv/20240305-stress-earflap-d7ddb8655a4d@spud/
[5] https://lore.kernel.org/linux-riscv/2b0511af-1b5b-4c90-a673-c9113bb58142@kernel.org/

Signed-off-by: Yangyu Chen <cyy at cyyself.name>
---
 arch/riscv/Kconfig.socs                        | 10 ++++++++--
 arch/riscv/Makefile                            |  2 +-
 arch/riscv/configs/nommu_k210_defconfig        |  3 ++-
 arch/riscv/configs/nommu_k210_sdcard_defconfig |  3 ++-
 4 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
index 623de5f8a208..17340aa4dcfc 100644
--- a/arch/riscv/Kconfig.socs
+++ b/arch/riscv/Kconfig.socs
@@ -72,11 +72,17 @@ config SOC_VIRT
 	  This enables support for QEMU Virt Machine.
 
 config ARCH_CANAAN
-	def_bool SOC_CANAAN
+	bool "Canaan Kendryte SoC"
+	help
+	  This enables support for Canaan Kendryte series SoC platform hardware.
 
 config SOC_CANAAN
+	def_bool SOC_CANAAN_K210
+	depends on ARCH_CANAAN
+
+config SOC_CANAAN_K210
 	bool "Canaan Kendryte K210 SoC"
-	depends on !MMU
+	depends on !MMU && ARCH_CANAAN
 	select CLINT_TIMER if RISCV_M_MODE
 	select ARCH_HAS_RESET_CONTROLLER
 	select PINCTRL
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 252d63942f34..fa6c389c3986 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -154,7 +154,7 @@ vdso-install-y			+= arch/riscv/kernel/vdso/vdso.so.dbg
 vdso-install-$(CONFIG_COMPAT)	+= arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg:../compat_vdso/compat_vdso.so
 
 ifneq ($(CONFIG_XIP_KERNEL),y)
-ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy)
+ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN_K210),yy)
 KBUILD_IMAGE := $(boot)/loader.bin
 else
 ifeq ($(CONFIG_EFI_ZBOOT),)
diff --git a/arch/riscv/configs/nommu_k210_defconfig b/arch/riscv/configs/nommu_k210_defconfig
index 7e75200543f4..2552e78074a3 100644
--- a/arch/riscv/configs/nommu_k210_defconfig
+++ b/arch/riscv/configs/nommu_k210_defconfig
@@ -27,7 +27,8 @@ CONFIG_EXPERT=y
 CONFIG_SLUB=y
 CONFIG_SLUB_TINY=y
 # CONFIG_MMU is not set
-CONFIG_SOC_CANAAN=y
+CONFIG_ARCH_CANAAN=y
+CONFIG_SOC_CANAAN_K210=y
 CONFIG_NONPORTABLE=y
 CONFIG_SMP=y
 CONFIG_NR_CPUS=2
diff --git a/arch/riscv/configs/nommu_k210_sdcard_defconfig b/arch/riscv/configs/nommu_k210_sdcard_defconfig
index 0ba353e9ca71..8f67fb830585 100644
--- a/arch/riscv/configs/nommu_k210_sdcard_defconfig
+++ b/arch/riscv/configs/nommu_k210_sdcard_defconfig
@@ -19,7 +19,8 @@ CONFIG_EXPERT=y
 CONFIG_SLUB=y
 CONFIG_SLUB_TINY=y
 # CONFIG_MMU is not set
-CONFIG_SOC_CANAAN=y
+CONFIG_ARCH_CANAAN=y
+CONFIG_SOC_CANAAN_K210=y
 CONFIG_NONPORTABLE=y
 CONFIG_SMP=y
 CONFIG_NR_CPUS=2
-- 
2.43.0