riscv: Add Kendryte K210 SoC support

Add support for the Kendryte K210 RISC-V SoC. For now, this support
only provides a simple sysctl driver allowing to setup the CPU and
uart clock. This support is enabled through the new Kconfig option
SOC_KENDRYTE and defines the config option CONFIG_K210_SYSCTL
to enable the K210 SoC sysctl driver compilation.

The sysctl driver also registers an early SoC initialization function
allowing enabling the general purpose use of the 2MB of SRAM normally
reserved for the SoC AI engine. This initialization function is
automatically called before the dt early initialization using the flat
dt root node compatible property matching the value "kendryte,k210".

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
[Palmer: Add missing endmenu in Kconfig.socs]
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
index d325b67d00df..69071578e181 100644
--- a/arch/riscv/Kconfig.socs
+++ b/arch/riscv/Kconfig.socs
@@ -10,4 +10,34 @@ config SOC_SIFIVE
 	help
 	  This enables support for SiFive SoC platform hardware.
 
+config SOC_VIRT
+       bool "QEMU Virt Machine"
+       select VIRTIO_PCI
+       select VIRTIO_BALLOON
+       select VIRTIO_MMIO
+       select VIRTIO_CONSOLE
+       select VIRTIO_NET
+       select NET_9P_VIRTIO
+       select VIRTIO_BLK
+       select SCSI_VIRTIO
+       select DRM_VIRTIO_GPU
+       select HW_RANDOM_VIRTIO
+       select RPMSG_CHAR
+       select RPMSG_VIRTIO
+       select CRYPTO_DEV_VIRTIO
+       select VIRTIO_INPUT
+       select POWER_RESET_SYSCON
+       select POWER_RESET_SYSCON_POWEROFF
+       select GOLDFISH
+       select RTC_DRV_GOLDFISH
+       select SIFIVE_PLIC
+       help
+         This enables support for QEMU Virt Machine.
+
+config SOC_KENDRYTE
+	bool "Kendryte K210 SoC"
+	depends on !MMU
+	help
+	  This enables support for Kendryte K210 SoC platform hardware.
+
 endmenu