This patchset adds SiFive UART driver for SiFive UART found on SiFive boards.
The driver is tested on QEMU sifive_u machine. In fact, with this patchset same U-Boot binary boots on QEMU virt machine and QEMU sifive_u machine in both M-mode and S-mode.
The patches are based upon latest RISC-V UBoot tree (git://git.denx.de/u-boot-riscv.git) at commit id ce41c65382300b4be2b84df3c06c2aa6c591741d
Anup Patel (2): drivers: serial: Add SiFive UART driver riscv: qemu: Enable SiFive UART driver in defconfigs
configs/qemu-riscv32_defconfig | 1 + configs/qemu-riscv32_smode_defconfig | 1 + configs/qemu-riscv64_defconfig | 1 + configs/qemu-riscv64_smode_defconfig | 1 + drivers/serial/Kconfig | 13 ++ drivers/serial/Makefile | 1 + drivers/serial/serial_sifive.c | 193 +++++++++++++++++++++++++++ 7 files changed, 211 insertions(+) create mode 100644 drivers/serial/serial_sifive.c