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 48cbf6246052de10d35b616b5efb2f783904a49d
Changes since v2: - Added pending() callback implementation for tstc() console API to work correctly.
Changes since v1: - Fixed copyright header in SiFive UART driver - Imply SIFIVE_SERIAL for QEMU emulation instead of enabling it in defconfigs.
Anup Patel (2): drivers: serial: Add SiFive UART driver riscv: qemu: Imply SIFIVE_SERIAL for emulation
board/emulation/qemu-riscv/Kconfig | 1 + drivers/serial/Kconfig | 13 ++ drivers/serial/Makefile | 1 + drivers/serial/serial_sifive.c | 215 +++++++++++++++++++++++++++++ 4 files changed, 230 insertions(+) create mode 100644 drivers/serial/serial_sifive.c