riscv: Add a SYSCON driver for Andestech's PLMT
The platform-Level Machine Timer (PLMT) block holds memory-mapped mtime register associated with timer tick. This driver implements the riscv_get_time() which is required by the generic RISC-V timer driver. Signed-off-by: NRick Chen <rick@andestech.com> Cc: Greentime Hu <greentime@andestech.com> Reviewed-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NLukas Auer <lukas.auer@aisec.fraunhofer.de>
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arch/riscv/lib/andes_plmt.c
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