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This is the initial commit of the SiFive PWM timer. This is used by guest software as a timer and is included in the SiFive FU540 SoC. Signed-off-by: Justin Restivo <jrestivo@draper.com> Signed-off-by: Alexandra Clifford <aclifford@draper.com> Signed-off-by: Amanda Strnad <astrnad@draper.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Message-id: 9f70a210acbfaf0e1ea6ad311ab892ac69134d8b.1631159656.git.alistair.francis@wdc.com