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Unverified Commit 2ac6795f authored by Anup Patel's avatar Anup Patel Committed by Palmer Dabbelt
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clocksource/drivers: Add CLINT timer driver



We add a separate CLINT timer driver for Linux RISC-V M-mode (i.e.
RISC-V NoMMU kernel).

The CLINT MMIO device provides three things:
1. 64bit free running counter register
2. 64bit per-CPU time compare registers
3. 32bit per-CPU inter-processor interrupt registers

Unlike other timer devices, CLINT provides IPI registers along with
timer registers. To use CLINT IPI registers, the CLINT timer driver
provides IPI related callbacks to arch/riscv.

Signed-off-by: default avatarAnup Patel <anup.patel@wdc.com>
Tested-by: default avatarEmil Renner Berhing <kernel@esmil.dk>
Acked-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: default avatarAtish Patra <atish.patra@wdc.com>
Reviewed-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent cc7f3f72
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