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The RPMI specification defines a clock service group which can be accessed via SBI MPXY extension or dedicated S-mode RPMI transport. Add mailbox client based clock driver for the RISC-V RPMI clock service group. Reviewed-by: Stephen Boyd <sboyd@kernel.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Co-developed-by: Anup Patel <apatel@ventanamicro.com> Signed-off-by: Anup Patel <apatel@ventanamicro.com> Signed-off-by: Rahul Pathak <rpathak@ventanamicro.com> Link: https://lore.kernel.org/r/20250818040920.272664-11-apatel@ventanamicro.com [pjw@kernel.org: converted rpmi_clkrate_u64 macro to a function; replaced bare constant with a macro] Signed-off-by: Paul Walmsley <pjw@kernel.org>