[PATCH 02/11] clk: scmi: Use new determine_rate clock operation
From: Cristian Marussi <cristian.marussi@arm.com>
Date: 2026-02-27 15:33:13
Also in:
arm-scmi, linux-clk, linux-renesas-soc, lkml
Subsystem:
common clk framework, system control & power/management interface (scpi/scmi) message protocol drivers, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Sudeep Holla, Linus Torvalds
Use the Clock protocol layer determine_rate logic to calculate the closest rate that can be supported by a specific clock. No functional change. Cc: Brian Masney <bmasney@redhat.com> Cc: Michael Turquette <mturquette@baylibre.com> Cc: Stephen Boyd <sboyd@kernel.org> Cc: linux-clk@vger.kernel.org Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> --- Note that the calculation logic in the protocol layer is exactly the same as it wes here. @Brian I suppose once your CLK_ROUNDING_FW_MANAGED sereis is merged I can flag such SCMI clocks. --- drivers/clk/clk-scmi.c | 31 ++++++------------------------- 1 file changed, 6 insertions(+), 25 deletions(-)
diff --git a/drivers/clk/clk-scmi.c b/drivers/clk/clk-scmi.c
index 6b286ea6f121..c223e4ef1dd1 100644
--- a/drivers/clk/clk-scmi.c
+++ b/drivers/clk/clk-scmi.c@@ -12,7 +12,6 @@ #include <linux/of.h> #include <linux/module.h> #include <linux/scmi_protocol.h> -#include <asm/div64.h> #define NOT_ATOMIC false #define ATOMIC true
@@ -57,35 +56,17 @@ static unsigned long scmi_clk_recalc_rate(struct clk_hw *hw, static int scmi_clk_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) { - u64 fmin, fmax, ftmp; + int ret; struct scmi_clk *clk = to_scmi_clk(hw); /* - * We can't figure out what rate it will be, so just return the - * rate back to the caller. scmi_clk_recalc_rate() will be called - * after the rate is set and we'll know what rate the clock is + * If we could not get a better rate scmi_clk_recalc_rate() will be + * called after the rate is set and we'll know what rate the clock is * running at then. */ - if (clk->info->rate_discrete) - return 0; - - fmin = clk->info->range.min_rate; - fmax = clk->info->range.max_rate; - if (req->rate <= fmin) { - req->rate = fmin; - - return 0; - } else if (req->rate >= fmax) { - req->rate = fmax; - - return 0; - } - - ftmp = req->rate - fmin; - ftmp += clk->info->range.step_size - 1; /* to round up */ - do_div(ftmp, clk->info->range.step_size); - - req->rate = ftmp * clk->info->range.step_size + fmin; + ret = scmi_proto_clk_ops->determine_rate(clk->ph, clk->id, &req->rate); + if (ret) + return ret; return 0; }
--
2.53.0