rtc: nct3018y: fix incorrect maximum clock rate handling

When nct3018y_clkout_round_rate() is called with a requested rate higher
than the highest supported rate, it currently returns 0, which disables
the clock. According to the clk API, round_rate() should instead return
the highest supported rate. Update the function to return the maximum
supported rate in this case.

Fixes: 5adbaed16cc63 ("rtc: Add NCT3018Y real time clock driver")
Signed-off-by: Brian Masney <bmasney@redhat.com>
Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-3-33140bb2278e@redhat.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/rtc-nct3018y.c b/drivers/rtc/rtc-nct3018y.c
index 76c5f464b2daeb59fa8367bff3ad261ed75dd937..cea05fca0bccddc6384c462cf1ebdc59b377a24d 100644 (file)
--- a/drivers/rtc/rtc-nct3018y.c
+++ b/drivers/rtc/rtc-nct3018y.c
@@ -376,7 +376,7 @@ static long nct3018y_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
                if (clkout_rates[i] <= rate)
                        return clkout_rates[i];
 
-       return 0;
+       return clkout_rates[0];
 }
 
 static int nct3018y_clkout_set_rate(struct clk_hw *hw, unsigned long rate,