The following commit has been merged into the timers/clocksource branch of tip:

Commit-ID:     931bd9273848aca9dc40dd5cad3fcfe5d0818972
Gitweb:        https://git.kernel.org/tip/931bd9273848aca9dc40dd5cad3fcfe5d0818972
Author:        Markus Stockhausen <markus.stockhausen@gmx.de>
AuthorDate:    Mon, 04 Aug 2025 04:03:28 -04:00
Committer:     Daniel Lezcano <daniel.lezcano@linaro.org>
CommitterDate: Tue, 23 Sep 2025 12:41:26 +02:00

clocksource/drivers/timer-rtl-otto: Simplify documentation

While the main SoC PLL is responsible for the lexra bus frequency
it has no implications on the the timer divisior. Update the
comments accordingly.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20250804080328.2609287-5-markus.stockhausen@gmx.de
---
 drivers/clocksource/timer-rtl-otto.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/clocksource/timer-rtl-otto.c b/drivers/clocksource/timer-rtl-otto.c
index 42f702a..6113d2f 100644
--- a/drivers/clocksource/timer-rtl-otto.c
+++ b/drivers/clocksource/timer-rtl-otto.c
@@ -41,12 +41,10 @@
 #define RTTM_MAX_DIVISOR	GENMASK(15, 0)
 
 /*
- * Timers are derived from the LXB clock frequency. Usually this is a fixed
- * multiple of the 25 MHz oscillator. The 930X SOC is an exception from that.
- * Its LXB clock has only dividers and uses the switch PLL of 2.45 GHz as its
- * base. The only meaningful frequencies we can achieve from that are 175.000
- * MHz and 153.125 MHz. The greatest common divisor of all explained possible
- * speeds is 3125000. Pin the timers to this 3.125 MHz reference frequency.
+ * Timers are derived from the lexra bus (LXB) clock frequency. This is 175 MHz
+ * on RTL930x and 200 MHz on the other platforms. With 3.125 MHz choose a common
+ * divisor to have enough range and detail. This provides comparability between
+ * the different platforms.
  */
 #define RTTM_TICKS_PER_SEC	3125000