linux-kernel - [PATCH 4/4] clocksource/drivers/timer-rtl-otto: simplify documentation

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Message-ID: <20250804080328.2609287-5-markus.stockhausen@gmx.de>
Date: Mon,  4 Aug 2025 04:03:28 -0400
From: Markus Stockhausen <markus.stockhausen@....de>
To: markus.stockhausen@....de,
	daniel.lezcano@...aro.org,
	tglx@...utronix.de,
	linux-kernel@...r.kernel.org,
	howels@...thatwemight.be,
	bjorn@...k.no
Subject: [PATCH 4/4] 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@....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 42f702aca689..6113d2fdd4de 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
 
-- 
2.47.0