Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
authored by
Markus Stockhausen
and committed by
Daniel Lezcano
931bd927
c445bffb
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drivers/clocksource/timer-rtl-otto.c
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drivers/clocksource/timer-rtl-otto.c
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#define RTTM_MAX_DIVISOR GENMASK(15, 0)
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/*
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* Timers are derived from the LXB clock frequency. Usually this is a fixed
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* multiple of the 25 MHz oscillator. The 930X SOC is an exception from that.
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* Its LXB clock has only dividers and uses the switch PLL of 2.45 GHz as its
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* base. The only meaningful frequencies we can achieve from that are 175.000
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* MHz and 153.125 MHz. The greatest common divisor of all explained possible
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* speeds is 3125000. Pin the timers to this 3.125 MHz reference frequency.
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* Timers are derived from the lexra bus (LXB) clock frequency. This is 175 MHz
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* on RTL930x and 200 MHz on the other platforms. With 3.125 MHz choose a common
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* divisor to have enough range and detail. This provides comparability between
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* the different platforms.
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*/
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#define RTTM_TICKS_PER_SEC 3125000
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