Messages in this thread | | | From | Mason <> | Subject | Trivial clocksource driver | Date | Tue, 29 Sep 2015 18:25:57 +0200 |
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Hello everyone,
I am trying to submit a new ARM port, and Arnd pointed out that the clocksource code could not live in arch/arm/$PLATFORM, but had to move to drivers/clocksource (and it had to support DT).
Did I understand correctly? Is this the right place to submit code as provided below?
Regards.
#include <linux/delay.h> /* register_current_timer_delay */ #include <linux/clocksource.h> /* clocksource_register_hz */ #include <linux/sched_clock.h> /* sched_clock_register */ #include <linux/of_address.h> /* of_iomap */ #include <linux/clk.h> /* of_clk_get, clk_get_rate */
static void __iomem *xtal_in_cnt; static struct delay_timer delay_timer;
static unsigned long read_xtal_counter(void) { return readl_relaxed(xtal_in_cnt); }
static u64 read_sched_clock(void) { return read_xtal_counter(); }
static cycle_t read_clocksource(struct clocksource *cs) { return read_xtal_counter(); }
static struct clocksource tango_xtal = { .name = "tango-xtal", .rating = 350, .read = read_clocksource, .mask = CLOCKSOURCE_MASK(32), .flags = CLOCK_SOURCE_IS_CONTINUOUS, };
static void __init tango_clksrc_init(struct device_node *np) { struct clk *clk = of_clk_get(np, 0); unsigned int xtal_freq = clk_get_rate(clk); xtal_in_cnt = of_iomap(np, 0);
delay_timer.freq = xtal_freq; delay_timer.read_current_timer = read_xtal_counter; register_current_timer_delay(&delay_timer); sched_clock_register(read_sched_clock, 32, xtal_freq); clocksource_register_hz(&tango_xtal, xtal_freq); }
CLOCKSOURCE_OF_DECLARE(tango, "sigma,xtal_in_cnt", tango_clksrc_init);
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