diff options
author | Lubomir Rintel <lkundrak@v3.sk> | 2018-11-28 20:53:20 +0300 |
---|---|---|
committer | Olof Johansson <olof@lixom.net> | 2018-12-01 02:40:16 +0300 |
commit | f36797ee43802b367e59f0f9a9805304a4ff0c98 (patch) | |
tree | f64265056b3cb1fc10382a991687efd6f5e07e4c /arch/arm/mach-mmp/time.c | |
parent | e78ebdcb6ea83a891e6940381190040ae299e82d (diff) | |
download | linux-f36797ee43802b367e59f0f9a9805304a4ff0c98.tar.xz |
ARM: mmp/mmp2: dt: enable the clock
The device-tree booted MMP2 needs to enable the timer clock, otherwise
it would stop ticking when the boot finishes.
It can also use the clock rate from the clk, the non-DT boards need to
keep using the hardcoded rates.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-mmp/time.c')
-rw-r--r-- | arch/arm/mach-mmp/time.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/arch/arm/mach-mmp/time.c b/arch/arm/mach-mmp/time.c index 96ad1db0b04b..eab0fd8a7343 100644 --- a/arch/arm/mach-mmp/time.c +++ b/arch/arm/mach-mmp/time.c @@ -22,6 +22,7 @@ #include <linux/kernel.h> #include <linux/interrupt.h> #include <linux/clockchips.h> +#include <linux/clk.h> #include <linux/io.h> #include <linux/irq.h> @@ -38,12 +39,6 @@ #include "cputype.h" #include "clock.h" -#ifdef CONFIG_CPU_MMP2 -#define MMP_CLOCK_FREQ 6500000 -#else -#define MMP_CLOCK_FREQ 3250000 -#endif - #define TIMERS_VIRT_BASE TIMERS1_VIRT_BASE #define MAX_DELTA (0xfffffffe) @@ -189,19 +184,18 @@ static struct irqaction timer_irq = { .dev_id = &ckevt, }; -void __init timer_init(int irq) +void __init timer_init(int irq, unsigned long rate) { timer_config(); - sched_clock_register(mmp_read_sched_clock, 32, MMP_CLOCK_FREQ); + sched_clock_register(mmp_read_sched_clock, 32, rate); ckevt.cpumask = cpumask_of(0); setup_irq(irq, &timer_irq); - clocksource_register_hz(&cksrc, MMP_CLOCK_FREQ); - clockevents_config_and_register(&ckevt, MMP_CLOCK_FREQ, - MIN_DELTA, MAX_DELTA); + clocksource_register_hz(&cksrc, rate); + clockevents_config_and_register(&ckevt, rate, MIN_DELTA, MAX_DELTA); } #ifdef CONFIG_OF @@ -213,7 +207,9 @@ static const struct of_device_id mmp_timer_dt_ids[] = { void __init mmp_dt_init_timer(void) { struct device_node *np; + struct clk *clk; int irq, ret; + unsigned long rate; np = of_find_matching_node(NULL, mmp_timer_dt_ids); if (!np) { @@ -221,6 +217,18 @@ void __init mmp_dt_init_timer(void) goto out; } + clk = of_clk_get(np, 0); + if (!IS_ERR(clk)) { + ret = clk_prepare_enable(clk); + if (ret) + goto out; + rate = clk_get_rate(clk) / 2; + } else if (cpu_is_pj4()) { + rate = 6500000; + } else { + rate = 3250000; + } + irq = irq_of_parse_and_map(np, 0); if (!irq) { ret = -EINVAL; @@ -231,7 +239,7 @@ void __init mmp_dt_init_timer(void) ret = -ENOMEM; goto out; } - timer_init(irq); + timer_init(irq, rate); return; out: pr_err("Failed to get timer from device tree with error:%d\n", ret); |