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MIPS/Malta: Probe gic-timer via devicetree

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The Malta platform is the only platform remaining to probe the GIC
clocksource via gic_clocksource_init. This route hardcodes an expected
virq number based on MIPS_GIC_IRQ_BASE, which can be fragile to the
eventual virq layout. Instread, probe the driver using the preferred and
more modern devicetree method.

Before the driver is probed, set the "clock-frequency" property of the
devicetree node to the value detected by Malta platform code.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Link: http://lkml.kernel.org/r/1492604806-23420-1-git-send-email-matt.redfearn@imgtec.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Matt Redfearn 2017-04-19 13:26:45 +01:00 committed by Thomas Gleixner
parent 0773cea374
commit 4287adec72
1 changed files with 30 additions and 1 deletions
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31
arch/mips/mti-malta/malta-time.c
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@ -21,6 +21,7 @@
#include <linux/i8253.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/libfdt.h>
#include <linux/math64.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
@ -207,6 +208,33 @@ static void __init init_rtc(void)
CMOS_WRITE(ctrl & ~RTC_SET, RTC_CONTROL);
}
#ifdef CONFIG_CLKSRC_MIPS_GIC
static u32 gic_frequency_dt;
static struct property gic_frequency_prop = {
.name = "clock-frequency",
.length = sizeof(u32),
.value = &gic_frequency_dt,
};
static void update_gic_frequency_dt(void)
{
struct device_node *node;
gic_frequency_dt = cpu_to_be32(gic_frequency);
node = of_find_compatible_node(NULL, NULL, "mti,gic-timer");
if (!node) {
pr_err("mti,gic-timer device node not found\n");
return;
}
if (of_update_property(node, &gic_frequency_prop) < 0)
pr_err("error updating gic frequency property\n");
}
#endif
void __init plat_time_init(void)
{
unsigned int prid = read_c0_prid() & (PRID_COMP_MASK | PRID_IMP_MASK);
@ -236,7 +264,8 @@ void __init plat_time_init(void)
printk("GIC frequency %d.%02d MHz\n", freq/1000000,
(freq%1000000)*100/1000000);
#ifdef CONFIG_CLKSRC_MIPS_GIC
gic_clocksource_init(gic_frequency);
update_gic_frequency_dt();
clocksource_probe();
#endif
}
#endif