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Commit 50ac2061 authored by Tim Kryger's avatar Tim Kryger Committed by Olof Johansson
Browse files

clocksource: kona: Add basic use of external clock 



When an clock is specified in the device tree, enable it and use it to
determine the external clock frequency.

Signed-off-by: default avatarTim Kryger <tim.kryger@linaro.org>
Reviewed-by: default avatarMarkus Mayer <markus.mayer@linaro.org>
Reviewed-by: default avatarMatt Porter <matt.porter@linaro.org>
Reviewed-by: default avatarChristian Daudt <bcm@fixthebug.org>
Acked-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: default avatarChristian Daudt <bcm@fixthebug.org>
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parent 7c762036

drivers/clocksource/bcm_kona_timer.c

+11 −3
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/jiffies.h>

#include <linux/clockchips.h>

#include <linux/types.h>

#include <linux/clk.h>



#include <linux/io.h>

#include <asm/mach/time.h>
@@ -101,11 +102,18 @@ kona_timer_get_counter(void *timer_base, uint32_t *msw, uint32_t *lsw) 
static void __init kona_timers_init(struct device_node *node)

{

	u32 freq;

	struct clk *external_clk;



	if (!of_property_read_u32(node, "clock-frequency", &freq))

	external_clk = of_clk_get_by_name(node, NULL);



	if (!IS_ERR(external_clk)) {

		arch_timer_rate = clk_get_rate(external_clk);

		clk_prepare_enable(external_clk);

	} else if (!of_property_read_u32(node, "clock-frequency", &freq)) {

		arch_timer_rate = freq;

	else

		panic("clock-frequency not set in the .dts file");

	} else {

		panic("unable to determine clock-frequency");

	}



	/* Setup IRQ numbers */

	timers.tmr_irq = irq_of_parse_and_map(node, 0);