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| author | Tim Kryger <tim.kryger@linaro.org> | 2013-12-05 11:20:43 -0800 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2014-01-31 21:04:01 -0800 |
| commit | 50ac206102660fe29e75d8a685178db95c530f4f (patch) | |
| tree | d033fa45dffe2d34260feefe9d8bce9b14610a75 | |
| parent | 7c762036e2480bfd43e62ed872b82e372fe92474 (diff) | |
| download | linux-stable-50ac206102660fe29e75d8a685178db95c530f4f.tar.gz linux-stable-50ac206102660fe29e75d8a685178db95c530f4f.tar.bz2 linux-stable-50ac206102660fe29e75d8a685178db95c530f4f.zip | |
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: Tim Kryger <tim.kryger@linaro.org>
Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
Reviewed-by: Matt Porter <matt.porter@linaro.org>
Reviewed-by: Christian Daudt <bcm@fixthebug.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Christian Daudt <bcm@fixthebug.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
| -rw-r--r-- | drivers/clocksource/bcm_kona_timer.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/clocksource/bcm_kona_timer.c b/drivers/clocksource/bcm_kona_timer.c index 5176e761166b..974b2db2fe10 100644 --- a/drivers/clocksource/bcm_kona_timer.c +++ b/drivers/clocksource/bcm_kona_timer.c @@ -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); |