lkml.org 
[lkml]   [2013]   [Dec]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4 7/8] clocksource: kona: Add basic use of external clock
On 12/05/2013 08:20 PM, Tim Kryger wrote:
> 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>

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>

> ---
> drivers/clocksource/bcm_kona_timer.c | 14 +++++++++++---
> 1 file changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/clocksource/bcm_kona_timer.c b/drivers/clocksource/bcm_kona_timer.c
> index 0d7d8c3..8a4ab36 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>
> @@ -107,11 +108,18 @@ static const struct of_device_id bcm_timer_ids[] __initconst = {
> 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);
>


--
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2013-12-16 12:01    [W:0.408 / U:0.188 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site