[PATCH] cpufreq-dt: add suspend frequency support

From: Bartlomiej Zolnierkiewicz
Date: Wed Sep 02 2015 - 12:43:17 EST

Add suspend frequency support and set it to the boot frequency,
this matches what the old exynos-cpufreq driver has been doing.

This patch fixes suspend/resume support on Exynos4412 based
Trats2 board and reboot hang on Exynos4412 based Odroid U3

Cc: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Cc: Thomas Abraham <thomas.ab@xxxxxxxxxxx>
Cc: Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx>
Cc: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Tobias Jakobi <tjakobi@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
This patch supersedes "[PATCH] ARM: dts: exynos4412-odroid-*: add
workaround for CPUfreq/reboot issue" one from yesterday.

drivers/cpufreq/cpufreq-dt.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index c3583cd..c9138c7 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -329,6 +329,10 @@ static int cpufreq_init(struct cpufreq_policy *policy)
policy->driver_data = priv;

policy->clk = cpu_clk;
+ /* capture boot frequency */
+ policy->suspend_freq = clk_get_rate(cpu_clk) / 1000;;
ret = cpufreq_table_validate_and_show(policy, freq_table);
if (ret) {
dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
@@ -419,6 +423,9 @@ static struct cpufreq_driver dt_cpufreq_driver = {
.ready = cpufreq_ready,
.name = "cpufreq-dt",
.attr = cpufreq_dt_attr,
+#ifdef CONFIG_PM
+ .suspend = cpufreq_generic_suspend,

static int dt_cpufreq_probe(struct platform_device *pdev)

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