From: Viresh Kumar <viresh.kumar@linaro.org>
Date: Tue, 12 Feb 2019 07:06:47 +0000 (+0530)
Subject: cpufreq: dt: Implement online/offline() callbacks
X-Git-Tag: submit/tizen/20190329.020226~71
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=85d986cd0f071770713d94ff5eb4adcaff24fecf;p=platform%2Fkernel%2Flinux-exynos.git

cpufreq: dt: Implement online/offline() callbacks

Implement the light-weight tear down and bring up helpers to reduce the
amount of work to do on CPU offline/online operation.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
[pending patch for mainline]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Change-Id: I02a01f0f4d5c24102bcc58089937c371cc126b65
---

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index ca6ee9f389b6..16488065ebaf 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -295,6 +295,21 @@ out_put_clk:
 	return ret;
 }
 
+static int cpufreq_online(struct cpufreq_policy *policy)
+{
+	/* We did light-weight tear down earlier, nothing to do here */
+	return 0;
+}
+
+static int cpufreq_offline(struct cpufreq_policy *policy)
+{
+	/*
+	 * Preserve policy->driver_data and don't free resources on light-weight
+	 * tear down.
+	 */
+	return 0;
+}
+
 static int cpufreq_exit(struct cpufreq_policy *policy)
 {
 	struct private_data *priv = policy->driver_data;
@@ -352,6 +367,8 @@ static struct cpufreq_driver dt_cpufreq_driver = {
 	.init = cpufreq_init,
 	.exit = cpufreq_exit,
 	.ready = cpufreq_ready,
+	.online = cpufreq_online,
+	.offline = cpufreq_offline,
 	.name = "cpufreq-dt",
 	.attr = cpufreq_dt_attr,
 	.suspend = cpufreq_generic_suspend,