Grygorii Strashko [off-list ref] writes:

This patch switches Keystone 2 PM code to use Generic PM domains
instead of PM  clock domains because of the lack of DT support
for the last.

Keystone 2 PM domain should be specified per device for which
Runtime PM has to be enabled and handles the list of functional clocks
to enable/disable device.

Example:
 qmss_domain: qmss_pm_controller {
	compatible = "ti,keystone-pm-controller";
	clocks = <&chipclk13>;
	#power-domain-cells = <0>;
 };

 qmss: qmss at 2a40000 {
	compatible = "ti,keystone-navigator-qmss";
	...
	power-domains = <&qmss_domain>;

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>

[...]

+static int keystone_pm_domain_power_off(struct generic_pm_domain *genpd)
+{
+	int ret;
+	struct keystone_domain *dm = container_of(genpd,
+						  struct keystone_domain,
+						  base);
+
+	/* Enable reset clocks for all devices in the PU domain */

This says enable clocks...

+	ret = pm_clk_suspend(dm->dev);

...but this calls clk_disable().

+	if (ret)
+		dev_err(dm->dev, "can't turn off clocks %d\n", ret);
+
+	return ret;
+}
+
+static int keystone_pm_domain_power_on(struct generic_pm_domain *genpd)
+{
+	int ret;
+	struct keystone_domain *dm = container_of(genpd,
+						  struct keystone_domain,
+						  base);
+
+	/* Disable reset clocks for all devices in the PU domain */

And this says disable clocks...

+	ret = pm_clk_resume(dm->dev);

...but this calls clk_enable().

-ECONFUSED.

Kevin