[01/10] clk: renesas: mstp: Keep wakeup sources active during system suspend

Commit Message

Geert Uytterhoeven Oct. 16, 2017, 1:55 p.m. UTC

If a device is part of the CPG/MSTP Clock Domain and to be used as a
wakeup source, it must be kept active during system suspend.

Currently this is handled in device-specific drivers by explicitly
increasing the use count of the module clock when the device is
configured as a wakeup source.  However, the proper way to prevent the
device from being stopped is to inform this requirement to the genpd
core.

Hence provide an .active_wakeup() callback that always returns true.
Note that this will only affect devices configured as wakeup sources.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
---
 drivers/clk/renesas/clk-mstp.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch

diff --git a/drivers/clk/renesas/clk-mstp.c b/drivers/clk/renesas/clk-mstp.c
index 500a9e4e03c48957..912e4745d8011fe8 100644
--- a/drivers/clk/renesas/clk-mstp.c
+++ b/drivers/clk/renesas/clk-mstp.c
@@ -329,6 +329,11 @@  void cpg_mstp_detach_dev(struct generic_pm_domain *unused, struct device *dev)
 		pm_clk_destroy(dev);
 }
 
+static bool cpg_mstp_active_wakeup(struct device *dev)
+{
+	return true;
+}
+
 void __init cpg_mstp_add_clk_domain(struct device_node *np)
 {
 	struct generic_pm_domain *pd;
@@ -345,6 +350,7 @@  void __init cpg_mstp_add_clk_domain(struct device_node *np)
 
 	pd->name = np->name;
 	pd->flags = GENPD_FLAG_PM_CLK;
+	pd->dev_ops.active_wakeup = cpg_mstp_active_wakeup;
 	pd->attach_dev = cpg_mstp_attach_dev;
 	pd->detach_dev = cpg_mstp_detach_dev;
 	pm_genpd_init(pd, &pm_domain_always_on_gov, false);