[02/10] clk: renesas: cpg-mssr: 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/MSSR 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/renesas-cpg-mssr.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch

diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
index e580a5e6346c2533..de534896f596168c 100644
--- a/drivers/clk/renesas/renesas-cpg-mssr.c
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -481,6 +481,11 @@  void cpg_mssr_detach_dev(struct generic_pm_domain *unused, struct device *dev)
 		pm_clk_destroy(dev);
 }
 
+static bool cpg_mssr_active_wakeup(struct device *dev)
+{
+	return true;
+}
+
 static int __init cpg_mssr_add_clk_domain(struct device *dev,
 					  const unsigned int *core_pm_clks,
 					  unsigned int num_core_pm_clks)
@@ -501,6 +506,7 @@  static int __init cpg_mssr_add_clk_domain(struct device *dev,
 	genpd = &pd->genpd;
 	genpd->name = np->name;
 	genpd->flags = GENPD_FLAG_PM_CLK;
+	genpd->dev_ops.active_wakeup = cpg_mssr_active_wakeup;
 	genpd->attach_dev = cpg_mssr_attach_dev;
 	genpd->detach_dev = cpg_mssr_detach_dev;
 	pm_genpd_init(genpd, &pm_domain_always_on_gov, false);