@@ -224,6 +224,36 @@ static int rcar_sysc_pd_power_on(struct generic_pm_domain *genpd)
return rcar_sysc_power_up(&pd->ch);
}
+#ifdef CONFIG_ARCH_R8A7795
+static int rcar_sysc_attach_dev(struct generic_pm_domain *genpd,
+ struct device *dev)
+{
+ struct gpd_link *link;
+ int error;
+
+ /* Forward call to parent */
+ list_for_each_entry(link, &genpd->slave_links, slave_node)
+ if (link->master && link->master->attach_dev) {
+ error = link->master->attach_dev(link->master, dev);
+ if (error)
+ return error;
+ }
+
+ return 0;
+}
+
+static void rcar_sysc_detach_dev(struct generic_pm_domain *genpd,
+ struct device *dev)
+{
+ struct gpd_link *link;
+
+ /* Forward call to parent */
+ list_for_each_entry(link, &genpd->slave_links, slave_node)
+ if (link->master && link->master->detach_dev)
+ link->master->detach_dev(link->master, dev);
+}
+#endif /* CONFIG_ARCH_R8A7795 */
+
static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd)
{
struct generic_pm_domain *genpd = &pd->genpd;
@@ -249,6 +279,15 @@ static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd)
gov = &pm_domain_always_on_gov;
}
+#ifdef CONFIG_ARCH_R8A7795
+ if (!(pd->flags & (PD_CPU | PD_SCU))) {
+ /* Enable Clock Domain for I/O devices */
+ genpd->flags = GENPD_FLAG_PM_CLK;
+ genpd->attach_dev = rcar_sysc_attach_dev;
+ genpd->detach_dev = rcar_sysc_detach_dev;
+ }
+#endif
+
pm_genpd_init(genpd, gov, false);
genpd->dev_ops.active_wakeup = rcar_sysc_active_wakeup;
genpd->power_off = rcar_sysc_pd_power_off;
On R-Car H3, some power areas (e.g. A3VP) contain I/O devices, which are also part of the CPG/MSSR Clock Domain. Hook up the CPG/MSSR Clock Domain attach/detach callbacks to enable power management using module clocks. This also allows to support the Clock Domain for devices in the "always-on" power area. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- v4: - Remove the explicit dependency on the CPG/MSSR driver by forwarding the attach/detach callbacks to the parent PM Domain. If deemed reusable, rcar_sysc_{at,de}tach_dev() can be moved to common genpd code later. v3: - Hook up the CPG/MSSR Clock Domain attach/detach callbacks instead of using our own copies, v2: - New. --- drivers/soc/renesas/rcar-sysc.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+)