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 <[email protected]> --- 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(+) diff --git a/drivers/soc/renesas/rcar-sysc.c b/drivers/soc/renesas/rcar-sysc.c index bdab8ac6803300e7..6fad1311133a3ac7 100644 --- a/drivers/soc/renesas/rcar-sysc.c +++ b/drivers/soc/renesas/rcar-sysc.c @@ -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; -- 1.9.1
