On 20 April 2016 at 14:02, Geert Uytterhoeven <geert+renesas@xxxxxxxxx> wrote: > On R-Car H3, some power areas (e.g. A3VP) contain I/O devices, which are > also part of the CPG/MSSR Clock Domain. > On all R-Car SoCs, devices in the "always-on" PM Domain are part of the > Clock Domain served by the CPG/MSSR or CPG/MSTP driver. > > Hook up the CPG/MSTP or CPG/MSSR Clock Domain attach/detach callbacks to > enable power management using module clocks. Which callback to hook up > depends on the presence of device nodes compatible with > "renesas,cpg-mstp-clocks". This clears the path for a future migration > from the CPG/MSTP to the CPG/MSSR driver on R-Car H1 and > Gen2. > > Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> > Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> > --- > v6: > - Add Reviewed-by, > - Rebased, > > v5: > - Revert v4 changes, > - Use either the cpg_mssr_*() or cpg_mstp_*() callbacks, > - Drop dependency on r8a7795, as this is used for the "always-on" PM > Domain on R-Car H1 and Gen2, too, > > 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 | 18 ++++++++++++++++++ > 1 file changed, 18 insertions(+) > > diff --git a/drivers/soc/renesas/rcar-sysc.c b/drivers/soc/renesas/rcar-sysc.c > index 4e760d63f2abd93f..0d49a25de740fbf8 100644 > --- a/drivers/soc/renesas/rcar-sysc.c > +++ b/drivers/soc/renesas/rcar-sysc.c > @@ -9,6 +9,7 @@ > * for more details. > */ > > +#include <linux/clk/renesas.h> > #include <linux/delay.h> > #include <linux/err.h> > #include <linux/mm.h> > @@ -217,6 +218,8 @@ static int rcar_sysc_pd_power_on(struct generic_pm_domain *genpd) > return rcar_sysc_power_up(&pd->ch); > } > > +static bool has_cpg_mstp; > + That's seems lazy. :-) Sure you can provide this as an input parameter to rcar_sysc_pd_setup() instead, no? > static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd) > { > struct generic_pm_domain *genpd = &pd->genpd; > @@ -248,6 +251,18 @@ static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd) > gov = &pm_domain_always_on_gov; > } > > + if (!(pd->flags & (PD_CPU | PD_SCU))) { > + /* Enable Clock Domain for I/O devices */ > + genpd->flags = GENPD_FLAG_PM_CLK; > + if (has_cpg_mstp) { > + genpd->attach_dev = cpg_mstp_attach_dev; > + genpd->detach_dev = cpg_mstp_detach_dev; > + } else { > + genpd->attach_dev = cpg_mssr_attach_dev; > + genpd->detach_dev = cpg_mssr_detach_dev; > + } > + } > + > genpd->power_off = rcar_sysc_pd_power_off; > genpd->power_on = rcar_sysc_pd_power_on; > > @@ -294,6 +309,9 @@ static int __init rcar_sysc_pd_init(void) > > info = match->data; > > + has_cpg_mstp = of_find_compatible_node(NULL, NULL, > + "renesas,cpg-mstp-clocks"); > + > base = of_iomap(np, 0); > if (!base) { > pr_warn("%s: Cannot map regs\n", np->full_name); > -- > 1.9.1 > Kind regards Uffe