Quoting Geert Uytterhoeven (2015-03-18 12:46:53) > Add Clock Domain support to the R-Car Gen2 Clock Pulse Generator (CPG) > driver using the generic PM Domain. This allows to power-manage the > module clocks of SoC devices that are part of the CPG Clock Domain using > Runtime PM, or for system suspend/resume. > > SoC devices that are part of the CPG Clock Domain and can be > power-managed through their primary clock should be tagged in DT with a > proper "power-domains" property. > > Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> Looks good to me. Which tree do you want this patch to go through? Regards, Mike > --- > .../clock/renesas,rcar-gen2-cpg-clocks.txt | 26 ++++++++- > arch/arm/mach-shmobile/Kconfig | 1 + > drivers/clk/shmobile/clk-rcar-gen2.c | 63 ++++++++++++++++++++++ > 3 files changed, 88 insertions(+), 2 deletions(-) > > diff --git a/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt > index b02944fba9de4f86..fc013f225a348929 100644 > --- a/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt > +++ b/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt > @@ -2,6 +2,8 @@ > > The CPG generates core clocks for the R-Car Gen2 SoCs. It includes three PLLs > and several fixed ratio dividers. > +The CPG also provides a Clock Domain for SoC devices, in combination with the > +CPG Module Stop (MSTP) Clocks. > > Required Properties: > > @@ -20,10 +22,18 @@ Required Properties: > - clock-output-names: The names of the clocks. Supported clocks are "main", > "pll0", "pll1", "pll3", "lb", "qspi", "sdh", "sd0", "sd1", "z", "rcan", and > "adsp" > + - #power-domain-cells: Must be 0 > > +SoC devices that are part of the CPG Clock Domain and can be power-managed > +through their primary clock should refer to the CPG device node in their > +"power-domains" property, as documented by the generic PM domain bindings in > +Documentation/devicetree/bindings/power/power_domain.txt. > > -Example > -------- > + > +Examples > +-------- > + > + - CPG device node: > > cpg_clocks: cpg_clocks@e6150000 { > compatible = "renesas,r8a7790-cpg-clocks", > @@ -34,4 +44,16 @@ Example > clock-output-names = "main", "pll0, "pll1", "pll3", > "lb", "qspi", "sdh", "sd0", "sd1", "z", > "rcan", "adsp"; > + #power-domain-cells = <0>; > + }; > + > + > + - CPG Clock Domain member node: > + > + thermal@e61f0000 { > + compatible = "renesas,thermal-r8a7790", "renesas,rcar-thermal"; > + reg = <0 0xe61f0000 0 0x14>, <0 0xe61f0100 0 0x38>; > + interrupts = <0 69 IRQ_TYPE_LEVEL_HIGH>; > + clocks = <&mstp5_clks R8A7790_CLK_THERMAL>; > + power-domains = <&cpg_clocks>; > }; > diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig > index 0fb484221c90e0eb..048101a3253c52de 100644 > --- a/arch/arm/mach-shmobile/Kconfig > +++ b/arch/arm/mach-shmobile/Kconfig > @@ -4,6 +4,7 @@ config ARCH_SHMOBILE > > config PM_RCAR > bool > + select PM_GENERIC_DOMAINS > > config PM_RMOBILE > bool > diff --git a/drivers/clk/shmobile/clk-rcar-gen2.c b/drivers/clk/shmobile/clk-rcar-gen2.c > index acfb6d7dbd6bc049..b54439d3722a13ad 100644 > --- a/drivers/clk/shmobile/clk-rcar-gen2.c > +++ b/drivers/clk/shmobile/clk-rcar-gen2.c > @@ -18,6 +18,8 @@ > #include <linux/math64.h> > #include <linux/of.h> > #include <linux/of_address.h> > +#include <linux/pm_clock.h> > +#include <linux/pm_domain.h> > #include <linux/spinlock.h> > > struct rcar_gen2_cpg { > @@ -364,6 +366,65 @@ rcar_gen2_cpg_register_clock(struct device_node *np, struct rcar_gen2_cpg *cpg, > 4, 0, table, &cpg->lock); > } > > +#ifdef CONFIG_PM_GENERIC_DOMAINS_OF > +static int cpg_pd_attach_dev(struct generic_pm_domain *domain, > + struct device *dev) > +{ > + int error; > + > + error = pm_clk_create(dev); > + if (error) { > + dev_err(dev, "pm_clk_create failed %d\n", error); > + return error; > + } > + > + error = pm_clk_add(dev, NULL); > + if (error) { > + dev_err(dev, "pm_clk_add failed %d\n", error); > + goto fail; > + } > + > + return 0; > + > +fail: > + pm_clk_destroy(dev); > + return error; > +} > + > +static void cpg_pd_detach_dev(struct generic_pm_domain *domain, > + struct device *dev) > +{ > + pm_clk_destroy(dev); > +} > + > +static void __init rcar_gen2_cpg_add_pm_domain(struct device_node *np) > +{ > + struct generic_pm_domain *pd; > + u32 ncells; > + > + if (of_property_read_u32(np, "#power-domain-cells", &ncells)) { > + pr_warn("%s lacks #power-domain-cells. Clocks may fail.\n", > + np->full_name); > + return; > + } > + > + pd = kzalloc(sizeof(*pd), GFP_KERNEL); > + if (!pd) > + return; > + > + pd->name = np->name; > + > + pd->flags = GENPD_FLAG_PM_CLK; > + pm_genpd_init(pd, &simple_qos_governor, false); > + pd->attach_dev = cpg_pd_attach_dev; > + pd->detach_dev = cpg_pd_detach_dev; > + > + of_genpd_add_provider_simple(np, pd); > +} > +#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */ > +static inline void rcar_gen2_cpg_add_pm_domain(struct device_node *np) {} > +#endif /* !CONFIG_PM_GENERIC_DOMAINS_OF */ > + > static void __init rcar_gen2_cpg_clocks_init(struct device_node *np) > { > const struct cpg_pll_config *config; > @@ -415,6 +476,8 @@ static void __init rcar_gen2_cpg_clocks_init(struct device_node *np) > } > > of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data); > + > + rcar_gen2_cpg_add_pm_domain(np); > } > CLK_OF_DECLARE(rcar_gen2_cpg_clks, "renesas,rcar-gen2-cpg-clocks", > rcar_gen2_cpg_clocks_init); > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html