| Message ID | 1426708017-28885-2-git-send-email-geert+renesas@glider.be (mailing list archive) |
|---|---|
| State | RFC |
| Headers | show |
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@glider.be> 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 linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Mike, On Tue, Mar 24, 2015 at 04:00:36PM -0700, Michael Turquette wrote: > 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@glider.be> > > Looks good to me. Which tree do you want this patch to go through? My tree seems reasonable from my point of view. Though at this point it would be targeted at v4.2. -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, Mar 25, 2015 at 2:04 AM, Simon Horman <horms@verge.net.au> wrote: > On Tue, Mar 24, 2015 at 04:00:36PM -0700, Michael Turquette wrote: >> 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@glider.be> >> >> Looks good to me. Which tree do you want this patch to go through? > > My tree seems reasonable from my point of view. > Though at this point it would be targeted at v4.2. Definitely. Please give Laurent some time to comment. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Geert, Thank you for the patch. On Wednesday 18 March 2015 20:46:53 Geert Uytterhoeven wrote: > 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@glider.be> There's one thing that bothers me: the implementation is tied to the CPG driver, but the code is quite generic. That feels a bit wrong, it would be nice to come up with a generic implementation. On the other hand, the platform-dependent part is the list of clocks to manage, specified implicitly through the "pm_clk_add(dev, NULL)" call. That list needs to be specified somewhere, and adding it to the CPG driver is likely the best solution we can have at the moment. I'm slightly worried that adding the power-domains property to the DT node will introduce backward compatibility issues if we later switch to a different way to specify the clocks to manage automatically. I have no specific example though. For those reasons, Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > --- > .../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);
On Mon, Mar 30, 2015 at 11:58:10AM +0200, Geert Uytterhoeven wrote: > On Wed, Mar 25, 2015 at 2:04 AM, Simon Horman <horms@verge.net.au> wrote: > > On Tue, Mar 24, 2015 at 04:00:36PM -0700, Michael Turquette wrote: > >> 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@glider.be> > >> > >> Looks good to me. Which tree do you want this patch to go through? > > > > My tree seems reasonable from my point of view. > > Though at this point it would be targeted at v4.2. > > Definitely. Please give Laurent some time to comment. Sure, please post as a non-RFC once you think it is ready. -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Geert Uytterhoeven <geert+renesas@glider.be> writes: > 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@glider.be> Reviewed-by: Kevin Hilman <khilman@linaro.org> -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Laurent, On Tue, Mar 31, 2015 at 1:53 AM, Laurent Pinchart <laurent.pinchart@ideasonboard.com> wrote: > On Wednesday 18 March 2015 20:46:53 Geert Uytterhoeven wrote: >> 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@glider.be> > > There's one thing that bothers me: the implementation is tied to the CPG > driver, but the code is quite generic. That feels a bit wrong, it would be > nice to come up with a generic implementation. On the other hand, the > platform-dependent part is the list of clocks to manage, specified implicitly > through the "pm_clk_add(dev, NULL)" call. That list needs to be specified > somewhere, and adding it to the CPG driver is likely the best solution we can > have at the moment. This clock management code is identical to the one in pm-rmobile.c. We may consolidate in the future, if we have more PM Domain support (e.g. for R-Car Gen2 SYSC). Let's see... > I'm slightly worried that adding the power-domains property to the DT node > will introduce backward compatibility issues if we later switch to a different > way to specify the clocks to manage automatically. I have no specific example > though. Specifying the clocks is indeed the hard part. I use the primary clocks, as that is compatible with what we did in the past in drivers/sh/pm_runtime.c. I thought about using a special clock name instead, but that may conflict with an existing driver-specific DT binding for clk-names, and may cause problems if you have to specify the same clock twice with different clk-names. > For those reasons, > > Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Thanks! Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Geert, On Wednesday 01 April 2015 14:13:12 Geert Uytterhoeven wrote: > On Tue, Mar 31, 2015 at 1:53 AM, Laurent Pinchart wrote: > > On Wednesday 18 March 2015 20:46:53 Geert Uytterhoeven wrote: > >> 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@glider.be> > > > > There's one thing that bothers me: the implementation is tied to the CPG > > driver, but the code is quite generic. That feels a bit wrong, it would be > > nice to come up with a generic implementation. On the other hand, the > > platform-dependent part is the list of clocks to manage, specified > > implicitly through the "pm_clk_add(dev, NULL)" call. That list needs to > > be specified somewhere, and adding it to the CPG driver is likely the > > best solution we can have at the moment. > > This clock management code is identical to the one in pm-rmobile.c. > We may consolidate in the future, if we have more PM Domain support (e.g. > for R-Car Gen2 SYSC). Let's see... > > > I'm slightly worried that adding the power-domains property to the DT node > > will introduce backward compatibility issues if we later switch to a > > different way to specify the clocks to manage automatically. I have no > > specific example though. > > Specifying the clocks is indeed the hard part. I use the primary clocks, as > that is compatible with what we did in the past in drivers/sh/pm_runtime.c. > I thought about using a special clock name instead, but that may conflict > with an existing driver-specific DT binding for clk-names, and may cause > problems if you have to specify the same clock twice with different > clk-names. But we're free to set the rules here, as we're dealing with new code. We could for instance mandate that all Renesas IP cores specify their functional clock as "fck" in DT, and enforce that rule in new drivers. As we're not dealing with external platform devices we should be in full control. If future IP cores require more than one clock to be automatically managed we'll need to come up with a naming scheme anyway, and backward compatibility will need to be taken into account, regardless of whether we use the NULL clock or a named clock today. > > For those reasons, > > > > Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > > Thanks!
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);
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@glider.be> --- .../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(-)