[PATCH v2 2/7] ARM: Exynos: add support for sub-power domains

[PATCH v2 2/7] ARM: Exynos: add support for sub-power domains

[Marek Szyprowski]

This patch adds support for making one power domain a sub-domain of
other domain. This is useful for modeling power dependences for devices
like TV Mixer or Camera ISP, which needs to have more than one power
domain enabled to be operational.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 Documentation/devicetree/bindings/arm/exynos/power_domain.txt |  2 ++
 arch/arm/mach-exynos/pm_domains.c                             | 11 ++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
index abde1ea8a119..b884358ebb1a 100644
--- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
+++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
@@ -22,6 +22,8 @@ Optional Properties:
 	- pclkN, clkN: Pairs of parent of input clock and input clock to the
 		devices in this power domain. Maximum of 4 pairs (N = 0 to 3)
 		are supported currently.
+- samsung,power-domain: phandle to a master power domain that the given domain
+		       is a part of
 
 Node of a device using power domains must have a samsung,power-domain property
 defined with a phandle to respective power domain.
diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
index 20f267121b3e..fa9a47ddad81 100644
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -108,7 +108,7 @@ static int exynos_pd_power_off(struct generic_pm_domain *domain)
 static __init int exynos4_pm_init_power_domain(void)
 {
 	struct platform_device *pdev;
-	struct device_node *np;
+	struct device_node *np, *master_np;
 
 	for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
 		struct exynos_pm_domain *pd;
@@ -159,6 +159,15 @@ no_clk:
 
 		pm_genpd_init(&pd->pd, NULL, !on);
 		of_genpd_add_provider_simple(np, &pd->pd);
+
+		/* make master and slave hierarchy */
+		master_np = of_parse_phandle(np, "samsung,power-domain", 0);
+		if (!master_np)
+			master_np = of_parse_phandle(np, "power-domains", 0);
+		if (master_np) {
+			pm_genpd_add_subdomain_names(master_np->name, np->name);
+			of_node_put(master_np);
+		}
 	}
 
 	return 0;
-- 
1.9.2

Re: [PATCH v2 2/7] ARM: Exynos: add support for sub-power domains

[Geert Uytterhoeven]

Hi Marek,

On Wed, Dec 3, 2014 at 1:33 PM, Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
> diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> index abde1ea8a119..b884358ebb1a 100644
> --- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> +++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> @@ -22,6 +22,8 @@ Optional Properties:
>         - pclkN, clkN: Pairs of parent of input clock and input clock to the
>                 devices in this power domain. Maximum of 4 pairs (N = 0 to 3)
>                 are supported currently.
> +- samsung,power-domain: phandle to a master power domain that the given domain
> +                      is a part of

For new DTSes I'd recommend using the generic "power-domains" only.

Or do you already have a DTS where tv-power-domain@10023C20 uses
"samsung,power-domain" in the wild?

>  Node of a device using power domains must have a samsung,power-domain property
>  defined with a phandle to respective power domain.
> diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
> index 20f267121b3e..fa9a47ddad81 100644
> --- a/arch/arm/mach-exynos/pm_domains.c
> +++ b/arch/arm/mach-exynos/pm_domains.c
> @@ -108,7 +108,7 @@ static int exynos_pd_power_off(struct generic_pm_domain *domain)
>  static __init int exynos4_pm_init_power_domain(void)
>  {
>         struct platform_device *pdev;
> -       struct device_node *np;
> +       struct device_node *np, *master_np;
>
>         for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
>                 struct exynos_pm_domain *pd;
> @@ -159,6 +159,15 @@ no_clk:
>
>                 pm_genpd_init(&pd->pd, NULL, !on);
>                 of_genpd_add_provider_simple(np, &pd->pd);
> +
> +               /* make master and slave hierarchy */
> +               master_np = of_parse_phandle(np, "samsung,power-domain", 0);
> +               if (!master_np)
> +                       master_np = of_parse_phandle(np, "power-domains", 0);
> +               if (master_np) {
> +                       pm_genpd_add_subdomain_names(master_np->name, np->name);
> +                       of_node_put(master_np);
> +               }




-- 
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

Re: [PATCH v2 2/7] ARM: Exynos: add support for sub-power domains

[Marek Szyprowski]

Hello,

On 2014-12-03 13:36, Geert Uytterhoeven wrote:
> Hi Marek,
>
> On Wed, Dec 3, 2014 at 1:33 PM, Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
>> diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
>> index abde1ea8a119..b884358ebb1a 100644
>> --- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
>> +++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
>> @@ -22,6 +22,8 @@ Optional Properties:
>>          - pclkN, clkN: Pairs of parent of input clock and input clock to the
>>                  devices in this power domain. Maximum of 4 pairs (N = 0 to 3)
>>                  are supported currently.
>> +- samsung,power-domain: phandle to a master power domain that the given domain
>> +                      is a part of
> For new DTSes I'd recommend using the generic "power-domains" only.

I think that some consistency in dts style will be really an added 
value. In my opinion for
all existing DTSes we should keep using 'samsung,power-domain' (even for 
defining a parent
power domains) and for all new DTSes, the generic 'power-domains' 
binding should be used.

> Or do you already have a DTS where tv-power-domain@10023C20 uses
> "samsung,power-domain" in the wild?

Not yet. We only used in private repositories, which can be changed.

>
>>   Node of a device using power domains must have a samsung,power-domain property
>>   defined with a phandle to respective power domain.
>> diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
>> index 20f267121b3e..fa9a47ddad81 100644
>> --- a/arch/arm/mach-exynos/pm_domains.c
>> +++ b/arch/arm/mach-exynos/pm_domains.c
>> @@ -108,7 +108,7 @@ static int exynos_pd_power_off(struct generic_pm_domain *domain)
>>   static __init int exynos4_pm_init_power_domain(void)
>>   {
>>          struct platform_device *pdev;
>> -       struct device_node *np;
>> +       struct device_node *np, *master_np;
>>
>>          for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
>>                  struct exynos_pm_domain *pd;
>> @@ -159,6 +159,15 @@ no_clk:
>>
>>                  pm_genpd_init(&pd->pd, NULL, !on);
>>                  of_genpd_add_provider_simple(np, &pd->pd);
>> +
>> +               /* make master and slave hierarchy */
>> +               master_np = of_parse_phandle(np, "samsung,power-domain", 0);
>> +               if (!master_np)
>> +                       master_np = of_parse_phandle(np, "power-domains", 0);
>> +               if (master_np) {
>> +                       pm_genpd_add_subdomain_names(master_np->name, np->name);
>> +                       of_node_put(master_np);
>> +               }
>>

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH v2 2/7] ARM: Exynos: add support for sub-power domains

[Kevin Hilman]

Marek Szyprowski <m.szyprowski@samsung.com> writes:

> Hello,
>
> On 2014-12-03 13:36, Geert Uytterhoeven wrote:
>> Hi Marek,
>>
>> On Wed, Dec 3, 2014 at 1:33 PM, Marek Szyprowski
>> <m.szyprowski@samsung.com> wrote:
>>> diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
>>> index abde1ea8a119..b884358ebb1a 100644
>>> --- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
>>> +++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
>>> @@ -22,6 +22,8 @@ Optional Properties:
>>>          - pclkN, clkN: Pairs of parent of input clock and input clock to the
>>>                  devices in this power domain. Maximum of 4 pairs (N = 0 to 3)
>>>                  are supported currently.
>>> +- samsung,power-domain: phandle to a master power domain that the given domain
>>> +                      is a part of
>> For new DTSes I'd recommend using the generic "power-domains" only.
>
> I think that some consistency in dts style will be really an added
> value. In my opinion for
> all existing DTSes we should keep using 'samsung,power-domain' (even
> for defining a parent
> power domains) and for all new DTSes, the generic 'power-domains'
> binding should be used.

Or even better, convert the existing DTSs to use generic power-domain
first, and then use generic ones going forward also.

Kevin

Re: [PATCH v2 2/7] ARM: Exynos: add support for sub-power domains

[amit daniel kachhap]

On Wed, Dec 3, 2014 at 6:03 PM, Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
> This patch adds support for making one power domain a sub-domain of
> other domain. This is useful for modeling power dependences for devices
> like TV Mixer or Camera ISP, which needs to have more than one power
> domain enabled to be operational.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>  Documentation/devicetree/bindings/arm/exynos/power_domain.txt |  2 ++
>  arch/arm/mach-exynos/pm_domains.c                             | 11 ++++++++++-
>  2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> index abde1ea8a119..b884358ebb1a 100644
> --- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> +++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> @@ -22,6 +22,8 @@ Optional Properties:
>         - pclkN, clkN: Pairs of parent of input clock and input clock to the
>                 devices in this power domain. Maximum of 4 pairs (N = 0 to 3)
>                 are supported currently.
> +- samsung,power-domain: phandle to a master power domain that the given domain
> +                      is a part of
>
>  Node of a device using power domains must have a samsung,power-domain property
>  defined with a phandle to respective power domain.
> diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
> index 20f267121b3e..fa9a47ddad81 100644
> --- a/arch/arm/mach-exynos/pm_domains.c
> +++ b/arch/arm/mach-exynos/pm_domains.c
> @@ -108,7 +108,7 @@ static int exynos_pd_power_off(struct generic_pm_domain *domain)
>  static __init int exynos4_pm_init_power_domain(void)
>  {
>         struct platform_device *pdev;
> -       struct device_node *np;
> +       struct device_node *np, *master_np;
>
>         for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
>                 struct exynos_pm_domain *pd;
> @@ -159,6 +159,15 @@ no_clk:
>
>                 pm_genpd_init(&pd->pd, NULL, !on);
>                 of_genpd_add_provider_simple(np, &pd->pd);
> +
> +               /* make master and slave hierarchy */
> +               master_np = of_parse_phandle(np, "samsung,power-domain", 0);
> +               if (!master_np)
> +                       master_np = of_parse_phandle(np, "power-domains", 0);
> +               if (master_np) {
> +                       pm_genpd_add_subdomain_names(master_np->name, np->name);
> +                       of_node_put(master_np);
> +               }
>         }
Hi Marek,

In the my patch series posted earlier i added this feature in a
slightly different way. (https://lkml.org/lkml/2014/11/24/320)
Parent PD's are not added in the same loop but in the second loop.
This will make sure that the parents PD are registered before the
child PD's and we can get away from the assumption of child/parent
PD's position in the Device Tree. This is a still a work in progress.
Also posted a patch earlier regarding this,
http://www.spinics.net/lists/linux-samsung-soc/msg39836.html.

Regards,
Amit



>
>         return 0;
> --
> 1.9.2
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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Re: [PATCH v2 2/7] ARM: Exynos: add support for sub-power domains

[Marek Szyprowski]

Hello,

On 2014-12-04 04:45, amit daniel kachhap wrote:
> On Wed, Dec 3, 2014 at 6:03 PM, Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
>> This patch adds support for making one power domain a sub-domain of
>> other domain. This is useful for modeling power dependences for devices
>> like TV Mixer or Camera ISP, which needs to have more than one power
>> domain enabled to be operational.
>>
>> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
>> ---
>>   Documentation/devicetree/bindings/arm/exynos/power_domain.txt |  2 ++
>>   arch/arm/mach-exynos/pm_domains.c                             | 11 ++++++++++-
>>   2 files changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
>> index abde1ea8a119..b884358ebb1a 100644
>> --- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
>> +++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
>> @@ -22,6 +22,8 @@ Optional Properties:
>>          - pclkN, clkN: Pairs of parent of input clock and input clock to the
>>                  devices in this power domain. Maximum of 4 pairs (N = 0 to 3)
>>                  are supported currently.
>> +- samsung,power-domain: phandle to a master power domain that the given domain
>> +                      is a part of
>>
>>   Node of a device using power domains must have a samsung,power-domain property
>>   defined with a phandle to respective power domain.
>> diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
>> index 20f267121b3e..fa9a47ddad81 100644
>> --- a/arch/arm/mach-exynos/pm_domains.c
>> +++ b/arch/arm/mach-exynos/pm_domains.c
>> @@ -108,7 +108,7 @@ static int exynos_pd_power_off(struct generic_pm_domain *domain)
>>   static __init int exynos4_pm_init_power_domain(void)
>>   {
>>          struct platform_device *pdev;
>> -       struct device_node *np;
>> +       struct device_node *np, *master_np;
>>
>>          for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
>>                  struct exynos_pm_domain *pd;
>> @@ -159,6 +159,15 @@ no_clk:
>>
>>                  pm_genpd_init(&pd->pd, NULL, !on);
>>                  of_genpd_add_provider_simple(np, &pd->pd);
>> +
>> +               /* make master and slave hierarchy */
>> +               master_np = of_parse_phandle(np, "samsung,power-domain", 0);
>> +               if (!master_np)
>> +                       master_np = of_parse_phandle(np, "power-domains", 0);
>> +               if (master_np) {
>> +                       pm_genpd_add_subdomain_names(master_np->name, np->name);
>> +                       of_node_put(master_np);
>> +               }
>>          }
> Hi Marek,
>
> In the my patch series posted earlier i added this feature in a
> slightly different way. (https://lkml.org/lkml/2014/11/24/320)
> Parent PD's are not added in the same loop but in the second loop.
> This will make sure that the parents PD are registered before the
> child PD's and we can get away from the assumption of child/parent
> PD's position in the Device Tree. This is a still a work in progress.
> Also posted a patch earlier regarding this,
> http://www.spinics.net/lists/linux-samsung-soc/msg39836.html.

Right, your approach seems to be more error prone. Do you plan to resend 
your
patch with the parent domain phandle renamed to generic 'power-domains' 
property,
like Geert suggested?

I would like to send Exynos4 HDMI patches based on top of your work and 
have them
finally merged (they are waiting since v3.17...)

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland