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Date: Fri, 07 Mar 2014 14:04:16 +0100
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To: Tomasz Figa <tomasz.figa@...il.com>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
Russell King <linux@....linux.org.uk>,
Kukjin Kim <kgene.kim@...sung.com>,
Kumar Gala <galak@...eaurora.org>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Mark Rutland <mark.rutland@....com>,
Pawel Moll <pawel.moll@....com>,
Rob Herring <robh+dt@...nel.org>,
Stephen Warren <swarren@...dotorg.org>,
Tomasz Figa <t.figa@...sung.com>,
Mark Brown <broonie@...nel.org>,
Stephen Boyd <sboyd@...eaurora.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Ulf Hansson <ulf.hansson@...aro.org>,
Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH v2 03/11] ARM: exynos: Move to generic power domain bindings
On Wednesday, March 05, 2014 05:20:05 PM Tomasz Figa wrote:
> Hi Bartek,
>
> On 05.03.2014 17:15, Bartlomiej Zolnierkiewicz wrote:
> >
> > Hi Tomek,
> >
> > On Monday, March 03, 2014 05:02:08 PM Tomasz Figa wrote:
> >> This patch moves Exynos power domain code to use the new generic power
> >> domain look-up framework introduced by previous patch, allowing the new
> >> code to be compiled with CONFIG_ARCH_EXYNOS selected as well.
> >>
> >> Signed-off-by: Tomasz Figa <tomasz.figa@...il.com>
> >> ---
> >> .../bindings/arm/exynos/power_domain.txt | 12 ++--
> >> arch/arm/mach-exynos/pm_domains.c | 80 +---------------------
> >> kernel/power/Kconfig | 2 +-
> >> 3 files changed, 7 insertions(+), 87 deletions(-)
> >>
> >> diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> >> index 5216b41..60f26a8 100644
> >> --- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> >> +++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> >> @@ -8,6 +8,8 @@ Required Properties:
> >> * samsung,exynos4210-pd - for exynos4210 type power domain.
> >> - reg: physical base address of the controller and length of memory mapped
> >> region.
> >> +- #power-domain-cells: number of cells in power domain specifier;
> >> + must be 0.
> >>
> >> Node of a device using power domains must have a samsung,power-domain property
> >> defined with a phandle to respective power domain.
> >> @@ -17,12 +19,8 @@ Example:
> >> lcd0: power-domain-lcd0 {
> >> compatible = "samsung,exynos4210-pd";
> >> reg = <0x10023C00 0x10>;
> >> + #power-domain-cells = <0>;
> >> };
> >>
> >> -Example of the node using power domain:
> >> -
> >> - node {
> >> - /* ... */
> >> - samsung,power-domain = <&lcd0>;
> >> - /* ... */
> >> - };
> >> +See Documentation/devicetree/bindings/power/power_domain.txt for description
> >> +of consumer-side bindings.
> >> diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
> >> index 8fd2488..48ee6c9 100644
> >> --- a/arch/arm/mach-exynos/pm_domains.c
> >> +++ b/arch/arm/mach-exynos/pm_domains.c
> >> @@ -75,78 +75,6 @@ static int exynos_pd_power_off(struct generic_pm_domain *domain)
> >> return exynos_pd_power(domain, false);
> >> }
> >>
> >> -static void exynos_add_device_to_domain(struct exynos_pm_domain *pd,
> >> - struct device *dev)
> >> -{
> >> - int ret;
> >> -
> >> - dev_dbg(dev, "adding to power domain %s\n", pd->pd.name);
> >> -
> >> - while (1) {
> >> - ret = pm_genpd_add_device(&pd->pd, dev);
> >> - if (ret != -EAGAIN)
> >> - break;
> >> - cond_resched();
> >> - }
> >> -
> >> - pm_genpd_dev_need_restore(dev, true);
> >> -}
> >> -
> >> -static void exynos_remove_device_from_domain(struct device *dev)
> >> -{
> >> - struct generic_pm_domain *genpd = dev_to_genpd(dev);
> >> - int ret;
> >> -
> >> - dev_dbg(dev, "removing from power domain %s\n", genpd->name);
> >> -
> >> - while (1) {
> >> - ret = pm_genpd_remove_device(genpd, dev);
> >> - if (ret != -EAGAIN)
> >> - break;
> >> - cond_resched();
> >> - }
> >> -}
> >> -
> >> -static void exynos_read_domain_from_dt(struct device *dev)
> >> -{
> >> - struct platform_device *pd_pdev;
> >> - struct exynos_pm_domain *pd;
> >> - struct device_node *node;
> >> -
> >> - node = of_parse_phandle(dev->of_node, "samsung,power-domain", 0);
> >
> > This removes "samsung,power-domain" phandle handling but I cannot find
> > in your patch series updates to existing EXYNOS dts files converting
> > them to use the new "power-domain" property. Am I missing something?
>
> Patch 01/11 adds generic parsing code along with fallback to the legacy
> "samsung,power-domain" property, if the generic one is not present, as
> it was pretty straightforward to implement it there.
Ah, silly me, I should have looked more closely at patch #1. Anyway,
I tested your patchset on Exynos4412 Trats2 target and it works fine
(BTW it also seems that your patchset fixed the issue of device not
being removed from power domain on ->probe failure).
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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