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Date: Wed, 05 Mar 2014 17:15:54 +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
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?
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
> - if (!node)
> - return;
> - pd_pdev = of_find_device_by_node(node);
> - if (!pd_pdev)
> - return;
> - pd = platform_get_drvdata(pd_pdev);
> - exynos_add_device_to_domain(pd, dev);
> -}
> -
> -static int exynos_pm_notifier_call(struct notifier_block *nb,
> - unsigned long event, void *data)
> -{
> - struct device *dev = data;
> -
> - switch (event) {
> - case BUS_NOTIFY_BIND_DRIVER:
> - if (dev->of_node)
> - exynos_read_domain_from_dt(dev);
> -
> - break;
> -
> - case BUS_NOTIFY_UNBOUND_DRIVER:
> - exynos_remove_device_from_domain(dev);
> -
> - break;
> - }
> - return NOTIFY_DONE;
> -}
> -
> -static struct notifier_block platform_nb = {
> - .notifier_call = exynos_pm_notifier_call,
> -};
> -
> static __init int exynos4_pm_init_power_domain(void)
> {
> struct platform_device *pdev;
> @@ -156,8 +84,6 @@ static __init int exynos4_pm_init_power_domain(void)
> struct exynos_pm_domain *pd;
> int on;
>
> - pdev = of_find_device_by_node(np);
> -
> pd = kzalloc(sizeof(*pd), GFP_KERNEL);
> if (!pd) {
> pr_err("%s: failed to allocate memory for domain\n",
> @@ -170,17 +96,13 @@ static __init int exynos4_pm_init_power_domain(void)
> pd->base = of_iomap(np, 0);
> pd->pd.power_off = exynos_pd_power_off;
> pd->pd.power_on = exynos_pd_power_on;
> - pd->pd.of_node = np;
> -
> - platform_set_drvdata(pdev, pd);
>
> on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
>
> pm_genpd_init(&pd->pd, NULL, !on);
> + of_genpd_add_provider(np, of_genpd_xlate_simple, &pd->pd);
> }
>
> - bus_register_notifier(&platform_bus_type, &platform_nb);
> -
> return 0;
> }
> arch_initcall(exynos4_pm_init_power_domain);
> diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
> index 45aa98e..b17588c 100644
> --- a/kernel/power/Kconfig
> +++ b/kernel/power/Kconfig
> @@ -308,7 +308,7 @@ config PM_GENERIC_DOMAINS_RUNTIME
>
> config PM_GENERIC_DOMAINS_OF
> def_bool y
> - depends on PM_GENERIC_DOMAINS && OF && !ARCH_EXYNOS
> + depends on PM_GENERIC_DOMAINS && OF
>
> config CPU_PM
> bool
--
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