Hi Karol,
I guess this patch series is not complete and use case implementation
will be more helpful for clarity. Also I can think of another way in
which this complete implementation can be done with pd name as
something "pd-virt". This pd can be handled differently inside the
platform specific exynos power off/on function.
Regards,
Amit D
On Thu, Jan 29, 2015 at 11:42 PM, Karol Wrona <k.wrona@xxxxxxxxxxx> wrote:
> There are the power domains which are turned off or put to retention only during
> suspend or special processor states. In such case there is a need to register
> some devices which belong to such domain that PM core could know the state of
> such devices and decide which power mode should be chosen i.e. the domain can
> not be put to retention if some devices are active. Virtual power domain has
> empty power_on/off callbacks as there is no need to gate anything.
>
> Signed-off-by: Karol Wrona <k.wrona@xxxxxxxxxxx>
> ---
> drivers/base/power/Makefile | 3 +-
> drivers/base/power/pm_domains_virt.c | 54 ++++++++++++++++++++++++++++++++++
> 2 files changed, 56 insertions(+), 1 deletion(-)
> create mode 100644 drivers/base/power/pm_domains_virt.c
>
> diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile
> index 1cb8544..360a0e2 100644
> --- a/drivers/base/power/Makefile
> +++ b/drivers/base/power/Makefile
> @@ -2,7 +2,8 @@ obj-$(CONFIG_PM) += sysfs.o generic_ops.o common.o qos.o runtime.o
> obj-$(CONFIG_PM_SLEEP) += main.o wakeup.o
> obj-$(CONFIG_PM_TRACE_RTC) += trace.o
> obj-$(CONFIG_PM_OPP) += opp.o
> -obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain.o domain_governor.o
> +obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain.o domain_governor.o \
> + pm_domains_virt.o
> obj-$(CONFIG_HAVE_CLK) += clock_ops.o
>
> ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
> diff --git a/drivers/base/power/pm_domains_virt.c b/drivers/base/power/pm_domains_virt.c
> new file mode 100644
> index 0000000..bd4d6b6
> --- /dev/null
> +++ b/drivers/base/power/pm_domains_virt.c
> @@ -0,0 +1,54 @@
> +/*
> + * Copyright (C) 2015, Samsung Electronics Co. Ltd. All Rights Reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <linux/err.h>
> +#include <linux/of.h>
> +#include <linux/pm_domain.h>
> +#include <linux/slab.h>
> +
> +static int pd_power_off(struct generic_pm_domain *domain)
> +{
> + return 0;
> +}
> +
> +static int pd_power_on(struct generic_pm_domain *domain)
> +{
> + return 0;
> +}
> +
> +int __init virt_pm_domains_init(void)
> +{
> + struct device_node *np;
> +
> + for_each_compatible_node(np, NULL, "linux,virtual-pm-domains") {
> + struct generic_pm_domain *pd;
> +
> + pd = kzalloc(sizeof(*pd), GFP_KERNEL);
> + if (!pd)
> + return -ENOMEM;
> +
> + pd->power_off = pd_power_off;
> + pd->power_on = pd_power_on;
> + pd->name = kstrdup(np->name, GFP_KERNEL);
> + if (!pd->name)
> + return -ENOMEM;
> +
> + pm_genpd_init(pd, NULL, false);
> + of_genpd_add_provider_simple(np, pd);
> + }
> +
> + return 0;
> +}
> +arch_initcall(virt_pm_domains_init);
> --
> 1.7.9.5
>
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