linux-kernel - Re: [PATCH 2/7] PM / Domains: Make it possible to use per-device .active

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Message-ID: <Pine.LNX.4.64.1111081054070.10851@axis700.grange>
Date:	Tue, 8 Nov 2011 11:27:43 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Kevin Hilman <khilman@...com>, jean.pihet@...oldbits.com
Subject: Re: [PATCH 2/7] PM / Domains: Make it possible to use per-device
 .active_wakeup()

On Mon, 7 Nov 2011, Rafael J. Wysocki wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> The current generic PM domains code requires that the same
> .active_wakeup() device callback routine be used for all devices in
> the given domain, which is inflexible and may not cover some specific
> use cases.  For this reason, make it possible to use device specific
> .active_wakeup() callback routines by adding a corresponding callback
> pointer to struct generic_pm_domain_data.  To reduce code duplication
> use struct gpd_dev_ops to represent PM domain device callbacks as
> well as device-specific ones and add a macro for defining routines
> that will execute those callbacks.
> 
> Modify the shmobile's power domains code to allow drivers to use
> their own .active_wakeup() callback routines.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
>  arch/arm/mach-shmobile/pm-sh7372.c |   11 ++++---
>  drivers/base/power/domain.c        |   54 ++++++++++++++++++-------------------
>  include/linux/pm_domain.h          |   15 ++++------
>  3 files changed, 41 insertions(+), 39 deletions(-)
> 
> Index: linux/include/linux/pm_domain.h
> ===================================================================
> --- linux.orig/include/linux/pm_domain.h
> +++ linux/include/linux/pm_domain.h
> @@ -23,6 +23,12 @@ struct dev_power_governor {
>  	bool (*power_down_ok)(struct dev_pm_domain *domain);
>  };
>  
> +struct gpd_dev_ops {
> +	int (*start)(struct device *dev);
> +	int (*stop)(struct device *dev);
> +	bool (*active_wakeup)(struct device *dev);
> +};
> +
>  struct generic_pm_domain {
>  	struct dev_pm_domain domain;	/* PM domain operations */
>  	struct list_head gpd_list_node;	/* Node in the global PM domains list */
> @@ -45,9 +51,7 @@ struct generic_pm_domain {
>  	bool dev_irq_safe;	/* Device callbacks are IRQ-safe */
>  	int (*power_off)(struct generic_pm_domain *domain);
>  	int (*power_on)(struct generic_pm_domain *domain);
> -	int (*start_device)(struct device *dev);
> -	int (*stop_device)(struct device *dev);
> -	bool (*active_wakeup)(struct device *dev);
> +	struct gpd_dev_ops dev_ops;

Wouldn't it be better to merge patches 1 and 2?

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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