linux-kernel - Re: [PATCH v2 01/10] usb: phy: Add APIs for runtime power management

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Date:	Mon, 4 Mar 2013 17:29:20 +0200
From:	Felipe Balbi <balbi@...com>
To:	Vivek Gautam <gautam.vivek@...sung.com>
CC:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
	<gregkh@...uxfoundation.org>, <balbi@...com>,
	<sarah.a.sharp@...ux.intel.com>, <kgene.kim@...sung.com>,
	<kishon@...com>
Subject: Re: [PATCH v2 01/10] usb: phy: Add APIs for runtime power management

Hi,

On Sat, Mar 02, 2013 at 06:53:02PM +0530, Vivek Gautam wrote:
> Adding  APIs to handle runtime power management on PHY
> devices. PHY consumers may need to wake-up/suspend PHYs
> when they work across autosuspend.
> 
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> ---
>  include/linux/usb/phy.h |   26 ++++++++++++++++++++++++++
>  1 files changed, 26 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
> index 15847cb..0fe7cac 100644
> --- a/include/linux/usb/phy.h
> +++ b/include/linux/usb/phy.h
> @@ -276,4 +276,30 @@ static inline const char *usb_phy_type_string(enum usb_phy_type type)
>  		return "UNKNOWN PHY TYPE";
>  	}
>  }
> +
> +#define USB_PHY_AUTOPM(function)					    \
> +static inline int usb_phy_autopm_##function(struct usb_phy *x)		    \
> +{									    \
> +	if (!x || !x->dev) {						    \
> +		dev_err(x->dev, "no PHY or attached device available\n");   \
> +		return -ENODEV;						    \
> +	}								    \
> +									    \
> +	pm_runtime_##function(x->dev);					    \

please make the definitions explicit (not using a macro) and use:

	return pm_runtime_foo();

where applicable. We don't want to return 0 if pm_runtime_get_sync()
fails.

-- 
balbi

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