linux-kernel - Re: [PATCH v3 01/11] usb: phy: Add APIs for runtime power management

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Date:	Wed, 3 Apr 2013 10:38:33 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Vivek Gautam <gautam.vivek@...sung.com>, <balbi@...com>
CC:	<linux-usb@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<gregkh@...uxfoundation.org>, <stern@...land.harvard.edu>,
	<sarah.a.sharp@...ux.intel.com>, <rob.herring@...xeda.com>,
	<kgene.kim@...sung.com>, <dianders@...omium.org>,
	<t.figa@...sung.com>, <p.paneri@...sung.com>
Subject: Re: [PATCH v3 01/11] usb: phy: Add APIs for runtime power management

Hi,

On Monday 01 April 2013 07:24 PM, 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 |  141 +++++++++++++++++++++++++++++++++++++++++++++++
>   1 files changed, 141 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
> index 6b5978f..01bf9c1 100644
> --- a/include/linux/usb/phy.h
> +++ b/include/linux/usb/phy.h
> @@ -297,4 +297,145 @@ static inline const char *usb_phy_type_string(enum usb_phy_type type)
>   		return "UNKNOWN PHY TYPE";
>   	}
>   }
> +
> +static inline void usb_phy_autopm_enable(struct usb_phy *x)
> +{
> +	if (!x || !x->dev) {
> +		dev_err(x->dev, "no PHY or attached device available\n");
> +		return;
> +		}
> +
> +	pm_runtime_enable(x->dev);
> +}

IMO we need not have wrapper APIs for runtime_enable and runtime_disable 
here. Generally runtime_enable and runtime_disable is done in probe and 
remove of a driver respectively. So it's better to leave the 
runtime_enable/runtime_disable to be done in *phy provider* driver than 
having an API for it to be done by *phy user* driver. Felipe, what do 
you think?

Thanks
Kishon
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