linux-kernel - Re: [PATCH 0/5] Add phy support for AM335X platform using Generic PHy framework

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Message-ID: <20130710052343.GA15674@arwen.pp.htv.fi>
Date:	Wed, 10 Jul 2013 08:23:43 +0300
From:	Felipe Balbi <balbi@...com>
To:	George Cherian <george.cherian@...com>
CC:	Kishon Vijay Abraham I <kishon@...com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	<linux-usb@...r.kernel.org>, <balbi@...com>,
	<linux-kernel@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH 0/5] Add phy support for AM335X platform using Generic
 PHy framework

On Wed, Jul 10, 2013 at 10:26:25AM +0530, George Cherian wrote:
> On 7/9/2013 5:05 PM, Kishon Vijay Abraham I wrote:
> >Hi,
> >
> >On Tuesday 09 July 2013 11:10 AM, George Cherian wrote:
> >>On 7/9/2013 1:14 AM, Sebastian Andrzej Siewior wrote:
> >>>On 07/08/2013 12:43 PM, George Cherian wrote:
> >>>>This patch series adds phy support for AM335X platform.
> >>>>This patch series is based on Generic PHY framework [1].
> >>>>
> >>>>
> >>>>This series has
> >>>>     - adds dual musb instances support for am335x platform (just for testing)
> >>>>     - adds phy-amxxxx-usb driver used in AMxxxx platforms
> >>>>     - adds dt  bindings for the phys
> >>>>     - removes usb-phy and replaced with generic phy apis in glue layer
> >>>No, I don't like this all. You did the one thing I tried to avoid while
> >>>posting my quick-and-dirty phy driver recently: You duplicated a lot of
> >>>code which can be served by the nop driver and added only power
> >>>on/power off callbacks.
> >>I wanted to add phy wakeup control also, but currently phy_ops  dont have an op
> >>for wkup_ctrl
> >>Kishon, Can we add one?
> >Since this should be a capability of the PHY, can't we have wkup_ctrl always
> >enabled if the PHY has such a capability?
> 
> No, we cant have wakeup always enabled. Normally we enable it only
> when we go to low power states and
> if the user needs USB a wakeup source.
> 
> So how about enable/disable  phy wakeup from phy suspend/resume?

you should use something like so on your ->suspend() or
->runtime_suspend() method

static int my_phy_{suspend,runtime_suspend}(struct device *dev)
{
	struct my_phy *phy = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		my_phy_enable_wakeup(phy);

	return 0;
}

> >or if it needs more user control,
> >should we implement a sysfs entry to enable wakeup?

that already exists ;-)

-- 
balbi

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