linux-kernel - Re: [RFC PATCH] drivers: phy: add generic PHY framework

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Date:	Mon, 17 Sep 2012 11:19:53 +0530
From:	"ABRAHAM, KISHON VIJAY" <kishon@...com>
To:	Chen Peter-B29397 <B29397@...escale.com>
Cc:	"balbi@...com" <balbi@...com>, "arnd@...db.de" <arnd@...db.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Zhao Richard-B20223 <B20223@...escale.com>,
	"alexander.shishkin@...ux.intel.com" 
	<alexander.shishkin@...ux.intel.com>,
	"mkl@...gutronix.de" <mkl@...gutronix.de>,
	"marex@...x.de" <marex@...x.de>
Subject: Re: [RFC PATCH] drivers: phy: add generic PHY framework

Hi,

On Mon, Sep 17, 2012 at 6:50 AM, Chen Peter-B29397 <B29397@...escale.com> wrote:
>
>>
>> The PHY framework provides a set of API's for the PHY drivers to
>> create/remove a PHY and the PHY users to obtain a reference to the PHY
>> using or without using phandle. If the PHY users has to obtain a
>> reference to
>> the PHY without using phandle, the platform specfic intialization code
>> (say
>> from board file) should have already called phy_bind with the binding
>> information. The binding information consists of phy's device name, phy
>> user device name and an index. The index is used when the same phy user
>> binds to mulitple phys.
>>
>
> What's an example of "the same phy user binds to multiple phys"?

Single controller using multiple phys..
> I only remembered that Felipe said there are two phy users for one single phy at
> omap5 that is both usb3 and sata uses the same phy.

*index* is used when a single controller uses multiple phys. For
example it could be used for dwc3 (usb3 controller) where it uses usb2
phy and usb3 phy.

Thanks
Kishon
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