linux-kernel - Re: [PATCH v1 0/6] USB: Add support for multiple PHYs of same type

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Date:	Tue, 22 Jan 2013 18:02:56 +0100
From:	Koen Kooi <koen@...inion.thruhere.net>
To:	kishon <kishon@...com>
Cc:	<tony@...mide.com>, <balbi@...com>, <linux@....linux.org.uk>,
	<eballetbo@...il.com>, <javier@...hile0.org>,
	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-omap@...r.kernel.org List" <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>,
	Jason Kridner <jkridner@...gleboard.org>
Subject: Re: [PATCH v1 0/6] USB: Add support for multiple PHYs of same type


Op 22 jan. 2013, om 17:16 heeft kishon <kishon@...com> het volgende geschreven:

> Hi,
> 
> On Tuesday 22 January 2013 09:15 PM, kishon wrote:
>> On Tuesday 22 January 2013 09:11 PM, Koen Kooi wrote:
>>> 
>>> Op 22 jan. 2013, om 10:58 heeft Kishon Vijay Abraham I <kishon@...com>
>>> het volgende geschreven:
>>> 
>>>> This patch series adds support for adding multiple PHY's (of same type).
>>>> The binding information has to be present in the PHY library (otg.c) in
>>>> order for it to return the appropriate PHY whenever the USB controller
>>>> request for the PHY. So added a new API usb_bind_phy() to pass the
>>>> binding
>>>> information. This API should be called by platform specific
>>>> initialization
>>>> code.
>>>> 
>>>> So the binding should be done something like
>>>> usb_bind_phy("musb-hdrc.0.auto", 0, "omap-usb2.1.auto"); specifying
>>>> the USB
>>>> controller device name, index, and the PHY device name.
>>>> I have done this binding for OMAP platforms, but it should be done for
>>>> all the platforms.
>>>> 
>>>> After this design, the phy can be got by passing the USB controller
>>>> device
>>>> pointer and the index.
>>>> 
>>>> Developed this patch series on
>>>> git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git xceiv
>>>> after applying "usb: musb: add driver for control module" patch series
>>>> and "ARM: dts: omap: add dt data for MUSB"
>>>> 
>>>> Did basic enumeration testing in omap4 panda and omap3 beagle.
>>> 
>>> With this patchset USB completely breaks on am33xx beaglebone, is that
>>> intended?
>> Not really.
>> Does am33xx makes use of omap2430.c? Which PHY does am33xx uses?
> 
> I figured out it uses drivers/usb/musb/musb_dsps.c (So it doesn't use omap2430.c). I think it uses TWL4030_USB (TPS659x0) as PHY.

Actually it uses nop-phy as a phy, which is missing from arch/arm/boot/dts/am33xx.dtsi, so mainline is already broken. But adding the nop-phy to the DT is easy enough to patch in locally.

regards,

Koen--
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