linux-kernel - Re: [PATCH 3/5] ARM: davinci: da8xx: add cfgchip2 to resources

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Date:	Wed, 16 Mar 2016 20:38:30 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	David Lechner <david@...hnology.com>, Sekhar Nori <nsekhar@...com>,
	Kevin Hilman <khilman@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>, Bin Liu <b-liu@...com>,
	Petr Kulhavy <petr@...ix.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH 3/5] ARM: davinci: da8xx: add cfgchip2 to resources

On 03/16/2016 07:57 AM, David Lechner wrote:

>>>     No, this register is shared b/w MUSB and OHCI. The proper thing to
>>> do is to write the PHY driver and let it control this shared register.
>>>
>> OK. I've started working on this. I am looking at using struct usb_phy,
>> however, enum usb_phy_type only has USB_PHY_TYPE_UNDEFINED,
>> USB_PHY_TYPE_USB2, and USB_PHY_TYPE_USB3. Would it be acceptable to use
>> USB_PHY_TYPE_UNDEFINED for the ohci since it is USB 1.1? Or perhaps I
>> should use the more generic struct phy for that one?
>>
> Also, I am not finding any existing data structure to pass the musb set_mode
> function to the phy in either usb_phy or usb_otg. Setting the mode
> (host/peripheral/otg) is done in the same PHY register, so it seems like it
> should be implemented in the new phy driver as well.

    Perhaps we'd have to sacrifice that functionality...

> I guess I could use a generic phy instead and use phy_set_drvdata() to share
> data between the phy driver and the musb driver. Does this sound like a
> reasonable thing to do?

    Not sure what you mean, could you elaborate?

MBR, Sergei