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

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Date:	Wed, 16 Mar 2016 21:22:14 +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 09:14 PM, David Lechner wrote:

>>> 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...
>
> The device I am working on (LEGO MINDSTORMS EV3) has the port wired as
> peripheral only, so I don't think leaving this out is an option. Leaving it in
> OTG mode doesn't work because the required electrical connections are just not
> there.

    The set_mode() method doesn't have anything to do with the predefined 
roles. What CFGCHIP2 setting do is to override the ID input (and also the VBUS 
level comparator). This is not required for the normal functioning of either 
host or peripheral AFAIR.

[...]

MBR, Sergei