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

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Message-ID: <56E9A584.9040609@cogentembedded.com>
Date:	Wed, 16 Mar 2016 21:27:16 +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 09:22 PM, Sergei Shtylyov 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.

   Or at least it wasn't when I last looked. Now it does... :-/

> [...]

MBR, Sergei