linux-kernel - Re: [PATCH v2 06/11] phy: da8xx-usb: new driver for DA8XX SoC USB PHY

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Date:	Fri, 1 Apr 2016 22:45:47 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	David Lechner <david@...hnology.com>, Bin Liu <b-liu@...com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Petr Kulhavy <petr@...ix.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Sekhar Nori <nsekhar@...com>,
	Kevin Hilman <khilman@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andreas Färber <afaerber@...e.de>,
	Tony Lindgren <tony@...mide.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 06/11] phy: da8xx-usb: new driver for DA8XX SoC USB PHY

On 04/01/2016 07:02 PM, David Lechner wrote:

>>>> +EXPORT_SYMBOL_GPL(da8xx_usb20_phy_set_mode);
>>>
>>> Don't prefer export symbols from PHY driver. That'll create unnecessary
>>> dependencies between the controller and the PHY.
>>
>> Agreed.
>>
>>> I think it'll be better to create a new attribute and use it?
>>
>> Another simpler option is to not support _set_mode() for DA8xx, and the
>> phy driver set the otgmode bit in probe() based on dr_mode of the
>> controller.
>>
>> Regards,
>> -Bin.
>
> This certainly works for my particular use case, however, Sergei Shtylyov, who
> wrote the da8xx musb glue layer originally, seemed to recall in his review of
> the patch series that this really is necessary for OTG mode to work properly.

    No, it's still not necessary, however this method is now called from 
musb_init_controller() (it wasn't in my time). ISTR however that you needed to 
enforce the mode override in CFGCHIP2 for the host mode to function properly.

WBR, Sergei