linux-kernel - Re: [PATCH 2/2] misc: Add initial Digital Timing Engine (DTE) driver for cygnus

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Message-ID: <555E1A70.90305@broadcom.com>
Date:	Thu, 21 May 2015 10:48:32 -0700
From:	Jonathan Richardson <jonathar@...adcom.com>
To:	Richard Cochran <richardcochran@...il.com>
CC:	Arnd Bergmann <arnd@...db.de>,
	Darren Edamura <dedamura@...adcom.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Scott Branden <sbranden@...adcom.com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Ray Jui <rjui@...adcom.com>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	<bcm-kernel-feedback-list@...adcom.com>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] misc: Add initial Digital Timing Engine (DTE) driver
 for cygnus

On 15-05-20 11:33 PM, Richard Cochran wrote:
> On Wed, May 20, 2015 at 04:38:02PM -0700, Jonathan Richardson wrote:
>>
>> Richard, this design isn't going to work. We need to have both kernel
>> and user space consumers.
> 
> But you did not implement even a single kernel consumer.
> 
>> We don't want all GPIO's in a common timestamp
>> buffer either, as it presents problems I mentioned previously. Currently
>> the network input is a gpio.
> 
> That won't work.  Consider what happens when the MAC drops a packet.
> 
>> After some discussion here I think we'll
>> have to keep this driver out of the kernel for now.
> 
> Fine with me.

We'll keep this discussion and try to figure out the best interface
keeping in mind what you've said as we move further along with it. Not a
wasted discussion. Requirements of this need to be better defined and
thought out also.

Thanks,
Jon

> 
> Thanks,
> Richard
> 

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