linux-kernel - Re: [RFC PATCH 0/5] PTP: add support for Intel's TGPIO controller

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Message-ID: <87h87isci5.fsf@linux.intel.com>
Date:   Fri, 19 Jul 2019 10:35:14 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        "Christopher S . Hall" <christopher.s.hall@...el.com>
Subject: Re: [RFC PATCH 0/5] PTP: add support for Intel's TGPIO controller


Hi,

Andrew Lunn <andrew@...n.ch> writes:
> On Tue, Jul 16, 2019 at 10:20:33AM +0300, Felipe Balbi wrote:
>> TGPIO is a new IP which allows for time synchronization between systems
>> without any other means of synchronization such as PTP or NTP. The
>> driver is implemented as part of the PTP framework since its features
>> covered most of what this controller can do.
>
> Hi Felipe
>
> Given the name TGPIO, can it also be used for plain old boring GPIO?

not really, no. This is a misnomer, IMHO :-) We can only assert output
pulses at specified intervals or capture a timestamp of an external
signal.

> Does there need to be some sort of mux between GPIO and TGPIO? And an
> interface into the generic GPIO core?

no

> Also, is this always embedded into a SoC? Or could it actually be in a
> discrete NIC?

Technically, this could be done as a discrete, but it isn't. In any
case, why does that matter? From a linux-point of view, we have a device
driver either way.

-- 
balbi

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