netdev - Re: [PATCH v1 1/2] dt-binding: ptp: add bindings document for dte based ptp clock

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Message-ID: <55054c58-b493-7225-4aec-84f9e1c6e022@broadcom.com>
Date:   Wed, 14 Jun 2017 11:33:25 -0700
From:   Arun Parameswaran <arun.parameswaran@...adcom.com>
To:     Ray Jui <ray.jui@...adcom.com>,
        Richard Cochran <richardcochran@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH v1 1/2] dt-binding: ptp: add bindings document for dte
 based ptp clock



On 17-06-14 11:18 AM, Ray Jui wrote:
> 
> 
> On 6/13/17 10:46 AM, Arun Parameswaran wrote:
>>
>> Hi Richard,
>>
>> On 17-06-12 10:09 PM, Richard Cochran wrote:
>>> On Mon, Jun 12, 2017 at 01:26:00PM -0700, Arun Parameswaran wrote:
>>>> +Example:
>>>> +
>>>> +ptp_dte: ptp_dte@...af650 {
>>>> +	compatible = "brcm,ptp-dte";
>>>> +	reg = <0x180af650 0x10>;
>>>> +	status = "okay";
>>>> +};
>>> This patch set looks okay, as far as it goes, but how does one
>>> actually use the clock?
>>>
>>> How does one connect this node to an Ethernet MAC, for example?
>> In some of the SoC's, the DTE's NCO is synced in hardware with the Ethernet's
>> 1588 Shim NCO (used for time-stamping the packets). We are working on getting
>> all the future SoC's synced this way (for Ethernet).
>>
> 
> So apparently you do not need any phandle based DT binding defined for
> the connection between the Ethernet device node and the PTP device node?
> 
Correct. This driver doesn't need any phandle.

The Ethernet/Switch driver, in the SoC's where the hardware link is not
available, might need the phandle to this driver.

>> In other scenarios, we use an user-space app to perform the sync based on
>> time-stamps from external hardware sources like the Wi-Fi.
>>> Thanks,
>>> Richard
>>