From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arun Parameswaran Subject: Re: [PATCH v1 1/2] dt-binding: ptp: add bindings document for dte based ptp clock Date: Wed, 14 Jun 2017 11:39:17 -0700 Message-ID: References: <1497299161-6458-1-git-send-email-arun.parameswaran@broadcom.com> <1497299161-6458-2-git-send-email-arun.parameswaran@broadcom.com> <20170613050947.GA1684@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Content-Language: en-US Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Ray Jui , Richard Cochran Cc: Rob Herring , Mark Rutland , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, bcm-kernel-feedback-list-dY08KVG/lbpWk0Htik3J/w@public.gmane.org List-Id: devicetree@vger.kernel.org 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@180af650 { >>>> + 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 driver, in 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 >> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html