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Date:	Sun, 21 Oct 2012 20:46:17 +0200
From:	Richard Cochran <>
To:	Mugunthan V N <>
Subject: Re: [PATCH 0/6] Add CPTS PTP driver support

On Wed, Oct 17, 2012 at 04:15:12AM +0530, Mugunthan V N wrote:
> This patch series contains driver implementation for TI Common Platform
> Time Sync (CPTS) driver for PTP packet timestamping.
> CPTS is found in following TI SoC.
> * AM335X -
> * DM814X -
> The Common Platform Time Sync (CPTS) module is used to facilitate host
> control of time sync operations. It enables compliance with the IEEE 1588-2008
> standard for a precision clock synchronization protocol
> This patch series is tested over vanilla kernel with the below patches

I tried v3.7-rc1 plus those patches, plus this patch series, plus the
small addition of this ...

diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
index f6bea04..e0e152b 100644
--- a/arch/arm/boot/dts/am33xx.dtsi
+++ b/arch/arm/boot/dts/am33xx.dtsi
@@ -222,6 +222,7 @@
 			ale_entries = <1024>;
 			host_port_reg_ofs = <0x108>;
 			hw_stats_reg_ofs = <0x900>;
+			cpts_reg_ofs = <0xc00>;
 			bd_ram_ofs = <0x2000>;
 			bd_ram_size = <0x2000>;
 			no_bd_ram = <0>;

... and it doesn't work. 

> Tested both L2 and L4 PTP packet timestamping


With your driver I could not get either L2 or L4 time stamps to
appear. At this point, my own driver is working a lot better, and so
this just adds another reason to favor my driver, in addtion to the
points I mentioned in my other post.

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