linux-kernel - Re: [PATCH net-next v10 06/11] net: ti: prueth: Adds HW timestamping support for PTP using PRU-ICSS IEP module

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Message-ID: <218ed5ce-6e0d-41f7-809b-04e554d08c5a@linux.dev>
Date: Thu, 3 Jul 2025 23:52:17 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Parvathi Pudi <parvathi@...thit.com>, danishanwar@...com,
 rogerq@...nel.org, andrew+netdev@...n.ch, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, ssantosh@...nel.org,
 richardcochran@...il.com, s.hauer@...gutronix.de, m-karicheri2@...com,
 glaroque@...libre.com, afd@...com, saikrishnag@...vell.com,
 m-malladi@...com, jacob.e.keller@...el.com, diogo.ivo@...mens.com,
 javier.carrasco.cruz@...il.com, horms@...nel.org, s-anna@...com,
 basharath@...thit.com
Cc: linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, pratheesh@...com,
 prajith@...com, vigneshr@...com, praneeth@...com, srk@...com, rogerq@...com,
 krishna@...thit.com, pmohan@...thit.com, mohan@...thit.com
Subject: Re: [PATCH net-next v10 06/11] net: ti: prueth: Adds HW timestamping
 support for PTP using PRU-ICSS IEP module

On 02/07/2025 16:17, Parvathi Pudi wrote:
> From: Roger Quadros <rogerq@...com>
> 
> PRU-ICSS IEP module, which is capable of timestamping RX and
> TX packets at HW level, is used for time synchronization by PTP4L.
> 
> This change includes interaction between firmware and user space
> application (ptp4l) with required packet timestamps. The driver
> initializes the PRU firmware with appropriate mode and configuration
> flags. Firmware updates local registers with the flags set by driver
> and uses for further operation. RX SOF timestamp comes along with
> packet and firmware will rise interrupt with TX SOF timestamp after
> pushing the packet on to the wire.
> 
> IEP driver is available in upstream and we are reusing for hardware
> configuration for ICSSM as well. On top of that we have extended it
> with the changes for AM57xx SoC.
> 
> Extended ethtool for reading HW timestamping capability of the PRU
> interfaces.
> 
> Currently ordinary clock (OC) configuration has been validated with
> Linux ptp4l.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> Signed-off-by: Andrew F. Davis <afd@...com>
> Signed-off-by: Basharath Hussain Khaja <basharath@...thit.com>
> Signed-off-by: Parvathi Pudi <parvathi@...thit.com>
> ---
>   drivers/net/ethernet/ti/icssg/icss_iep.c      |  42 ++
>   drivers/net/ethernet/ti/icssm/icssm_ethtool.c |  23 +
>   drivers/net/ethernet/ti/icssm/icssm_prueth.c  | 423 +++++++++++++++++-
>   drivers/net/ethernet/ti/icssm/icssm_prueth.h  |  11 +
>   .../net/ethernet/ti/icssm/icssm_prueth_ptp.h  |  85 ++++
>   5 files changed, 582 insertions(+), 2 deletions(-)
>   create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth_ptp.h
> 

Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>