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

[Vadim Fedorenko]

On 02/07/2025 16:17, Parvathi Pudi wrote:
> From: Roger Quadros <rogerq at ti.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 at ti.com>
> Signed-off-by: Andrew F. Davis <afd at ti.com>
> Signed-off-by: Basharath Hussain Khaja <basharath at couthit.com>
> Signed-off-by: Parvathi Pudi <parvathi at couthit.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 at linux.dev>