[PATCH net-next v2 2/3] net: ethernet: ti: am65-cpts: add pps support

[Roger Quadros]

On 16/01/2023 10:55, Siddharth Vadapalli wrote:
> From: Grygorii Strashko <grygorii.strashko at ti.com>
> 
> CPTS doesn't have HW support for PPS ("pulse per second”) signal
> generation, but it can be modeled by using Time Sync Router and routing
> GenFx (periodic signal generator) output to CPTS_HWy_TS_PUSH (hardware time
> stamp) input, and configuring GenFx to generate 1sec pulses.
> 
>      +------------------------+
>      |          CPTS          |
>      |                        |
>  +--->CPTS_HW4_PUSH      GENFx+---+
>  |   |                        |   |
>  |   +------------------------+   |
>  |                                |
>  +--------------------------------+
> 
> Add corresponding support to am65-cpts driver. The DT property "ti,pps"
> has to be used to enable PPS support and configure pair
> [CPTS_HWy_TS_PUSH, GenFx].
> 
> Once enabled, PPS can be tested using ppstest tool:
>  # ./ppstest /dev/pps0
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko at ti.com>
> Signed-off-by: Siddharth Vadapalli <s-vadapalli at ti.com>

Reviewed-by: Roger Quadros <rogerq at kernel.org>