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

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Message-ID: <0fdd9e9b-c6ac-b5c3-adb5-01a764a7b8f6@kernel.org>
Date:   Mon, 16 Jan 2023 18:09:05 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     Siddharth Vadapalli <s-vadapalli@...com>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        robh+dt@...nel.org, krzysztof.kozlowski@...aro.org,
        krzysztof.kozlowski+dt@...aro.org, vigneshr@...com, nsekhar@...com
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        srk@...com
Subject: Re: [PATCH net-next v2 2/3] net: ethernet: ti: am65-cpts: add pps
 support



On 16/01/2023 10:55, Siddharth Vadapalli wrote:
> From: Grygorii Strashko <grygorii.strashko@...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@...com>
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>

Reviewed-by: Roger Quadros <rogerq@...nel.org>