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Date:   Mon, 18 Jul 2022 10:33:12 +0200
From:   Marc Kleine-Budde <>
To:     Matej Vasilevski <>
Cc:     Appana Durga Kedareswara rao <>,
        Naga Sureshkumar Relli <>,
        Wolfgang Grandegger <>,,,
        Martin Jerabek <>
Subject: Re: [PATCH] can: xilinx_can: add support for RX timestamps on Zynq

On 16.07.2022 14:04:09, Matej Vasilevski wrote:
> This patch adds support for hardware RX timestamps from Xilinx Zynq CAN
> controllers. The timestamp is calculated against a timepoint reference
> stored when the first CAN message is received.
> When CAN bus traffic does not contain long idle pauses (so that
> the clocks would drift by a multiple of the counter rollover time),
> then the hardware timestamps provide precise relative time between
> received messages. This can be used e.g. for latency testing.

Please make use of the existing cyclecounter/timecounter framework. Is
there a way to read the current time from a register? If so, please
setup a worker that does that regularly.

Have a look at the mcp251xfd driver as an example:


Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   |  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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