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Date:   Wed, 30 Mar 2022 09:54:22 +0200
From:   Marc Kleine-Budde <>
To:     Ondrej Ille <>
Cc:     Pavel Pisa <>,,,
        Oliver Hartkopp <>,
        Wolfgang Grandegger <>,
        David Miller <>,
        Rob Herring <>,,
        Carsten Emde <>,,,,
        Marin Jerabek <>,
        Jiri Novak <>,
        Jaroslav Beran <>,
        Petr Porazil <>, Pavel Machek <>,
        Drew Fustini <>
Subject: Re: [PATCH v8 0/7] CTU CAN FD open-source IP core SocketCAN driver,
 PCI, platform integration and documentation

On 30.03.2022 09:46:08, Ondrej Ille wrote:
> sorry for the late reply, my work duties are keeping me very busy.

Known problem :)

> Let me just quickly comment on topics discussed in the emails above.
> *1. Separation of PROP and TSEG1*
> IMHO there is no real benefit. The reason why CTU CAN FD has this
> split is legacy. First implementation back in 2015 had this split
> since I wanted to follow the standard. In HW, the first thing done in
> bit timing logic (prescaler module), these two numbers are added, and
> all further resynchronization/hard-synchronization is done with TSEG1
> value...

Thanks for the insight. It's not easy to get in touch with the
developers of the proprietary IP cores :)

Never the less, there's another IP core which has different sizes for
the prop and tseg1 register. So an update of the bit timing constant
would help both.

> *2. Number of TXT Buffers and RX Buffer size:*
> Pavel already replied with TXTB_INFO. The same role has the RX_MEM_INFO
> register, when it comes to RX side.

Thanks for the clarification.


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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