netdev - Re: [PATCH v2 2/2] can: netlink: add interface for CAN-FD Transmitter Delay Compensation (TDC)

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Message-ID: <20210618093424.xohvsqaaq5qf2bjn@pengutronix.de>
Date:   Fri, 18 Jun 2021 11:34:24 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Oliver Hartkopp <socketcan@...tkopp.net>
Subject: Re: [PATCH v2 2/2] can: netlink: add interface for CAN-FD
 Transmitter Delay Compensation (TDC)

On 04.06.2021 00:15:50, Vincent Mailhol wrote:
> Add the netlink interface for TDC parameters of struct can_tdc_const
> and can_tdc.
> 
> Contrary to the can_bittiming(_const) structures for which there is
> just a single IFLA_CAN(_DATA)_BITTMING(_CONST) entry per structure,
> here, we create a nested entry IFLA_CAN_TDC. Within this nested entry,
> additional IFLA_CAN_TDC_TDC* entries are added for each of the TDC
> parameters of the newly introduced struct can_tdc_const and struct
> can_tdc.
> 
> For struct can_tdc_const, these are:
>         IFLA_CAN_TDC_TDCV_MAX
>         IFLA_CAN_TDC_TDCO_MAX
>         IFLA_CAN_TDC_TDCF_MAX
> 
> For struct can_tdc, these are:
>         IFLA_CAN_TDC_TDCV
>         IFLA_CAN_TDC_TDCO
>         IFLA_CAN_TDC_TDCF

I just noticed in the mcp2518fd data sheet:

| bit 14-8 TDCO[6:0]: Transmitter Delay Compensation Offset bits;
| Secondary Sample Point (SSP) Two’s complement; offset can be positive,
| zero, or negative.
| 
| 011 1111 = 63 x TSYSCLK
| ...
| 000 0000 = 0 x TSYSCLK
| ...
| 111 1111 = –64 x TSYSCLK

Have you takes this into account?

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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