linux-kernel - Re: [PATCH v7] can, tty: can327 CAN/ldisc driver for ELM327 based OBD-II adapters

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Date:   Sat, 11 Jun 2022 15:16:49 +0200
From:   Max Staudt <max@...as.org>
To:     Vincent Mailhol <vincent.mailhol@...il.com>
Cc:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-can@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oliver Neukum <oneukum@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7] can, tty: can327 CAN/ldisc driver for ELM327 based
 OBD-II adapters

On Sat, 4 Jun 2022 00:47:10 +0900
Vincent Mailhol <vincent.mailhol@...il.com> wrote:

> > > +#define ELM327_CAN_CONFIG_SEND_SFF           0x8000
> > > +#define ELM327_CAN_CONFIG_VARIABLE_DLC       0x4000
> > > +#define ELM327_CAN_CONFIG_RECV_BOTH_SFF_EFF  0x2000
> > > +#define ELM327_CAN_CONFIG_BAUDRATE_MULT_8_7  0x1000  
> 
> This ELM327_CAN_CONFIG_BAUDRATE_MULT_8_7 macro is not used.

True. It does document a flag in the ELM327 configuration registers
though, and it was originally meant for adding 7/8 bitrates (e.g. 87500
as a companion to 100000). I never got around to implementing those
bitrates, though.

I find opportunistic documentation helpful for future reference and
to give casual readers hints - can I leave it in there anyway, or is it
deemed an eyesore?

Max