netdev - Re: [PATCH v3 5/7] can: dev: add a helper function to calculate the duration of one bit

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Message-ID: <b061ed85-582e-50f6-9e7f-da54ed913837@pengutronix.de>
Date:   Sun, 4 Oct 2020 13:10:47 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-can@...r.kernel.org, Wolfgang Grandegger <wg@...ndegger.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Arunachalam Santhanam <arunachalam.santhanam@...bosch.com>,
        "open list:USB ACM DRIVER" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v3 5/7] can: dev: add a helper function to calculate the
 duration of one bit

On 10/4/20 1:06 PM, Marc Kleine-Budde wrote:
> On 10/2/20 5:41 PM, Vincent Mailhol wrote:
>> Rename macro CAN_CALC_SYNC_SEG to CAN_SYNC_SEG and make it available
>> through include/linux/can/dev.h
>>
>> Add an helper function can_bit_time() which returns the duration (in
>> time quanta) of one CAN bit.
>>
>> Rationale for this patch: the sync segment and the bit time are two
>> concepts which are defined in the CAN ISO standard. Device drivers for
>> CAN might need those.
>>
>> Please refer to ISO 11898-1:2015, section 11.3.1.1 "Bit time" for
>> additional information.
>>
>> Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>

[...]

>> index 791c452d98e1..77c3ea49b8fb 100644
>> --- a/include/linux/can/dev.h
>> +++ b/include/linux/can/dev.h
>> @@ -82,6 +82,21 @@ struct can_priv {
>>  #endif
>>  };
>>  
>> +#define CAN_SYNC_SEG 1
>> +
>> +/*
>> + * can_bit_time() - Duration of one bit
>> + *
>> + * Please refer to ISO 11898-1:2015, section 11.3.1.1 "Bit time" for
>> + * additional information.
>> + *
>> + * Return: the number of time quanta in one bit.
>> + */
>> +static inline int can_bit_time(struct can_bittiming *bt)
> 
> make it return an unsigned int
> make the bt pointer const

I'll change this while applying the patch.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
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