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Subject: Re: [PATCH v3 5/7] can: dev: add a helper function to calculate the
 duration of one bit
From:   Marc Kleine-Budde <mkl@pengutronix.de>
To:     Vincent Mailhol <mailhol.vincent@wanadoo.fr>,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        linux-can@vger.kernel.org, Wolfgang Grandegger <wg@grandegger.com>,
        "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
Cc:     Oliver Neukum <oneukum@suse.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Arunachalam Santhanam <arunachalam.santhanam@in.bosch.com>,
        "open list:USB ACM DRIVER" <linux-usb@vger.kernel.org>
References: <20201002154219.4887-1-mailhol.vincent@wanadoo.fr>
 <20201002154219.4887-6-mailhol.vincent@wanadoo.fr>
 <49660a42-9465-a519-6dd4-0f80795b0aca@pengutronix.de>
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Message-ID: <b061ed85-582e-50f6-9e7f-da54ed913837@pengutronix.de>
Date:   Sun, 4 Oct 2020 13:10:47 +0200
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From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Vincent Mailhol <mailhol.vincent@wanadoo.fr>,
 linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
 linux-can@vger.kernel.org, Wolfgang Grandegger <wg@grandegger.com>,
 "David S . Miller" <davem@davemloft.net>, Jakub Kicinski <kuba@kernel.org>
Cc: Oliver Neukum <oneukum@suse.com>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
 Masahiro Yamada <masahiroy@kernel.org>,
 Arunachalam Santhanam <arunachalam.santhanam@in.bosch.com>,
 "open list:USB ACM DRIVER" <linux-usb@vger.kernel.org>
Message-ID: <b061ed85-582e-50f6-9e7f-da54ed913837@pengutronix.de>
Subject: Re: [PATCH v3 5/7] can: dev: add a helper function to calculate the
 duration of one bit
References: <20201002154219.4887-1-mailhol.vincent@wanadoo.fr>
 <20201002154219.4887-6-mailhol.vincent@wanadoo.fr>
 <49660a42-9465-a519-6dd4-0f80795b0aca@pengutronix.de>
In-Reply-To: <49660a42-9465-a519-6dd4-0f80795b0aca@pengutronix.de>

--CVh1Q0BrKYAPkqENWGjuEhi8a9asKIYgh
Content-Type: text/plain; charset=utf-8
Content-Language: de-DE
Content-Transfer-Encoding: quoted-printable

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@wanadoo.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
>>  };
>> =20
>> +#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)
>=20
> make it return an unsigned int
> make the bt pointer const

I'll change this while applying the patch.

Marc

--=20
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |


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