linux-kernel - Re: [PATCH v2 1/1] can: ucan: add driver for Theobroma Systems UCAN devices

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Date:   Tue, 13 Mar 2018 18:44:02 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Jakob Unterwurzacher <jakob.unterwurzacher@...obroma-systems.com>
Cc:     Martin Elshuber <martin.elshuber@...obroma-systems.com>,
        Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] can: ucan: add driver for Theobroma Systems UCAN
 devices

On 03/13/2018 06:35 PM, Jakob Unterwurzacher wrote:

[...]

Please mark all multibyte values going over the USB as either le or be.

> +struct ucan_ctl_cmd_start {
> +	u16 mode;            /* oring any of UCAN_MODE_* */
> +} __packed;
> +
> +struct ucan_ctl_cmd_set_bittiming {
> +	u32 tq;		     /* Time quanta (TQ) in nanoseconds */
> +	u16 brp;	     /* TQ Prescaler */
> +	u16 sample_point;    /* Samplepoint on tenth percent */
> +	u8 prop_seg;	     /* Propagation segment in TQs */
> +	u8 phase_seg1;	     /* Phase buffer segment 1 in TQs */
> +	u8 phase_seg2;	     /* Phase buffer segment 2 in TQs */
> +	u8 sjw;		     /* Synchronisation jump width in TQs */
> +} __packed;
> +
> +struct ucan_ctl_cmd_device_info {
> +	u32 freq;   /* Clock Frequency for tq generation */
> +	u8 tx_fifo; /* Size of the transmission fifo */
> +	u8 sjw_max;   /* can_bittiming fields... */
> +	u8 tseg1_min;
> +	u8 tseg1_max;
> +	u8 tseg2_min;
> +	u8 tseg2_max;
> +	u16 brp_inc;
> +	u32 brp_min;
> +	u32 brp_max; /* ...can_bittiming fields */
> +	u16 ctrlmodes; /* supported control modes */
> +	u16 hwfilter;  /* Number of HW filter banks */
> +	u16 rxmboxes;  /* Number of receive Mailboxes */
> +} __packed;
> +
> +struct ucan_ctl_cmd_get_protocol_version {
> +	u32 version;
> +} __packed;
> +
> +union ucan_ctl_payload {
> +	/***************************************************
> +	 * Setup Bittiming
> +	 * bmRequest == UCAN_COMMAND_START
> +	 ***************************************************/

Please use standard 'net' comment style:

/* this is a multiline
 * comment
 */

> +	struct ucan_ctl_cmd_start cmd_start;
> +	/***************************************************
> +	 * Setup Bittiming
> +	 * bmRequest == UCAN_COMMAND_SET_BITTIMING
> +	 ***************************************************/
> +	struct ucan_ctl_cmd_set_bittiming cmd_set_bittiming;
> +	/***************************************************
> +	 * Get Device Information
> +	 * bmRequest == UCAN_COMMAND_GET; wValue = UCAN_COMMAND_GET_INFO
> +	 ***************************************************/
> +	struct ucan_ctl_cmd_device_info cmd_get_device_info;
> +	/***************************************************
> +	 * Get Protocol Version
> +	 * bmRequest == UCAN_COMMAND_GET;
> +	 * wValue = UCAN_COMMAND_GET_PROTOCOL_VERSION
> +	 ***************************************************/
> +	struct ucan_ctl_cmd_get_protocol_version cmd_get_protocol_version;
> +
> +	u8 raw[128];
> +} __packed;

Marc

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



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