netdev - Re: [Socketcan-users] [PATCH net-next v2 1/4] can: cc770: add driver core for the Bosch CC770 and Intel AN82527

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Message-ID: <4ED3966E.7080609@grandegger.com>
Date:	Mon, 28 Nov 2011 15:10:54 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
CC:	netdev@...r.kernel.org, socketcan-users@...ts.berlios.de,
	linux-can@...r.kernel.org
Subject: Re: [Socketcan-users] [PATCH net-next v2 1/4] can: cc770: add driver
 core for the Bosch CC770 and Intel AN82527

On 11/28/2011 03:01 PM, Marc Kleine-Budde wrote:
> On 11/28/2011 02:52 PM, Wolfgang Grandegger wrote:
> 
> [...]
> 
>>>> +/*
>>>> + * This driver uses the last 5 message objects 11..15. The definitions
>>>> + * and structure below allows to configure and assign them to the real
>>>> + * message object.
>>>> + */
>>>> +static unsigned char cc770_obj_flags[CC770_OBJ_MAX] = {
>>>> +	[CC770_OBJ_RX0] = CC770_OBJ_FLAG_RX,
>>>> +	[CC770_OBJ_RX1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_EFF,
>>>> +	[CC770_OBJ_RX_RTR0] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR,
>>>> +	[CC770_OBJ_RX_RTR1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR |
>>>> +			      CC770_OBJ_FLAG_EFF,
>>>> +	[CC770_OBJ_TX] = 0,
>>>> +};
>>>
>>> Is is worth the trouble making this a per device instance option? In a
>>> OF-Tree world should this become an "attribute" (or what's the correct
>>> of-tree word for it?)
>>
>> Well, only msg object 15 does have double buffering and should therefore
>> be used for bulk data reception. Therefore we have for the i82527 the
>> module parameter:
>>
>>   MODULE_PARM_DESC(msgobj15_eff,
>> 	           "Extended 29-bit frames for message object 15 "
>> 	 	   "(default: 11-bit standard frames)");
>>
>> For TX we currently use just one object. Anyway, the device tree is not
>> the right place to define such parameters because it's too static. The
>> user may want to select it at runtime depending on the application, if
>> at all. We can change it when there is a *real* requirement.
> 
> Fine with me.
> 
>>>> +	for (o = 0; o <  CC770_OBJ_MAX; o++) {
>>>                          ^^^^^^^^^^^^^
>>>
>>> what about ARRAY_SIZE(priv->obj_flags)
>>
>> CC770_OBJ_MAX is not derived from a static array definition but as show
>> below:
> 
> Okay...
> 
>>   enum {
>> 	CC770_OBJ_RX0 = 0,	/* for receiving normal messages */
>> 	CC770_OBJ_RX1,		/* for receiving normal messages */
>> 	CC770_OBJ_RX_RTR0,	/* for receiving remote transmission requests */
>> 	CC770_OBJ_RX_RTR1,	/* for receiving remote transmission requests */
>> 	CC770_OBJ_TX,		/* for sending messages */
>> 	CC770_OBJ_MAX  <================
> 
> ...then add a "," here :P

Why?

Wolfgang.
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