linux-kernel - Re: [RFC][PATCH] bcmai: introduce AI driver

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Message-ID: <BANLkTimy8LEqBqeJQD5SY=e8ZgEy8pRVHw@mail.gmail.com>
Date:	Fri, 8 Apr 2011 19:27:11 +0200
From:	Rafał Miłecki <zajec5@...il.com>
To:	Arend van Spriel <arend@...adcom.com>
Cc:	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"John W. Linville" <linville@...driver.com>,
	Michael Büsch <mb@...sch.de>,
	Larry Finger <Larry.Finger@...inger.net>,
	George Kashperko <george@...u.edu.ua>,
	"b43-dev@...ts.infradead.org" <b43-dev@...ts.infradead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <rmk@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	linuxdriverproject <devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] bcmai: introduce AI driver

2011/4/8 Arend van Spriel <arend@...adcom.com>:
> On Fri, 08 Apr 2011 18:56:13 +0200, Rafał Miłecki <zajec5@...il.com> wrote:
>
>> 2011/4/6 Arend van Spriel <arend@...adcom.com>:
>>>
>>> 3. Device identification
>>>
>>> The cores are identified by manufacturer, core id and revision in your
>>> patch. I would not use the revision because 4 out of 5 times a revision
>>> change does indicate a hardware change but no change in programming
>>> interface. The enumeration data does contain a more selective field
>>> indicating the core class (4 bits following the core identifier). I
>>> suggest
>>> to replace the revision field by this class field.
>>
>> Could you say something more about *class*, please? For my BCM43224 it
>> seems to be 0x0. WIll check BCM4313 in a moment.
>>
>
> In principal the manufacturer id is unique (defined/assigned by JEDEC
> www.jedec.org) and the chip id and chip class are defined by the
> manufacturer. So I can only indicate what classes Broadcom uses in
> combination with the manufacturer id BRCM, ARM and MIPS.
>
> /* Component Classes */
> #define CC_SIM                  0
> #define CC_EROM                 1
> #define CC_CORESIGHT            9
> #define CC_VERIF                0xb
> #define CC_OPTIMO               0xd
> #define CC_GEN                  0xe
> #define CC_PRIMECELL            0xf
>
> Looking at this it seems strange that you see a class value of 0x0. It may
> be rarely used or for non-production chips only (for simulation, chip
> bringup) which may require additional (debug) functions. So question is
> whether you will need it, but it is specified by ARM and it is up to
> manufacturers to use it. So I it is better to be safe than sorry and have
> this in the device id.

OK, thanks. I'm compiling kernel with patch V2 right now. Of course
class included.

-- 
Rafał
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