netdev - Re: [RFC 5/5] [powerpc] Implement a p1010rdb clock source.

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Date:	Mon, 08 Aug 2011 16:37:44 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Robin Holt <holt@....com>
CC:	socketcan-core@...ts.berlios.de,
	U Bhaskar-B22300 <B22300@...escale.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>, netdev@...r.kernel.org
Subject: Re: [RFC 5/5] [powerpc] Implement a p1010rdb clock source.

On 08/08/2011 04:21 PM, Robin Holt wrote:
> On Mon, Aug 08, 2011 at 04:16:27PM +0200, Wolfgang Grandegger wrote:
>> On 08/08/2011 03:56 PM, Robin Holt wrote:
>>>> commit 65bb8b060a873fa4f5188f2951081f6011259614
>>>> Author: Bhaskar Upadhaya <Bhaskar.Upadhaya@...escale.com>
>>>> Date:   Fri Mar 4 20:27:58 2011 +0530
>>>
>>> On a side note, that commit fixes up "fsl,flexcan-v1.0"
>>> ...
>>> +       do_fixup_by_compat_u32(blob, "fsl,flexcan-v1.0",
>>> +                       "clock_freq", gd->bus_clk, 1);
>>>
>>> Should I go back to flexcan-v1.0 in my patches?
>>
>> Well, no. Let's wait. I don't think we need it. Also, it sets
>> "clock_freq" while
>>
>>  http://lxr.linux.no/#linux+v3.0.1/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
>>
>> documents "clock-frequencies"... :-(.
> 
> You answered a different question that I was asking.  I was asking if
> I should change fsl,flexcan back to fsl,flexcan-v1.0 as documented on
> line 5.  The clock_freq looks like a uboot change will need to be made
> as well.

Well, I wrote above: "Well, no. Let's wait. I don't think we need it."

For the P1010 we can sinmply derive the clock frequency from
"fsl_get_sys_freq()", which is fine for the time being. No extra
properties, etc. The clk implemetation might go into

 http://lxr.linux.no/#linux+v3.0.1/arch/powerpc/platforms/85xx/clock.c

or

 http://lxr.linux.no/#linux+v3.0.1/arch/powerpc/sysdev/fsl_soc.c

And may depend on HAVE_CAN_FLEXCAN

BTW, I have not found HAVE_CAN_FLEXCAN in your patch. What kernel are
you using?

Wolfgang.

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