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

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Message-ID: <4E40EC14.1010005@pengutronix.de>
Date:	Tue, 09 Aug 2011 10:13:08 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	U Bhaskar-B22300 <B22300@...escale.com>
CC:	Wolfgang Grandegger <wg@...ndegger.com>,
	"socketcan-core@...ts.berlios.de" <socketcan-core@...ts.berlios.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC 5/5] [powerpc] Implement a p1010rdb clock source.

On 08/09/2011 09:57 AM, U Bhaskar-B22300 wrote:
>> On 08/08/2011 05:33 PM, Wolfgang Grandegger wrote:
>>>> ACK - The device tree bindings as in mainline's Documentation is a
>> mess.
>>>> If the powerpc guys are happy with a clock interfaces based approach
>>>> somewhere in arch/ppc, I'm more than happy to remove:
>>>> - fsl,flexcan-clock-source (not implemented, even in the fsl driver)

> [Bhaskar]I have pushed the FlexCAN series of patches, It contains the
> usage of all the fields posted in the FlexCAN bindings at 
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-3.0.y.git;a=blob;f=Documentation/devicetree/bindings/net/can/fsl-flexcan.txt;h=1a729f089866259ef82d0db5893ff7a8c54d5ccf;hb=94ed5b4788a7cdbe68bc7cb8516972cbebdc8274

I've commented the patches. They are in a very bad shape. Please test
Robin's patches.

>>>>
>>>> - fsl,flexcan-clock-divider \__ replace with code in arch/ppc, or
>>>> - clock-frequency           /   a single clock-frequency attribute
>>>
>>> In the "net-next-2.6" tree there is also:
>>>
>>>  $ grep flexcan arch/powerpc/boots/dts/*.dts
>>>   p1010rdb.dts:			fsl,flexcan-clock-source = "platform";
>>>   p1010rdb.dts:			fsl,flexcan-clock-source = "platform";
>>>   p1010si.dtsi:			compatible = "fsl,flexcan-v1.0";
>>>   p1010si.dtsi:			fsl,flexcan-clock-divider = <2>;
>>>   p1010si.dtsi:			compatible = "fsl,flexcan-v1.0";
>>>   p1010si.dtsi:			fsl,flexcan-clock-divider = <2>;
>>>
>>> Especially the fsl,flexcan-clock-divider = <2>; might make people
>>> think, that they could set something else.
>>
> [Bhaskar] As it is mentioned in the Flexcan bindings, the need of
> fsl,flexcan-clock-divider = <2>; But I kept it as "2" because FlexCan
> clock source is the platform clock and it is CCB/2 If the "2" is
> misleading, the bindings can be changed or some text can be written
> to make the meaning of "2" Understandable , Please suggest ..

The clock devider is crap. Why not specify the clockrate that goes into
the flexcan core?

cheers, Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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