linux-kernel - Re: [PATCH v2 1/3] ARM: dts: berlin2q: add the Marvell Armada 1500 pro

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Date:	Fri, 14 Mar 2014 12:36:44 +0100
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>, zmxu@...vell.com,
	jszhang@...vell.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] ARM: dts: berlin2q: add the Marvell Armada 1500
 pro

On 03/14/2014 12:32 PM, Alexandre Belloni wrote:
> On 14/03/2014 at 10:31:55 +0100, Sebastian Hesselbarth wrote :
>> On 03/13/2014 03:06 PM, Antoine Ténart wrote:
>>> +		local-timer@...600 {
>>> +			compatible = "arm,cortex-a9-twd-timer";
>>> +			reg = <0xad0600 0x20>;
>>> +			clocks = <&sysclk>;
>>
>> If I understand Jisheng correctly, this should be cpuclk/3. When
>> removing the clocks {} container above, please also take care of
>> it.
>>
>
> You understood correctly
>
>> You can do
>>
>> cpuclk: cpu-clock {
>> 	compatible = "fixed-clock";
>> 	#clock-cells = <0>;
>> 	clock-frequency = <1200000000>; /* <- put correct freq here */
>> };
>>
>> sysclk: system-clock {
>> 	compatible = "fixed-factor-clock";
>> 	#clock-cells = <0>;
>> 	clocks = <&cpuclk>;
>> 	clock-multi = <1>;
>> 	clock-div = <3>;
>> };
>>
>> Hopefully, we'll have proper clock drivers soon so we can just replace
>> referenced "fixed-*" clocks.
>>
>
> I'm working on that, do you have some code that you can share right now ?

No, nothing specific. You can have a look at drivers/clk/mvebu/ and see
how we deal with it on mvebu. For now, you can stick with bg2q and I'll
see how we extend that drivers for bg2/bg2cd then.

BTW: We really enjoy having a mvebu subfolder in drivers/clk as it makes
things easier. If you prepare any clk drivers for berlin, I'd suggest to
put them in drivers/clk/berlin from the beginning.

Sebastian

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