linux-kernel - Re: [PATCH 11/19] clk: samsung: exynos5433: Add clocks for CMU

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Message-id: <547715B2.3070508@samsung.com>
Date:	Thu, 27 Nov 2014 21:14:42 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org, kgene.kim@...sung.com,
	mark.rutland@....com, olof@...om.net, catalin.marinas@....com,
	will.deacon@....com, tomasz.figa@...il.com,
	thomas.abraham@...aro.org, linus.walleij@...aro.org,
	kyungmin.park@...sung.com, inki.dae@...sung.com,
	chanho61.park@...sung.com, geunsik.lim@...sung.com,
	sw0312.kim@...sung.com, jh80.chung@...sung.com,
	a.kesavan@...sung.com, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 11/19] clk: samsung: exynos5433: Add clocks for
 CMU_BUS{0|1|2} domains

Hi Sylwester,

On 11/27/2014 09:12 PM, Sylwester Nawrocki wrote:
> Hi,
> 
> On 27/11/14 12:56, Chanwoo Choi wrote:
>> On 11/27/2014 08:41 PM, Arnd Bergmann wrote:
>>>> On Thursday 27 November 2014 16:35:08 Chanwoo Choi wrote:
>>>>>> +  - "samsung,exynos5433-cmu-bus0", "samsung,exynos5433-cmu-bus1"
>>>>>> +    and "samsung,exynos5433-cmu-bus2" - clock controller compatible for CMU_BUS
>>>>>> +    which generates global data buses clock and global peripheral buses clock.
>>>>>>  
>>>>>>  - reg: physical base address of the controller and length of memory mapped
>>>>>>    region.
>>>>>>
>>>>
>>>> This looks like you are duplicating the bindings and the code, but
>>>> it's really the same hardware multiple times with minor variations
>>>> that you should be able to describe properly here. Why not make
>>>> three nodes with the same compatible string and have them handled
>>>> by the same code?
>>
>> Each CMU_BUSx domain of Exynos5433 have different base address as following:
>> - CMU_BUS0's base address and range : 0x1360_0000 ~ 0x1360_0b04
>> - CMU_BUS1's base address and range : 0x1480_0000 ~ 0x1480_0b04
>> - CMU_BUS2's base address and range : 0x1340_0000 ~ 0x1340_0b04
>>
>> So, I implement CMU_BUSx domain which has each compatible string.
> 
> You can always have multiple entries in the reg property. I've done
> something like this for the exynos4415 CMU_ISPx units:
> 
> 	cmu_isp: clock-controller@...60000 {
> 		compatible = "samsung,exynos4415-cmu-isp";
> 		reg = <0x12060000 0xB10>, <0x12070000 0xB10>;
> 		#clock-cells = <1>;
> 
> 		assigned-clocks = <&cmu CLK_FOUT_ISP_PLL>;
> 		assigned-clock-rates = <300000000>;
> 	};

Thanks for your guide.

I'll re-implment CMU_BUSx domain according to your guide.

Best Regards,
Chanwoo Choi

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