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

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Message-id: <54771518.1010004@samsung.com>
Date:	Thu, 27 Nov 2014 13:12:08 +0100
From:	Sylwester Nawrocki <s.nawrocki@...sung.com>
To:	Chanwoo Choi <cw00.choi@...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,

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>;
	};

--
Regards,
Sylwester
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