Re: [PATCH 11/19] clk: samsung: exynos5433: Add clocks for CMU_BUS{0|1|2} domains

[Sylwester Nawrocki <s.nawrocki@samsung.com>]

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@12060000 {
		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