[PATCH 2/5] clk: samsung: exynos4415: Add clocks using common clock framework

Chanwoo Choi cw00.choi at samsung.com
Fri Oct 24 06:36:19 PDT 2014

Hi Daniel,

On 10/24/2014 10:18 PM, Daniel Drake wrote:
> On Sun, Oct 19, 2014 at 9:32 PM, Chanwoo Choi <cw00.choi at samsung.com> wrote:
>> This patch adds the new clock driver of Exynos4415 SoC based on Cortex-A9
>> using common clock framework. The CMU (Clock Management Unit) of Exynos4415
>> controls PLLs(Phase Locked Loops) and generates system clocks for CPU, buses
>> and function clocks for individual IPs.
> There seems to be a lot in common here with other exynos4 variants in
> clk-exynos4.c. Have you considered just adding support for the 4415 in
> the existing driver?

Yes, It is difficult and to make existing clk-exynos4.c more complicated.
Exynos4415 has fewer difference from existing clk-exynos4.c and
different parent source of mux.

For exmaple about PLL,
There are different PLLs between Exynos4412 and Exynos4415.
- Exynos4412 has APLL, MPLL, EPLL, VPLL.
- Exynos4415 has APLL, EPLL, G3D_PLL, ISP_PLL, DISP_PLL and MPLL.
Also, MPLL of Exynos4415 was included in CMU_DMC scope.

Best Regards,
Chanwoo Choi

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