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

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Date:	Fri, 24 Oct 2014 22:36:19 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Daniel Drake <drake@...lessm.com>
Cc:	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Kukjin Kim <kgene.kim@...sung.com>, ben-linux@...ff.org,
	Russell King <linux@....linux.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Mike Turquette <mturquette@...aro.org>,
	thomas.abraham@...aro.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	InKi Dae <inki.dae@...sung.com>, geunsik.lim@...sung.com,
	jh80.chung@...sung.com, jaewon02.kim@...sung.com,
	ideal.song@...sung.com, yj44.cho@...sung.com,
	Sylwester Nawrocki <s.nawrocki@...sung.com>
Subject: Re: [PATCH 2/5] clk: samsung: exynos4415: Add clocks using common
 clock framework

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@...sung.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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