linux-kernel - Re: [RFC PATCH 01/15] PM / devfreq: exynos: Add generic exynos bus frequency driver

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Date:	Fri, 27 Nov 2015 01:12:50 +0900
From:	Chanwoo Choi <cwchoi00@...il.com>
To:	MyungJoo Ham <myungjoo.ham@...il.com>
Cc:	Kyungmin Park <kyungmin.park@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozłowski <k.kozlowski@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	tjakobi@...h.uni-bielefeld.de, LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Samsung SoC <linux-samsung-soc@...r.kernel.org>,
	devicetree <devicetree@...r.kernel.org>
Subject: Re: [RFC PATCH 01/15] PM / devfreq: exynos: Add generic exynos bus
 frequency driver

On Thu, Nov 26, 2015 at 11:00 PM, MyungJoo Ham <myungjoo.ham@...sung.com> wrote:
> On Thu, Nov 26, 2015 at 10:47 PM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>> This patch adds the generic exynos bus frequency driver for AMBA AXI bus
>> of sub-blocks in exynos SoC with DEVFREQ framework. The Samsung Exynos SoC
>> have the common architecture for bus between DRAM and sub-blocks in SoC.
>> This driver can support the generic bus frequency driver for Exynos SoCs.
>>
>> In devicetree, Each bus block has a bus clock, regulator, operation-point
>> and devfreq-event devices which measure the utilization of each bus block.
>>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> ---
>>  drivers/devfreq/Kconfig             |  15 ++
>>  drivers/devfreq/Makefile            |   1 +
>>  drivers/devfreq/exynos/Makefile     |   1 +
>>  drivers/devfreq/exynos/exynos-bus.c | 443 ++++++++++++++++++++++++++++++++++++
>>  4 files changed, 460 insertions(+)
>>  create mode 100644 drivers/devfreq/exynos/exynos-bus.c
>>
>
> Are we finally getting a common Exynos bus driver with full DT support?
> (can this replace both Exynos4/5 drivers and support Exynos7 series?)

Yes.
This patch-set would support all Exynos SoCs for bus frequency driver.
To make sure the support for Exynos7 series, I need to check the TRM
document of Exynos7.  I think it is possible for support Exynos7.

I'm going to test this driver on various Exynos-based board.

Regards,
Chanwoo Choi
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