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

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Message-ID: <CANAwSgQtvp_7hODvLz--5QmXMYqhOQYyBjihyRqWYv5HEk0u5A@mail.gmail.com>
Date:	Thu, 26 Nov 2015 22:47:19 +0530
From:	Anand Moon <linux.amoon@...il.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	MyungJoo Ham <myungjoo.ham@...il.com>,
	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>,
	Tobias Jakobi <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

Hi Chanwoo,

On 26 November 2015 at 21:42, Chanwoo Choi <cwchoi00@...il.com> wrote:
> 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

Please do consider Exynos 542x series as well.

-Anand Moon
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