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

From: Chanwoo Choi <cwchoi00@gmail.com>
To: MyungJoo Ham <myungjoo.ham@gmail.com>
Cc: "Kyungmin Park" <kyungmin.park@samsung.com>,
	"Kukjin Kim" <kgene@kernel.org>,
	"Krzysztof Kozłowski" <k.kozlowski@samsung.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Pawel Moll" <pawel.moll@arm.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Ian Campbell" <ijc+devicetree@hellion.org.uk>,
	"Kumar Gala" <galak@codeaurora.org>,
	"Russell King" <linux@arm.linux.org.uk>,
	tjakobi@math.uni-bielefeld.de,
	LKML <linux-kernel@vger.kernel.org>,
	"Linux PM list" <linux-pm@vger.kernel.org>,
	"Linux Samsung SoC" <linux-samsung-soc@vger.kernel.org>,
	devicetree <devicetree@vger.kernel.org>
Subject: Re: [RFC PATCH 01/15] PM / devfreq: exynos: Add generic exynos bus frequency driver
Date: Fri, 27 Nov 2015 01:12:50 +0900	[thread overview]
Message-ID: <CAGTfZH295rGWh4S0mPgC7GMiA04NKgDybRUVnfzZP5o9-HffMw@mail.gmail.com> (raw)
In-Reply-To: <CAJ0PZbSJ26q9MWSXihQjZih0hSU=w+dR2HKxa67kJhmZtt1tJQ@mail.gmail.com>

On Thu, Nov 26, 2015 at 11:00 PM, MyungJoo Ham <myungjoo.ham@samsung.com> wrote:
> On Thu, Nov 26, 2015 at 10:47 PM, Chanwoo Choi <cw00.choi@samsung.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@samsung.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