From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anand Moon Subject: Re: [RFC PATCH 01/15] PM / devfreq: exynos: Add generic exynos bus frequency driver Date: Wed, 9 Dec 2015 09:49:41 +0530 Message-ID: References: <1448545659-32287-1-git-send-email-cw00.choi@samsung.com> <1448545659-32287-2-git-send-email-cw00.choi@samsung.com> <5657A4F8.4080003@samsung.com> <5667A9FA.8090802@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <5667A9FA.8090802@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org To: Chanwoo Choi Cc: MyungJoo Ham , Kyungmin Park , Kukjin Kim , =?UTF-8?Q?Krzysztof_Koz=C5=82owski?= , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Russell King , Tobias Jakobi , LKML , Linux PM list , Linux Samsung SoC , devicetree List-Id: devicetree@vger.kernel.org Hi Chanwoo, On 9 December 2015 at 09:41, Chanwoo Choi wrote= : > Hi Anand, > > On 2015=EB=85=84 11=EC=9B=94 27=EC=9D=BC 09:34, Chanwoo Choi wrote: >> Hi Anand, >> >> On 2015=EB=85=84 11=EC=9B=94 27=EC=9D=BC 02:17, Anand Moon wrote: >>> Hi Chanwoo, >>> >>> On 26 November 2015 at 21:42, Chanwoo Choi wro= te: >>>> On Thu, Nov 26, 2015 at 11:00 PM, MyungJoo Ham wrote: >>>>> On Thu, Nov 26, 2015 at 10:47 PM, Chanwoo Choi 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 Exy= nos SoCs. >>>>>> >>>>>> In devicetree, Each bus block has a bus clock, regulator, operat= ion-point >>>>>> and devfreq-event devices which measure the utilization of each = bus block. >>>>>> >>>>>> Signed-off-by: Chanwoo Choi >>>>>> --- >>>>>> 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 su= pport? >>>>> (can this replace both Exynos4/5 drivers and support Exynos7 seri= es?) >>>> >>>> Yes. >>>> This patch-set would support all Exynos SoCs for bus frequency dri= ver. >>>> To make sure the support for Exynos7 series, I need to check the T= RM >>>> 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. >> >> Sure. I'll to test it on Exynos5422-based Odroid-XU3. > > I send the v2 patchset but this patchset don't include > the support of Odroid-XU3 because of only Exynos542x has the > special addtional sequence to change the source clock > of DRAM. So, I'm going to support the bus frequency on Exynos542x. > After completing it, I'll send the separate patches. > > Thanks, > Chanwoo Choi > Not an issue. Thanks for the update. -Anand Moon