From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tero Kristo Subject: Re: [PATCH 2/2] ARM: omap5/dra7xx: Fix counter frequency drift for AM572x errata i856. Date: Wed, 17 Dec 2014 17:56:40 +0200 Message-ID: <5491A7B8.7000804@ti.com> References: <358281a880ccd89873efeea75edaa6c953eac2bd.1418421100.git.lsorense@csclub.uwaterloo.ca> <20141214044517.GD24110@csclub.uwaterloo.ca> <549018EC.8020207@ti.com> <20141216145856.GA23358@kahuna> <54918357.8060801@ti.com> <20141217145533.GS24110@csclub.uwaterloo.ca> <20141217152225.GA737@kahuna> <20141217152710.GT24110@csclub.uwaterloo.ca> <5491A501.100@ti.com> <20141217155359.GA26990@kahuna> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20141217155359.GA26990@kahuna> Sender: linux-kernel-owner@vger.kernel.org To: Nishanth Menon Cc: Lennart Sorensen , Lokesh Vutla , linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sekhar Nori List-Id: linux-omap@vger.kernel.org On 12/17/2014 05:53 PM, Nishanth Menon wrote: > On 17:45-20141217, Tero Kristo wrote: >> On 12/17/2014 05:27 PM, Lennart Sorensen wrote: >>> On Wed, Dec 17, 2014 at 09:22:25AM -0600, Nishanth Menon wrote: >>>> A clock mux might do the job? >>>> >>>> value 1, 2 , 3 will imply sysclk1 / 610 >>>> value of 0 implies fixed 32768 >>>> >>>> soemthing like >>>> sys_clk32_crystal { >>>> compatible = "fixed-clock"; >>>> clock-frequency = <32768>; >>>> } >>>> >>>> sys_clk32_pseudo { >>>> compatible = "fixed-clock"; >>>> compatible = "fixed-factor-clock"; >>>> clocks = <&sys_clkin1>; >>>> clock-mult = <1>; >>>> clock-div = <610>; >>>> } >>>> >>>> sys_32k_ck: sys_32k_ck { >>>> compatible = "ti,mux-clock"; >>>> clocks = <&sys_clk32_crystal>, <&sys_clk32_pseudo>, <&sys_clk32_pseudo>, <&sys_clk32_pseudo>; >>>> }; >>>> >>>> I think... The only issue is that the BOOTSTRAP register is not around >>>> the usual CM1,2 address region... >>> >>> OK, I like where that idea is headed. That looks promising. >>> >> >> Yea clock mux can be used. However, we don't have support for DRA7 >> control module clocks in the DT yet. I have posted patches with >> support towards this a couple of weeks back, but they need some >> revising. >> >> Thus, we maybe need to apply the timer patches as is for now, and >> fix the clock tree a bit later. > > Sounds good to me, could you propose a patch in list? Yea, I can add a patch for this to the PRCM cleanup set once I get to update that. -Tero