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Date: Wed, 17 Dec 2014 09:53:59 -0600 From: Nishanth Menon <nm@...com> To: Tero Kristo <t-kristo@...com> CC: Lennart Sorensen <lsorense@...lub.uwaterloo.ca>, Lokesh Vutla <lokeshvutla@...com>, <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, Sekhar Nori <nsekhar@...com> Subject: Re: [PATCH 2/2] ARM: omap5/dra7xx: Fix counter frequency drift for AM572x errata i856. 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? -- Regards, Nishanth Menon -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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