Re: [PATCH 2/2] ARM: omap5/dra7xx: Fix counter frequency drift for AM572x errata i856.

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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

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