Re: [PATCH] clk: sunxi-ng: sun6i-a31: Force AHB1 clock to use PLL6 as parent

[Chen-Yu Tsai]

On Tue, Oct 18, 2016 at 3:50 PM, Jean-Francois Moine <moinejf@xxxxxxx> wrote:
> On Tue, 18 Oct 2016 13:42:09 +0800
> Chen-Yu Tsai <wens@xxxxxxxx> wrote:
>
>> On the A31, the DMA engine only works if AHB1 is clocked from PLL6.
>> In addition, the hstimer is clocked from AHB1, and if AHB1 is clocked
>> from the CPU clock, and cpufreq is working, we get an unstable timer.
>>
>> Force the AHB1 clock to use PLL6 as its parent. Previously this was done
>> in the device tree with the assigned-clocks and assigned-clocks-parent
>> bindings. However with this new monolithic driver, the system critical
>> clocks aren't exported through the device tree. The alternative is to
>> force this setting in the driver before the clocks are registered.
>
> It should be simpler to export the constant (CLK_AHB1) instead of
> adding code...

I get you. But the plan is to not export system core clocks that
don't have a direct user.

ChenYu