Hi David,
On Thu, Jul 30, 2015 at 3:10 AM, David Jander <david@xxxxxxxxxxx> wrote:
> Thanks for testing.
> Just to be sure, from reading Chapter 63.3.2.1 of the i.MX6Q reference manual,
> I understand that peripheral clock is needed for accessing registers, while ipg
> clock ("module clock") is used for shift registers and state-machine. AFAICS,
> enabling peripheral clock should be enough for resetting the UART. Do you agree
I have "i.MX 6Dual/6Quad Applications Processor Reference Manual, Rev.
2, 06/2014" version.
Table 64-6 shows the UART Clocks.
Clock name Clock Root Description
ipg_clk ipg_clk_root Peripheral clock
ipg_clk_s ipg_clk_root Peripheral access clock
ipg_perclk uart_clk_root Module clock
For register access I would expect that we only need ipg_clk turned on.
Not sure why your patch works by turning on ipg_perclk instead.
Regards,
Fabio Estevam
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