Re: [PATCH 2/2] ARM: dts: imx6ul: Add imx6ul-tempmon

[Fabio Estevam]

On Fri, Jun 9, 2017 at 7:58 AM, Leonard Crestez <leonard.crestez@xxxxxxx> wrote:

> Yes, as far as I can tell the tempmon block uses the 480 Mhz PLL3 clock
> directly. This is similar to other imx6 SOCs. This PLL is used for
> stuff like USB but not only that. My understanding is the _USB_OTG
> suffix is descriptive, similar to PLL4_AUDIO and PLL6_ENET. Other non-
> usb components use PLL3 (like UART) but through other gates/dividers.

Yes, PLL3 can be a parent for the UART clock, but UART has its own clock gate.

> Setting this to IMX6UL_CLK_DUMMY will cause temperature reads to fail.
> Even if PLL3 usually ends up being constantly enabled because of uarts
> this is not true at imx_thermal_probe time (or uarts can be disabled).

Ok, thanks for confirming. It was not obvious from reading the
reference manual that the PLL3 clock is the gate for tempmon.