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Which peripherals on the IMX6-SDB/SDP need care at warm boot in general?

Question asked by torus1000 on Nov 21, 2017
Latest reply on Nov 26, 2017 by torus1000
Branched to a new discussion

Hi,


For some reasons, several peripheral powers keep alive during mem(state retaintion) mode.
Actually I found following description in the imx6qdl-sabresd.dtsi which expected keep-power.

> &usdhc4 {
> ...
> keep-power-in-suspend;
> status = "okay";
> };

Based on that I tried to shutdown power with modified PMIC driver(pfuz100-regulator.c).
Then I could see SW4 supply stopped when wrote 0x04 to SW4MODE register.
My question for the next step is following:

 

Which peripherals on the i.MX6 Sabre-SD board need special care at warm boot?

 

I guess LCD or LVDS need no initialization.
How about eMMC/SD, NOR, Audio(WM8962), ETHER-PHY or USB?

 

Can anyone help me?

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