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iMX7D power reduction methods in suspend mode

Question asked by Benson Young on Jul 3, 2019
Latest reply on Aug 18, 2019 by Benson Young

Hello,

 

Our product will be battery powered under certain operating condition.

In order to conserve power, I will be bringing the processor into suspend mode with command

echo mem > /sys/power/state

I noticed some GPIO is brought to a different state. Is it defined in the iomuxc_lpsr structure within the DTS?

&iomuxc_lpsr {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lte_psm>;

...

}

Is there any way that I can define/control GPIO behaviour during processor suspend mode, so I can reduce possible DC leakage current.

 

If I have unused functionality like MIPI, HDMI, SPI etc. Is it possible for me to shut them down? using DTS? or dynamically?

 

thank you

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