How to send dsi command via sys device node

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How to send dsi command via sys device node

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boyiliao
Contributor I

Hi,

I would like to send DSI commands to sys device node

For example in other platform 
we can send the commands below to get 
echo 0x01 0x06 0x01 0x00 0x01 0x00 0x00 0x01 0xDA > /d/dri/0/DSI-1/rx_cmd
cat /d/dri/0/dri/0/DSI-1/rx_cmd

In iMX8 iMX9 platform, where is the rootfs device node ?

BR,
Patrick

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