How to add more panel power on sequence control gpios into panel device node of device-tree?

[SS_S]

Hello,

I'm using a iMX8MP with a custom board and Android11.

LVDS display and logo output well when I added enable-gpios<...> property into panel device node of device-tree.

But the corresponding probe function of driver (panel-simple.c) won't be invoked after I added more one reset-gpios<...> property into panel device node of device-tree.

May you comment how to add more panel power on sequence control GPIOs into panel device node of device-tree?

Thanks in advanced.

[joanxie]

could you share your new dts file with me? let me double check it, and what power on sequence control GPIOs do you mean? what is your use case?

[SS_S]

for newer DTS

Dear joanxie,

My project panel has more gpios to control its power on/off sequence. (VDD,RESET,TP_EN and BL) 

Currently, the panel power on sequence doesn't meet above specification.

So, we need to define those gpios (VDD,RESET,TP_EN and BL) to fine tune them.

Now, the panel output and work well when I have enable-gpios<...> property in lvds_panel device node for VDD and another enable-gpios<...> property in ss_backlight device node for BL.

but it will fail after I add reset-gpio<...> property into lvds_panel dvice node. (the probe function of driver panel-simple.c won't be invoked.)

Please refer to attchment for the DTS. (my tag is "ss_panel")

Thanks

[joanxie]

pls share your schematic about this gpio connection let me double confirm this

[SS_S · Accepted solution]

Dear Joanxie,

I found its cause this morning and try to debug it.

Thanks for your kindly reply.