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Bloody DTB and Function Button.....

GPIO Pin Test Matrix for FN Button in play_joystick (RK3326 Clone - G80CA-MB V1.2)

We are testing by appending a 19th entry to key-gpios and setting gpio-key-num = <0x13>.

Bank	Pin (dec)	Pin (hex)	Full Entry	Tested?	Result
gpio2	9	0x09	<0x66 0x09 0x01>	Yes	No (no event)
gpio2	26	0x1a	<0x66 0x1a 0x01>	Yes	No (no event)
gpio2	8	0x08	<0x66 0x08 0x01>	Yes	No (no event)
gpio2	27	0x1b	<0x66 0x1b 0x01>	Yes	Failed to boot (after logo)
gpio2	6	0x06	<0x66 0x06 0x01>	Yes	No (no event)
gpio3	12	0x0c	<0x6e 0x0c 0x01>	Yes	No (no event)
gpio3	15	0x0f	<0x6e 0x0f 0x01>	Yes	No (no event)
gpio3	11	0x0b	<0x6e 0x0b 0x01>	Yes	Failed to boot (after logo)

Summary of Results

• Successful boot but no FN event: 6 tests (gpio2-9,26,8,6; gpio3-12,15)
• Boot failure: 2 tests (gpio2-27, gpio3-11) → indicates kernel/driver rejection (possible out-of-range or conflict)