# keyboard-base-probe 2026-10-13T19:34:33Z
# kernel 7.3.0-rc5

## pin muxing (pinctrl debugfs)
pin 2 (IO2): device 91403000.serial function nrf9151-en-pins group nrf9151-en-cfg
pin 28 (IO28): device 91403000.serial function uart3-nrf-pins group uart3-txd-cfg
pin 29 (IO29): device 91403000.serial function uart3-nrf-pins group uart3-rxd-cfg
pin 42 (IO42): UNCLAIMED
pin 43 (IO43): UNCLAIMED
pin 46 (IO46): device 91409000.i2c function i2c4-pins group i2c4-scl-cfg
pin 47 (IO47): device 91409000.i2c function i2c4-pins group i2c4-sda-cfg
pin 50 (IO50): device 91403000.serial function uart3-nrf-pins group uart3-io50-io51-release-cfg
pin 51 (IO51): device 91403000.serial function uart3-nrf-pins group uart3-io50-io51-release-cfg
pin 52 (IO52): UNCLAIMED

## GPIO state (gpio debugfs; IO42 = gpio1 10, IO43 = gpio1 11)
(no requested line among IO42/43/46/47/52)
IO42/IO43 are unrequested lines when absent above; their levels are
not sampled here so that the reset line is never reconfigured.

## i2cdetect -y -r 1 (hardware I2C4, IO46 SCL / IO47 SDA)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: 20 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- 34 -- -- -- 38 -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- 55 -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- 6b -- -- -- -- 
70: -- -- -- -- -- -- -- --                         

## BQ25896 charger 0x6b, registers 0x00-0x14 except 0x0c
0x6b reg 0x00 = 0x7f
0x6b reg 0x01 = 0x06
0x6b reg 0x02 = 0x11
0x6b reg 0x03 = 0x1a
0x6b reg 0x04 = 0x0b
0x6b reg 0x05 = 0x13
0x6b reg 0x06 = 0x72
0x6b reg 0x07 = 0x8d
0x6b reg 0x08 = 0x03
0x6b reg 0x09 = 0x44
0x6b reg 0x0a = 0x73
0x6b reg 0x0b = 0x5e
0x6b reg 0x0d = 0x12
0x6b reg 0x0e = 0x63
0x6b reg 0x0f = 0x64
0x6b reg 0x10 = 0x3e
0x6b reg 0x11 = 0x97
0x6b reg 0x12 = 0x05
0x6b reg 0x13 = 0x12
0x6b reg 0x14 = 0x06

## BQ27220 gauge 0x55, standard commands 0x06-0x3c (words)
0x55 cmd 0x06 = 0x0c0b
0x55 cmd 0x08 = 0x106a
0x55 cmd 0x0a = 0x5268
0x55 cmd 0x0c = 0x0000
0x55 cmd 0x0e = 0xffff
0x55 cmd 0x10 = 0x0bb8
0x55 cmd 0x12 = 0x0bb8
0x55 cmd 0x14 = 0x0000
0x55 cmd 0x16 = 0xffff
0x55 cmd 0x18 = 0xffff
0x55 cmd 0x1a = 0xfff6
0x55 cmd 0x1c = 0x4650
0x55 cmd 0x1e = 0xfc18
0x55 cmd 0x20 = 0x00b4
0x55 cmd 0x22 = 0xffb7
0x55 cmd 0x24 = 0x0000
0x55 cmd 0x26 = 0xffff
0x55 cmd 0x28 = 0x0c0b
0x55 cmd 0x2a = 0x0000
0x55 cmd 0x2c = 0x0064
0x55 cmd 0x2e = 0x0064
0x55 cmd 0x30 = 0x1068
0x55 cmd 0x32 = 0x0000
0x55 cmd 0x34 = 0x0096
0x55 cmd 0x36 = 0x00af
0x55 cmd 0x38 = 0xffff
0x55 cmd 0x3a = 0x00a4
0x55 cmd 0x3c = 0x0bb8

## TCA8418 keypad 0x34: CFG 0x01, INT_STAT 0x02, KEY_LCK_EC 0x03
0x34 reg 0x01 = 0x29
0x34 reg 0x02 = 0x00
0x34 reg 0x03 = 0x00

## XL9555 expander 0x20: input 0-1, output 2-3, polarity 4-5, config 6-7
0x20 reg 0x00 = 0xff
0x20 reg 0x01 = 0xff
0x20 reg 0x02 = 0xff
0x20 reg 0x03 = 0xff
0x20 reg 0x04 = 0x00
0x20 reg 0x05 = 0x00
0x20 reg 0x06 = 0xc7
0x20 reg 0x07 = 0xff

## DRV2605 haptics 0x5a
0x5a does not answer: DRV2605 not fitted

## other answering addresses
0x38 is expected to be the AHT20 humidity sensor (not read)
# end