20220321在MT6739的android8.1下调试GPIO引脚
2022/3/21 18:40

1、完整编译MT6739的android8.1的SDK：
rootroot@rootroot-desktop:~$ 
rootroot@rootroot-desktop:~$ cd mt6739_android8.1/
rootroot@rootroot-desktop:~/mt6739_android8.1$ 
rootroot@rootroot-desktop:~/mt6739_android8.1$ source build/envsetup.sh 
including device/asus/fugu/vendorsetup.sh
including device/generic/car/vendorsetup.sh
including device/generic/mini-emulator-arm64/vendorsetup.sh
including device/generic/mini-emulator-armv7-a-neon/vendorsetup.sh
including device/generic/mini-emulator-mips64/vendorsetup.sh
including device/generic/mini-emulator-mips/vendorsetup.sh
including device/generic/mini-emulator-x86_64/vendorsetup.sh
including device/generic/mini-emulator-x86/vendorsetup.sh
including device/generic/uml/vendorsetup.sh
including device/google/dragon/vendorsetup.sh
including device/google/marlin/vendorsetup.sh
including device/google/muskie/vendorsetup.sh
including device/google/taimen/vendorsetup.sh
including device/huawei/angler/vendorsetup.sh
including device/lge/bullhead/vendorsetup.sh
including device/linaro/hikey/vendorsetup.sh
including device/mediatek/build/vendorsetup.sh
including device/mediateksample/k39tv1_64_bsp/vendorsetup.sh
including device/mediateksample/k39tv1_bsp_1g/vendorsetup.sh
including device/mediateksample/k39tv1_bsp_512/vendorsetup.sh
including device/mediateksample/k39tv1_bsp/vendorsetup.sh
including sdk/bash_completion/adb.bash
rootroot@rootroot-desktop:~/mt6739_android8.1$ 
rootroot@rootroot-desktop:~/mt6739_android8.1$ lunch

You're building on Linux

Lunch menu... pick a combo:
     1. aosp_arm-eng
     2. aosp_arm64-eng
……
     34. full_k39tv1_64_bsp-user
     35. full_k39tv1_64_bsp-userdebug
     36. full_k39tv1_bsp_1g-eng
     37. full_k39tv1_bsp_1g-user
     38. full_k39tv1_bsp_1g-userdebug
     39. full_k39tv1_bsp_512-eng
     40. full_k39tv1_bsp_512-user
     41. full_k39tv1_bsp_512-userdebug
     42. full_k39tv1_bsp-eng
     43. full_k39tv1_bsp-user
     44. full_k39tv1_bsp-userdebug

Which would you like? [aosp_arm-eng] 36

============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=8.1.0
TARGET_PRODUCT=full_k39tv1_bsp_1g
TARGET_BUILD_VARIANT=eng
TARGET_BUILD_TYPE=release
TARGET_PLATFORM_VERSION=OPM1
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
TARGET_CPU_VARIANT=cortex-a53
TARGET_2ND_ARCH=
TARGET_2ND_ARCH_VARIANT=
TARGET_2ND_CPU_VARIANT=cortex-a53
HOST_ARCH=x86_64
HOST_2ND_ARCH=x86
HOST_OS=linux
HOST_OS_EXTRA=Linux-4.4.0-142-generic-x86_64-with-Ubuntu-14.04-trusty
HOST_CROSS_OS=windows
HOST_CROSS_ARCH=x86
HOST_CROSS_2ND_ARCH=x86_64
HOST_BUILD_TYPE=release
BUILD_ID=O11019
OUT_DIR=out
AUX_OS_VARIANT_LIST=
============================================
rootroot@rootroot-desktop:~/mt6739_android8.1$ 
rootroot@rootroot-desktop:~/mt6739_android8.1$ 
rootroot@rootroot-desktop:~/mt6739_android8.1$ make -j16

2、初步发现，GPIO口可以通过mt_gpio节点配置和读取，但是看/对照原理图（右上角部分）就是不受控制！
心想，LCD屏能够亮，它的RST控制引脚：LCM_RST的GPIO号肯定是对的。于是直接控制GPIO83了。

Z:\n82\kernel-4.14\drivers\misc\mediatek\lcm\ili9806e_fwvga_dsi_vdo_dijin\ili9806e_fwvga_dsi_vdo_dijin.c
#define GPIO_LCM_RST     (83 | 0x80000000) //GPIO83

确认是android8.1：
k39tv1_bsp_1g:/ # 
k39tv1_bsp_1g:/ # cat /proc/version                                            
Linux version 4.4.95 (rootroot@rootroot-desktop) (gcc version 6.3.1 20170404 (Linaro GCC 6.3-2017.05) ) #1 SMP PREEMPT Thu Mar 24 12:01:34 CST 2022
k39tv1_bsp_1g:/ # 
k39tv1_bsp_1g:/ # date
Thu Mar  3 08:42:51 CST 2022
k39tv1_bsp_1g:/ # 
k39tv1_bsp_1g:/ # time
    0m00.11s user     0m00.19s system
k39tv1_bsp_1g:/ # 
k39tv1_bsp_1g:/ # 
k39tv1_bsp_1g:/ # cd /sys/devices/platform/1000b000.pinctrl/   
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # ll
total 0
lrwxrwxrwx 1 root root    0 2022-03-03 08:43 driver -> ../../../bus/platform/drivers/mediatek-pinctrl
-rw-r--r-- 1 root root 4096 2022-03-03 08:43 driver_override
-r--r--r-- 1 root root 4096 2022-03-03 08:43 modalias
-rw-rw-r-- 1 root root 4096 2022-03-03 08:43 mt_gpio
lrwxrwxrwx 1 root root    0 2022-03-03 08:43 of_node -> ../../../firmware/devicetree/base/pinctrl@1000b000
drwxr-xr-x 2 root root    0 2022-03-03 08:43 power
lrwxrwxrwx 1 root root    0 2022-03-03 08:43 subsystem -> ../../../bus/platform
-rw-r--r-- 1 root root 4096 2022-03-03 08:43 uevent
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # cat mt_gpio
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 011111100 01
   1: 000010100 01
   2: 000111100 01

82: 100011100 01
  83: 110110100
  84: 100110100

配置GPIO83为GPIO模式：
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # echo mode 83 0 > mt_gpio
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # cat mt_gpio
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 011111100 01
   1: 000010100 01
   2: 000111100 01

82: 100011100 01
  83: 010010100
  84: 100010100

黑屏了！^_

配置GPIO83为GPIO的输出模式：
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # echo dir 83 1 > mt_gpio
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # cat mt_gpio
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 011111100 01
   1: 000010100 01
   2: 000111100 01
   3: 000010100 01

82: 100011100 01
  83: 010010100
  84: 100010100

配置GPIO83为GPIO的输出高：
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # echo out 83 1 > mt_gpio
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # cat mt_gpio
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 011111100 01
   1: 000010100 01
   2: 000111100 01
   3: 000010100 01

81: 110010100 01
  82: 100011100 01
  83: 011110100
  84: 100010100

配置GPIO83为GPIO的输出低：【确认受控制！】
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # echo out 83 0 > mt_gpio
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # cat mt_gpio
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 011111100 01
   1: 000010100 01
   2: 000111100 01
   3: 000010100 01
   4: 011100100 00

82: 100011100 01
  83: 010010100
  84: 100010100

3、和高手交流，如果GPIO控制不了，需要配置codegen.dws。
因此将右上角的14个GPIO引脚全部配置为高。
rootroot@rootroot-desktop:~/mt6739_android8.1$ 
rootroot@rootroot-desktop:~/mt6739_android8.1$ find . -name codegen.dws
./vendor/mediatek/proprietary/custom/k75v1_64_bsp/kernel/dct/dct/codegen.dws
./vendor/mediatek/proprietary/custom/k39tv1_bsp/kernel/dct/dct/codegen.dws
./vendor/mediatek/proprietary/custom/k39tv1_64_bsp/kernel/dct/dct/codegen.dws
./vendor/mediatek/proprietary/custom/k39tv1_bsp_512/kernel/dct/dct/codegen.dws
./vendor/mediatek/proprietary/custom/k39tv1_bsp_1g/kernel/dct/dct/codegen.dws
./vendor/mediatek/proprietary/custom/k71v1_64_bsp/kernel/dct/dct/codegen.dws
./vendor/mediatek/proprietary/custom/evb6771_64_emmc/kernel/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k75v1_64_bsp/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k39tv1_bsp/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k39tv1_bsp/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k39tv1_64_bsp/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k39tv1_bsp_512/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k39tv1_bsp_512/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k39tv1_bsp_1g/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k39tv1_bsp_1g/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k71v1_64_bsp/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/evb6771_64_emmc/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/lk/target/k75v1_64_bsp/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/lk/target/k39tv1_bsp/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/lk/target/k39tv1_64_bsp/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/lk/target/k39tv1_bsp_512/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/lk/target/k39tv1_bsp_1g/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/lk/target/k71v1_64_bsp/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/lk/target/evb6771_64_emmc/dct/dct/codegen.dws
rootroot@rootroot-desktop:~/mt6739_android8.1$ 
rootroot@rootroot-desktop:~/mt6739_android8.1$

rootroot@rootroot-desktop:~/mt6739_android8.1$ find . -name codegen.dws
./vendor/mediatek/proprietary/custom/k39tv1_bsp_1g/kernel/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k39tv1_bsp_1g/dct/dct/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k39tv1_bsp_1g/codegen.dws
./vendor/mediatek/proprietary/bootable/bootloader/lk/target/k39tv1_bsp_1g/dct/dct/codegen.dws
rootroot@rootroot-desktop:~/mt6739_android8.1$

X:\mt6739_android8.1\vendor\mediatek\proprietary\scripts\dct\DrvGen.exe
使用DrvGen.exe编辑codegen.dws即可。

4、确认右上角部分的GPIO号：
串口：
k39tv1_bsp_1g:/ $ su
k39tv1_bsp_1g:/ # echo "0 0 0 0" > /proc/sys/kernel/printk
k39tv1_bsp_1g:/ #

k39tv1_bsp_1g:/ # cd /sys/
k39tv1_bsp_1g:/sys # 
k39tv1_bsp_1g:/sys # ls -l
total 0
drwxr-xr-x   2 root root 0 2022-03-03 08:01 block
drwxr-xr-x   2 root root 0 2022-03-03 08:12 bootinfo
drwxr-xr-x  20 root root 0 2022-03-03 08:01 bus
drwxr-xr-x  72 root root 0 2022-03-03 08:01 class
drwxr-xr-x   4 root root 0 2022-03-03 08:12 dev
drwxr-xr-x   9 root root 0 2022-03-03 08:00 devices
drwxr-xr-x   3 root root 0 2022-03-03 08:01 firmware
drwxr-xr-x   8 root root 0 2022-03-03 08:00 fs
drwxr-xr-x  10 root root 0 2022-03-03 08:00 kernel
drwxr-xr-x 128 root root 0 2022-03-03 08:01 module
drwxr-xr-x   2 root root 0 2022-03-03 08:12 mtk_rgu
drwxr-xr-x   2 root root 0 2022-03-03 08:12 mtuart
drwxr-xr-x   5 root root 0 2022-03-03 08:00 power

k39tv1_bsp_1g:/sys # 
k39tv1_bsp_1g:/sys # 
k39tv1_bsp_1g:/sys # cd devices/                                               
k39tv1_bsp_1g:/sys/devices # 
k39tv1_bsp_1g:/sys/devices # ls -l
total 0
drwxr-xr-x   3 root root 0 2022-03-03 08:13 armv7_cortex_a7
drwxr-xr-x   3 root root 0 2022-03-03 08:13 breakpoint
drwxr-xr-x 320 root root 0 2022-03-03 08:01 platform
drwxr-xr-x   3 root root 0 2022-03-03 08:13 software
drwxr-xr-x   6 root root 0 2022-03-03 08:01 system
drwxr-xr-x   3 root root 0 2022-03-03 08:13 tracepoint
drwxr-xr-x  51 root root 0 2022-03-03 08:00 virtual
k39tv1_bsp_1g:/sys/devices # 
k39tv1_bsp_1g:/sys/devices # 
k39tv1_bsp_1g:/sys/devices # cd platform/                                      
k39tv1_bsp_1g:/sys/devices/platform # 
k39tv1_bsp_1g:/sys/devices/platform # ls -l
total 0
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10000000.topckgen
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10001000.btcvsd
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10001000.infracfg_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10001000.scpsys
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002000.io_cfg_lt
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002000.iocfg_0
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002000.syscfg_pctl_lt
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002200.io_cfg_lm
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002200.iocfg_1
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002200.syscfg_pctl_lm
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002400.io_cfg_lb
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002400.iocfg_2
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002400.syscfg_pctl_lb
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002600.io_cfg_bl
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002600.iocfg_3
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002600.syscfg_pctl_bl
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002800.io_cfg_bm
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002800.iocfg_4
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002800.syscfg_pctl_bm
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002a00.io_cfg_rb
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002a00.iocfg_5
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002a00.syscfg_pctl_rb
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002c00.io_cfg_rt
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10002c00.syscfg_pctl_bl
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10003000.pericfg
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10004000.efuse_dbg
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10005000.gpio
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10005000.syscfg_pctl_a
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10006000.sleep
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10007000.toprgu
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10008000.apxgpt
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1000a000.hacc
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1000b000.pinctrl
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1000c000.apmixed
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1000ce00.fhctl
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1000d000.pwrap
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1000f000.sleep_reg_md
drwxr-xr-x  5 root root    0 2022-03-03 08:13 10010000.kp
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10011000.topmisc
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10012000.dvfsrc_top
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10013000.mbist_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10014000.apcldmain_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10014000.mdcldma
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10014400.apcldmaout_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10014800.apcldmamisc_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10014c00.apcldmamisc_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10015000.mdcldmain_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10015400.mdcldmaout_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10015800.mdcldmamisc_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10016000.aes_top0
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10017000.sys_timer
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10018000.modem_temp_share
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1001a000.security_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1001b000.topckgen_ao
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1001d000.dramc
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1001d000.dramc0
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1001e000.ddrphy
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10200000.mcucfg
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10200620.intpol-controller
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10204000.sys_cirq
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10205000.m4u
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10207000.devapc
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10208000.bus_dbg
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10209000.ap_ccif0
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1020a000.md_ccif0
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1020b000.ap_ccif1
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1020c000.md_ccif1
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1020d000.infra_mbist
drwxr-xr-x  3 root root    0 2022-03-03 08:13 1020e000.infracfg
drwxr-xr-x  3 root root    0 2022-03-03
 08:13 1020f000.trng
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10210000.dxcc_sec
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10211000.md2md_md1_ccif0
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10212000.cq_dma
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10213000.md2md_md2_ccif0
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10214000.sramrom
drwxr-xr-x  3 root root    0 2022-03-03 08:13 10219000.emi
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drwxr-xr-x  3 root root    0 2022-03-03 08:13 mtk_vibrator
drwxr-xr-x  4 root root    0 2022-03-03 08:13 mtkfb
drwxr-xr-x  3 root root    0 2022-03-03 08:13 mtktscharger
drwxr-xr-x  3 root root    0 2022-03-03 08:13 nfc
drwxr-xr-x 11 root root    0 2022-03-03 08:13 odm
drwxr-xr-x  3 root root    0 2022-03-03 08:13 otg_iddig
drwxr-xr-x  3 root root    0 2022-03-03 08:13 perfmgr
drwxr-xr-x  3 root root    0 2022-03-03 08:13 pmic_clock_buffer_ctrl
drwxr-xr-x  3 root root    0 2022-03-03 08:13 pmu
drwxr-xr-x  2 root root    0 2022-03-03 08:13 power
drwxr-xr-x  3 root root    0 2022-03-03 08:13 psci
drwxr-xr-x  3 root root    0 2022-03-03 08:13 ramoops
drwxr-xr-x  4 root root    0 2022-03-03 08:13 reg-dummy
drwxr-xr-x  3 root root    0 2022-03-03 08:13 regulatory.0
drwxr-xr-x  3 root root    0 2022-03-03 08:13 snd-soc-dummy
drwxr-xr-x  3 root root    0 2022-03-03 08:13 spm
drwxr-xr-x  3 root root    0 2022-03-03 08:13 timer
drwxr-xr-x  3 root root    0 2022-03-03 08:13 touch
drwxr-xr-x  3 root root    0 2022-03-03 08:13 trusty
-rw-r--r--  1 root root 4096 2022-03-03 08:13 uevent
drwxr-xr-x  3 root root    0 2022-03-03 08:13 usb_phy_generic.0.auto
drwxr-xr-x  3 root root    0 2022-03-03 08:00 utos
k39tv1_bsp_1g:/sys/devices/platform # 
k39tv1_bsp_1g:/sys/devices/platform # 
k39tv1_bsp_1g:/sys/devices/platform # cd soc
/system/bin/sh: cd: /sys/devices/platform/soc: No such file or directory
2|k39tv1_bsp_1g:/sys/devices/platform # 
2|k39tv1_bsp_1g:/sys/devices/platform # find . -name mt_gpio
./1000b000.pinctrl/mt_gpio
k39tv1_bsp_1g:/sys/devices/platform # 
k39tv1_bsp_1g:/sys/devices/platform # cd 1000b000.pinctrl/
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # ls -l
total 0
lrwxrwxrwx 1 root root    0 2022-03-03 08:13 driver -> ../../../bus/platform/drivers/mediatek-pinctrl
-rw-r--r-- 1 root root 4096 2022-03-03 08:13 driver_override
-r--r--r-- 1 root root 4096 2022-03-03 08:13 modalias
-rw-rw-r-- 1 root root 4096 2022-03-03 08:13 mt_gpio
lrwxrwxrwx 1 root root    0 2022-03-03 08:13 of_node -> ../../../firmware/devicetree/base/pinctrl@1000b000
drwxr-xr-x 2 root root    0 2022-03-03 08:13 power
lrwxrwxrwx 1 root root    0 2022-03-03 08:13 subsystem -> ../../../bus/platform
-rw-r--r-- 1 root root 4096 2022-03-03 08:13 uevent
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
at mt_gpio            
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 011111100 01
  31: 011111100
  36: 011111100
  65: 011111100
  68: 001000100
  69: 011111100
  88: 011111101
  89: 011111101
  92: 011111101
  94: 011111101
  96: 011111101
  97: 011111101
  98: 011111101
 110: 011111101
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl #

初步判定：GPIO68可能是在其他地方被调用了，进行了其它的配置。
模块的第106脚（右上第5脚），经过万用表检测被拉高了！
可能是原理图左边的标号不对，但是14个引脚里面有这个GPIO引脚号。
决定采用折半法将这个引脚给确认/找出来！

（一）将14个引脚全部拉低，看第5脚是否也被拉低了！
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # echo out 0 0 > mt_gpio
echo out 31 0 > mt_gpio
echo out 36 0 > mt_gpio
echo out 65 0 > mt_gpio
echo out 68 0 > mt_gpio
echo out 69 0 > mt_gpio
echo out 88 0 > mt_gpio
echo out 89 0 > mt_gpio
echo out 92 0 > mt_gpio
echo out 94 0 > mt_gpio
echo out 96 0 > mt_gpio
echo out 97 0 > mt_gpio
echo out 98 0 > mt_gpio
echo out 110 0 > mt_gpio
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
130|k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # cat mt_gpio            
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 010011100 01
  31: 010011100
  36: 010011100
  65: 010011100
  68: 010000100
  69: 010011100
  88: 010011101
  89: 010011101
  92: 010011101
  94: 010011101
  96: 010011101
  97: 010011101
  98: 010011101
 110: 010011101
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl #

（二）经过万用表确认，看第5脚确实被拉低了！
将前七个引脚拉高，看第5脚能否被拉高。
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # echo out 0 1 > mt_gpio
echo out 31 1 > mt_gpio
echo out 36 1 > mt_gpio
echo out 65 1 > mt_gpio
echo out 68 1 > mt_gpio
echo out 69 1 > mt_gpio
echo out 88 1 > mt_gpio
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # cat mt_gpio            
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 011111100 01
  31: 011111100
  36: 011111100
  65: 011111100
  68: 011100100
  69: 011111100
  88: 011111101
  89: 010011101
  92: 010011101
  94: 010011101
  96: 010011101
  97: 010011101
  98: 010011101
 110: 010011101
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl #

（三）经过万用表确认，看第5脚确实被拉高了！
将前四个引脚拉低，看第5脚能否被拉低。

k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # echo out 0 0 > mt_gpio
echo out 31 0 > mt_gpio
echo out 36 0 > mt_gpio
echo out 65 0 > mt_gpio
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
at mt_gpio            
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 010011100 01
  31: 010011100
  36: 010011100
  65: 010011100
  68: 011100100
  69: 011111100
  88: 011111101
  89: 010011101
  92: 010011101
  94: 010011101
  96: 010011101
  97: 010011101
  98: 010011101
 110: 010011101
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl #

（四）经过万用表确认，看第5脚确实被拉低了！
将前两个引脚拉高，看第5脚能否被拉高。

k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # echo out 0 1 > mt_gpio
echo out 31 1 > mt_gpio
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # cat mt_gpio
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 011111100 01
  31: 011111100
  36: 010011100
  65: 010011100
  68: 011100100
  69: 011111100
  88: 011111101
  89: 010011101
  92: 010011101
  94: 010011101
  96: 010011101
  97: 010011101
  98: 010011101
 110: 010011101
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl #

（五）经过万用表确认，看第5脚确实被拉高了！
将前两个引脚挨个拉低，看第5脚能否被拉低。

k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # 
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # echo out 0 0 > mt_gpio
echo out 31 0 > mt_gpio
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl # cat mt_gpio
PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )
   0: 010011100 01
  31: 010011100
  36: 010011100
  65: 010011100
  68: 011100100
  69: 011111100
  88: 011111101
  89: 010011101
  92: 010011101
  94: 010011101
  96: 010011101
  97: 010011101
  98: 010011101
 110: 010011101
k39tv1_bsp_1g:/sys/devices/platform/1000b000.pinctrl

（六）经过万用表确认，在GPIO31被拉低的时候，第5脚确实被拉低了！
第5脚是GPIO31。

再次核对原理图，发现标注为：GPIO_98和SPIOCS_GPIO31
看来GPIO的引脚号码是以右边的标号为准！

5、同样的方法，很容易确认OTG的ID引脚（USB_ID）GPIO50。
GPIO1
GPIO16
GPIO25
GPIO31
GPIO35
GPIO50
GPIO93

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