【嵌入式Linux内核驱动】Pinctrl子系统

Pinctrl子系统

暴露到应用层

$ cat  /sys/kernel/debug/gpio  //查看gpio 暴露的调试信息
$ cat  /sys/kernel/debug/tegra_pinctrl_reg
$ ls   /sys/kernel/debug/pinctrl/
$ cat  /sys/kernel/debug/pinctrl/pinctrl-handles //查看pinmux map对应的处理函数

GPIO当前配置情况

//注： gpio-79： 是内核gpio子系统里，对管脚的编号（是经过映射转化的）
//     I2S0_SCLK ： 是该管脚在电路图上的标号
gpiochip0: GPIOs 0-255, parent: platform/6000d000.gpio, tegra-gpio:
内核里编号 电路图标号            |当前使用者           输出 高电平
 gpio-0   (                    )
 gpio-1   (                    )
 gpio-2   (                    |pcie_wake           ) in  hi    
 gpio-3   (                    )
 ...
 gpio-6   (                    |system-suspend-gpio ) out hi    
 ...
 gpio-11  (                    )
 gpio-12  (SPI1_MOSI           )
 gpio-13  (SPI1_MISO           )
 gpio-14  (SPI1_SCK            )
 gpio-15  (SPI1_CS0            )
 gpio-16  (SPI0_MOSI           )
 gpio-17  (SPI0_MISO           )
 gpio-18  (SPI0_SCK            )
 gpio-19  (SPI0_CS0            )
 gpio-20  (SPI0_CS1            )
 ...
 gpio-38  (GPIO13              )
 ...
 gpio-50  (UART1_RTS           )
 gpio-51  (UART1_CTS           )
 ...
 gpio-64  (                    |i2c-mux-gpio        ) out hi
 ...
 gpio-76  (I2S0_FS             )
 gpio-77  (I2S0_DIN            )
 gpio-78  (I2S0_DOUT           )
 gpio-79  (I2S0_SCLK           |?                   ) out hi   
 ... 
 gpio-149 (GPIO01              )
 gpio-150 (                    )
 gpio-151 (                    |cam_reset_gpio      ) out lo
 ...
 gpio-168 (GPIO07              )
 ...
 gpio-187 (                    |?                   ) out hi
 gpio-188 (                    )
 gpio-189 (                    |Power               ) in  hi IRQ
 gpio-190 (                    |Forcerecovery       ) in  hi IRQ
 ...
 gpio-194 (GPIO12              )
 ...
 gpio-200 (GPIO11              )
 gpio-201 (                    |cd                  ) in  lo IRQ
 gpio-202 (                    )
 gpio-203 (                    |vdd-3v3-sd          ) out hi
 ...
 gpio-216 (GPIO09              )
 ...
 gpio-239 (                    )
gpiochip1: GPIOs 504-511, parent: platform/max77620-gpio, max77620-gpio, can sleep:
 gpio-505 (                    |spmic-default-output) out hi
 gpio-507 (                    |vdd-3v3-sys         ) out hi
 gpio-510 (                    |enable              ) out lo
 gpio-511 (                    |avdd-io-edp-1v05    ) out lo  

管脚复用寄存器的值

Bank: 1 Reg: 0x70003000 Val: 0x00003040 -> sdmmc1_clk_pm0
Bank: 1 Reg: 0x70003004 Val: 0x00003048 -> sdmmc1_cmd_pm1
Bank: 1 Reg: 0x70003008 Val: 0x00003048 -> sdmmc1_dat3_pm2
Bank: 1 Reg: 0x7000300c Val: 0x00003048 -> sdmmc1_dat2_pm3
Bank: 1 Reg: 0x70003010 Val: 0x00003048 -> sdmmc1_dat1_pm4
Bank: 1 Reg: 0x70003014 Val: 0x00003048 -> sdmmc1_dat0_pm5
Bank: 1 Reg: 0x700032b4 Val: 0x00000000 -> sdmmc2_clk
Bank: 1 Reg: 0x700032b8 Val: 0x00000000 -> sdmmc2_clkb
Bank: 1 Reg: 0x700032bc Val: 0x00000000 -> sdmmc2_cmd
Bank: 1 Reg: 0x70003294 Val: 0x00000000 -> sdmmc2_dat0
Bank: 1 Reg: 0x70003298 Val: 0x00000000 -> sdmmc2_dat1
Bank: 1 Reg: 0x7000329c Val: 0x00000000 -> sdmmc2_dat2
Bank: 1 Reg: 0x700032a0 Val: 0x00000000 -> sdmmc2_dat3
Bank: 1 Reg: 0x700032a4 Val: 0x00000000 -> sdmmc2_dat4
Bank: 1 Reg: 0x700032a8 Val: 0x00000000 -> sdmmc2_dat5
Bank: 1 Reg: 0x700032ac Val: 0x00000000 -> sdmmc2_dat6
Bank: 1 Reg: 0x700032b0 Val: 0x00000000 -> sdmmc2_dat7
Bank: 1 Reg: 0x700032c0 Val: 0x00000000 -> sdmmc2_dqs
Bank: 1 Reg: 0x700032c4 Val: 0x00000000 -> sdmmc2_dqsb
Bank: 1 Reg: 0x7000301c Val: 0x00002040 -> sdmmc3_clk_pp0
Bank: 1 Reg: 0x70003020 Val: 0x00002048 -> sdmmc3_cmd_pp1
Bank: 1 Reg: 0x70003024 Val: 0x00002048 -> sdmmc3_dat0_pp5
Bank: 1 Reg: 0x70003028 Val: 0x00002048 -> sdmmc3_dat1_pp4
Bank: 1 Reg: 0x7000302c Val: 0x00002048 -> sdmmc3_dat2_pp3
Bank: 1 Reg: 0x70003030 Val: 0x00002048 -> sdmmc3_dat3_pp2
Bank: 1 Reg: 0x70003038 Val: 0x00000400 -> pex_l0_rst_n_pa0
Bank: 1 Reg: 0x7000303c Val: 0x00000450 -> pex_l0_clkreq_n_pa1
Bank: 1 Reg: 0x70003040 Val: 0x00000440 -> pex_wake_n_pa2
Bank: 1 Reg: 0x70003044 Val: 0x00000400 -> pex_l1_rst_n_pa3
Bank: 1 Reg: 0x70003048 Val: 0x00000440 -> pex_l1_clkreq_n_pa4
Bank: 1 Reg: 0x7000304c Val: 0x00000049 -> sata_led_active_pa5
Bank: 1 Reg: 0x7000304c Val: 0x00000049 -> pa5
Bank: 1 Reg: 0x70003050 Val: 0x0000e015 -> spi1_mosi_pc0
Bank: 1 Reg: 0x70003054 Val: 0x0000e015 -> spi1_miso_pc1
Bank: 1 Reg: 0x70003058 Val: 0x0000e015 -> spi1_sck_pc2
Bank: 1 Reg: 0x7000305c Val: 0x0000e015 -> spi1_cs0_pc3
Bank: 1 Reg: 0x70003060 Val: 0x0000e015 -> spi1_cs1_pc4
Bank: 1 Reg: 0x70003064 Val: 0x00006016 -> spi2_mosi_pb4
Bank: 1 Reg: 0x70003068 Val: 0x00006016 -> spi2_miso_pb5
Bank: 1 Reg: 0x7000306c Val: 0x00006016 -> spi2_sck_pb6
Bank: 1 Reg: 0x70003070 Val: 0x00006016 -> spi2_cs0_pb7
Bank: 1 Reg: 0x70003074 Val: 0x00006015 -> spi2_cs1_pdd0
Bank: 1 Reg: 0x70003078 Val: 0x0000e015 -> spi4_mosi_pc7
Bank: 1 Reg: 0x7000307c Val: 0x0000e015 -> spi4_miso_pd0
Bank: 1 Reg: 0x70003080 Val: 0x0000e015 -> spi4_sck_pc5
Bank: 1 Reg: 0x70003084 Val: 0x0000e015 -> spi4_cs0_pc6
Bank: 1 Reg: 0x70003088 Val: 0x00002040 -> qspi_sck_pee0
Bank: 1 Reg: 0x7000308c Val: 0x00002000 -> qspi_cs_n_pee1
Bank: 1 Reg: 0x70003090 Val: 0x00002040 -> qspi_io0_pee2
Bank: 1 Reg: 0x70003094 Val: 0x00002040 -> qspi_io1_pee3
Bank: 1 Reg: 0x70003098 Val: 0x00002040 -> qspi_io2_pee4
Bank: 1 Reg: 0x7000309c Val: 0x00002040 -> qspi_io3_pee5
Bank: 1 Reg: 0x700030a4 Val: 0x00000041 -> dmic1_clk_pe0
Bank: 1 Reg: 0x700030a8 Val: 0x00000041 -> dmic1_dat_pe1
Bank: 1 Reg: 0x700030ac Val: 0x00000041 -> dmic2_clk_pe2
Bank: 1 Reg: 0x700030b0 Val: 0x00000041 -> dmic2_dat_pe3
Bank: 1 Reg: 0x700030b4 Val: 0x00000016 -> dmic3_clk_pe4
Bank: 1 Reg: 0x700030b8 Val: 0x00000016 -> dmic3_dat_pe5
Bank: 1 Reg: 0x700030bc Val: 0x00000440 -> gen1_i2c_scl_pj1
Bank: 1 Reg: 0x700030c0 Val: 0x00000440 -> gen1_i2c_sda_pj0
Bank: 1 Reg: 0x700030c4 Val: 0x00000440 -> gen2_i2c_scl_pj2
Bank: 1 Reg: 0x700030c8 Val: 0x00000440 -> gen2_i2c_sda_pj3
Bank: 1 Reg: 0x700030cc Val: 0x00000040 -> gen3_i2c_scl_pf0
Bank: 1 Reg: 0x700030d0 Val: 0x00000040 -> gen3_i2c_sda_pf1
Bank: 1 Reg: 0x700030d4 Val: 0x00000441 -> cam_i2c_scl_ps2
Bank: 1 Reg: 0x700030d8 Val: 0x00000441 -> cam_i2c_sda_ps3
Bank: 1 Reg: 0x700030dc Val: 0x00000040 -> pwr_i2c_scl_py3
Bank: 1 Reg: 0x700030e0 Val: 0x00000040 -> pwr_i2c_sda_py4
Bank: 1 Reg: 0x700030e4 Val: 0x00000000 -> uart1_tx_pu0
Bank: 1 Reg: 0x700030e8 Val: 0x00000040 -> uart1_rx_pu1
Bank: 1 Reg: 0x700030ec Val: 0x00000015 -> uart1_rts_pu2
Bank: 1 Reg: 0x700030f0 Val: 0x00000015 -> uart1_cts_pu3
Bank: 1 Reg: 0x700030f4 Val: 0x00000000 -> uart2_tx_pg0
Bank: 1 Reg: 0x700030f8 Val: 0x00000044 -> uart2_rx_pg1
Bank: 1 Reg: 0x700030fc Val: 0x00000016 -> uart2_rts_pg2
Bank: 1 Reg: 0x70003100 Val: 0x00000016 -> uart2_cts_pg3
Bank: 1 Reg: 0x70003104 Val: 0x00000000 -> uart3_tx_pd1
Bank: 1 Reg: 0x70003108 Val: 0x00000040 -> uart3_rx_pd2
Bank: 1 Reg: 0x7000310c Val: 0x00000008 -> uart3_rts_pd3
Bank: 1 Reg: 0x70003110 Val: 0x00000048 -> uart3_cts_pd4
Bank: 1 Reg: 0x70003114 Val: 0x00000000 -> uart4_tx_pi4
Bank: 1 Reg: 0x70003118 Val: 0x00000040 -> uart4_rx_pi5
Bank: 1 Reg: 0x7000311c Val: 0x00000000 -> uart4_rts_pi6
Bank: 1 Reg: 0x70003120 Val: 0x00000048 -> uart4_cts_pi7
Bank: 1 Reg: 0x70003124 Val: 0x00006015 -> dap1_fs_pb0
Bank: 1 Reg: 0x70003128 Val: 0x00006015 -> dap1_din_pb