pinmux is handled in the following addresses:

  * [[https://svanheule.net/realtek/longan/register/io_driving_ability_ctrl0|IO drive strength control@0xbb000208]]
  * [[https://svanheule.net/realtek/longan/register/io_driving_ability_ctrl1|IO Slew rate control@0xbb00020c]]
  * [[https://svanheule.net/realtek/longan/register/io_driving_ability_ctrl6|IO Schmitt trigger control@0xbb00021c]]

  * [[https://svanheule.net/realtek/longan/register/i2c_mst_glb_ctrl|GPIO or I2C-SDA pinmux@0xbb000384]](09, 10, 11, 12, 13, 14, 15, 16)
  * [[https://svanheule.net/realtek/longan/register/i2c_mst1_ctrl1|GPIO or I2C-SCL pinmux@0xbb00036c]](08)
  * [[https://svanheule.net/realtek/longan/register/i2c_mst2_ctrl1|GPIO or I2C-SCL pinmux@0xbb000388]](17)
  * [[https://svanheule.net/realtek/longan/register/spi_ctrl1|GPIO or SPI pinmux@0xbb0003a0]](03, 04, 05, 06, 07)
  * [[https://svanheule.net/realtek/longan/register/gpio_sel_ctrl|GPIO or LEDSYNC/USB/CS/DO pinmux@0xbb000200]](18, 19, all)
  * [[https://svanheule.net/realtek/longan/register/jtag_sel_ctrl|GPIO or JTAG|]](all)
  * [[https://svanheule.net/realtek/longan/register/led_glb_ctrl|GPIO or LED_STACK]](23)
  * [[https://svanheule.net/realtek/longan/register/ext_gpio_glb_ctrl|GPIO or MDIO/MDC]](01, 02)
  * [[https://svanheule.net/realtek/longan/register/ext_smi_access_ctrl|GPIO or MDX-MDIO/MDC]](21, 22)