VAR-SOM-SD600 gpio

GPIOs features

The APQ8064 SoC GPIOs features are as follows

• 90 GPIO pins (GPIO_0 to GPIO_89)
• Configurable pull-up/down
• Configurable output drive current
• Interruptable GPIOs

GPIO manipulation

GPIO manipulation is done through the standard gpiolib
The usage / API is well described in kernel/Documentation/gpio.txt.

Additional useful links:

http://elinux.org/GPIO

https://developer.ridgerun.com/wiki/index.php/Gpio-int-test.c

https://developer.ridgerun.com/wiki/index.php/How_to_use_GPIO_signals

http://mondi.web.cs.unibo.it/gpio_control.html

PinMux configuration

GPIO mux configuration is done in kernel\arch\arm\mach-msm\board-8064-gpiomux.c At apq8064_init_gpiomux(void) you can find several examples of pinmux configuration. or example struct apq8064_gsbi2_UART2_configs configures GPIO pins 22,23,24 and 25 to serial port.

Generic serial bus interface (GSBI)

The APQ8064 implements twelve Generic Serial Bus Interface (GSBI) ports. GSBI ports :an be configured for:

• UART_DM
• I2C
• SPI
• General-purpose I/O (GPIO) bits

Please refer to datasheet section: "Table ‎4_2 Detailed serial interface pinout" for elaborated list.