1AXP209 GPIO & pinctrl controller 2 3This driver follows the usual GPIO bindings found in 4Documentation/devicetree/bindings/gpio/gpio.txt 5 6This driver follows the usual pinctrl bindings found in 7Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt 8 9This driver employs the per-pin muxing pattern. 10 11Required properties: 12- compatible: Should be one of: 13 - "x-powers,axp209-gpio" 14 - "x-powers,axp813-gpio" 15- #gpio-cells: Should be two. The first cell is the pin number and the 16 second is the GPIO flags. 17- gpio-controller: Marks the device node as a GPIO controller. 18 19This node must be a subnode of the axp20x PMIC, documented in 20Documentation/devicetree/bindings/mfd/axp20x.txt 21 22Example: 23 24axp209: pmic@34 { 25 compatible = "x-powers,axp209"; 26 reg = <0x34>; 27 interrupt-parent = <&nmi_intc>; 28 interrupts = <0 IRQ_TYPE_LEVEL_LOW>; 29 interrupt-controller; 30 #interrupt-cells = <1>; 31 32 axp_gpio: gpio { 33 compatible = "x-powers,axp209-gpio"; 34 gpio-controller; 35 #gpio-cells = <2>; 36 }; 37}; 38 39The GPIOs can be muxed to other functions and therefore, must be a subnode of 40axp_gpio. 41 42Example: 43 44&axp_gpio { 45 gpio0_adc: gpio0-adc { 46 pins = "GPIO0"; 47 function = "adc"; 48 }; 49}; 50 51&example_node { 52 pinctrl-names = "default"; 53 pinctrl-0 = <&gpio0_adc>; 54}; 55 56GPIOs and their functions 57------------------------- 58 59Each GPIO is independent from the other (i.e. GPIO0 in gpio_in function does 60not force GPIO1 and GPIO2 to be in gpio_in function as well). 61 62axp209 63------ 64GPIO | Functions 65------------------------ 66GPIO0 | gpio_in, gpio_out, ldo, adc 67GPIO1 | gpio_in, gpio_out, ldo, adc 68GPIO2 | gpio_in, gpio_out 69 70axp813 71------ 72GPIO | Functions 73------------------------ 74GPIO0 | gpio_in, gpio_out, ldo, adc 75GPIO1 | gpio_in, gpio_out, ldo 76