diff options
Diffstat (limited to 'doc/device-tree-bindings')
| -rw-r--r-- | doc/device-tree-bindings/i2c/i2c-at91.txt | 26 | ||||
| -rw-r--r-- | doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt | 66 |
2 files changed, 92 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/i2c/i2c-at91.txt b/doc/device-tree-bindings/i2c/i2c-at91.txt new file mode 100644 index 0000000000..2065b7341a --- /dev/null +++ b/doc/device-tree-bindings/i2c/i2c-at91.txt @@ -0,0 +1,26 @@ +I2C for Atmel platforms + +Required properties : +- compatible : Must be "atmel,at91rm9200-i2c", "atmel,at91sam9261-i2c", + "atmel,at91sam9260-i2c", "atmel,at91sam9g20-i2c", "atmel,at91sam9g10-i2c", + "atmel,at91sam9x5-i2c", "atmel,sama5d4-i2c" or "atmel,sama5d2-i2c". +- reg: physical base address of the controller and length of memory mapped + region. +- #address-cells = <1>; +- #size-cells = <0>; +- clocks: phandles to input clocks. + +Optional properties: +- clock-frequency: Desired I2C bus frequency in Hz, default value is 100000. +- Child nodes conforming to i2c bus binding. + +Examples : + +i2c0: i2c@f8028000 { + compatible = "atmel,sama5d2-i2c"; + reg = <0xf8028000 0x100>; + #address-cells = <1>; + #size-cells = <0>; + clocks = <&twi0_clk>; + clock-frequency = <100000>; +}; diff --git a/doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt b/doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt new file mode 100644 index 0000000000..a1b559668f --- /dev/null +++ b/doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt @@ -0,0 +1,66 @@ +* Atmel PIO4 Controller + +The Atmel PIO4 controller is used to select the function of a pin and to +configure it. + +Required properties: +- compatible: "atmel,sama5d2-pinctrl". +- reg: base address and length of the PIO controller. + +Please refer to pinctrl-bindings.txt in this directory for details of the +common pinctrl bindings used by client devices. + +Subnode format +Each node (or subnode) will list the pins it needs and how to configured these +pins. + + node { + pinmux = <PIN_NUMBER_PINMUX>; + GENERIC_PINCONFIG; + }; + +Required properties: +- pinmux: integer array. Each integer represents a pin number plus mux and +ioset settings. Use the macros from boot/dts/<soc>-pinfunc.h file to get the +right representation of the pin. + +Optional properties: +- GENERIC_PINCONFIG: generic pinconfig options to use, bias-disable, +bias-pull-down, bias-pull-up, drive-open-drain, input-schmitt-enable, +input-debounce. + +Example: + +#include <sama5d2-pinfunc.h> + +... +{ + spi0: spi@f8000000 { + cs-gpios = <&pioA 17 0>, <0>, <0>, <0>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_spi0_default>; + status = "okay"; + + spi_flash@0 { + compatible = "spi-flash"; + reg = <0>; + spi-max-frequency = <50000000>; + }; + }; + + ... + + pioA: pinctrl@fc038000 { + compatible = "atmel,sama5d2-pinctrl"; + reg = <0xfc038000 0x600>; + + pinctrl_spi0_default: spi0_default { + pinmux = <PIN_PA14__SPI0_SPCK>, + <PIN_PA15__SPI0_MOSI>, + <PIN_PA16__SPI0_MISO>; + bias-disable; + }; + ... + }; +}; +... |