From 10a6218e382d9fafd4c2add1b171d89a079c5a47 Mon Sep 17 00:00:00 2001 From: Brendan Higgins Date: Tue, 20 Jun 2017 14:15:14 -0700 Subject: [PATCH] i2c: aspeed: added documentation for Aspeed I2C driver Added device tree binding documentation for Aspeed I2C busses. Signed-off-by: Brendan Higgins Acked-by: Rob Herring Signed-off-by: Wolfram Sang --- .../devicetree/bindings/i2c/i2c-aspeed.txt | 48 +++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 Documentation/devicetree/bindings/i2c/i2c-aspeed.txt diff --git a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt new file mode 100644 index 000000000000..bd6480b19535 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt @@ -0,0 +1,48 @@ +Device tree configuration for the I2C busses on the AST24XX and AST25XX SoCs. + +Required Properties: +- #address-cells : should be 1 +- #size-cells : should be 0 +- reg : address offset and range of bus +- compatible : should be "aspeed,ast2400-i2c-bus" + or "aspeed,ast2500-i2c-bus" +- clocks : root clock of bus, should reference the APB + clock +- interrupts : interrupt number +- interrupt-parent : interrupt controller for bus, should reference a + aspeed,ast2400-i2c-ic or aspeed,ast2500-i2c-ic + interrupt controller + +Optional Properties: +- bus-frequency : frequency of the bus clock in Hz defaults to 100 kHz when not + specified +- multi-master : states that there is another master active on this bus. + +Example: + +i2c { + compatible = "simple-bus"; + #address-cells = <1>; + #size-cells = <1>; + ranges = <0 0x1e78a000 0x1000>; + + i2c_ic: interrupt-controller@0 { + #interrupt-cells = <1>; + compatible = "aspeed,ast2400-i2c-ic"; + reg = <0x0 0x40>; + interrupts = <12>; + interrupt-controller; + }; + + i2c0: i2c-bus@40 { + #address-cells = <1>; + #size-cells = <0>; + #interrupt-cells = <1>; + reg = <0x40 0x40>; + compatible = "aspeed,ast2400-i2c-bus"; + clocks = <&clk_apb>; + bus-frequency = <100000>; + interrupts = <0>; + interrupt-parent = <&i2c_ic>; + }; +}; -- 2.45.2