From a0256b255f3172a9367145b1a6686d3324b2724e Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Sun, 15 Dec 2013 23:43:10 +0100 Subject: Documentation: DT: omap-ssi binding documentation Create device tree binding documentation for OMAP Synchronous Serial Interface (SSI) device. Signed-off-by: Sebastian Reichel --- Documentation/devicetree/bindings/hsi/omap-ssi.txt | 85 ++++++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 Documentation/devicetree/bindings/hsi/omap-ssi.txt diff --git a/Documentation/devicetree/bindings/hsi/omap-ssi.txt b/Documentation/devicetree/bindings/hsi/omap-ssi.txt new file mode 100644 index 000000000000..709419ba5ce1 --- /dev/null +++ b/Documentation/devicetree/bindings/hsi/omap-ssi.txt @@ -0,0 +1,85 @@ +OMAP SSI controller bindings + +OMAP Synchronous Serial Interface (SSI) controller implements a legacy +variant of MIPI's High Speed Synchronous Serial Interface (HSI). + +Required properties: +- compatible: Should include "ti,omap3-ssi". +- reg-names: Contains the values "sys" and "gdd". +- reg: Contains a register specifier for each entry in + reg-names. +- interrupt-names: Contains the value "gdd_mpu". +- interrupts: Contains interrupt information for each entry in + interrupt-names. +- ranges: Represents the bus address mapping between the main + controller node and the child nodes below. +- clocks: Contains clock specifiers for each entry in + clock-names. +- clock-names: Must include the following entries: + "ssi_ssr_fck": The OMAP clock of that name + "ssi_sst_fck": The OMAP clock of that name + "ssi_ick": The OMAP clock of that name +- #address-cells: Should be set to <1> +- #size-cells: Should be set to <1> + +Each port is represented as a sub-node of the ti,omap3-ssi device. + +Required Port sub-node properties: +- compatible: Should be set to the following value + ti,omap3-ssi-port (applicable to OMAP34xx devices) +- reg-names: Contains the values "rx" and "tx". +- reg: Contains a register specifier for each entry in + reg-names. +- interrupt-parent Should be a phandle for the interrupt controller +- interrupt-names: Contains the values "mpu_irq0" and "mpu_irq1". +- interrupts: Contains interrupt information for each entry in + interrupt-names. +- ti,ssi-cawake-gpio: Defines which GPIO pin is used to signify CAWAKE + events for the port. This is an optional board-specific + property. If it's missing the port will not be + enabled. + +Example for Nokia N900: + +ssi-controller@48058000 { + compatible = "ti,omap3-ssi"; + + /* needed until hwmod is updated to use the compatible string */ + ti,hwmods = "ssi"; + + reg = <0x48058000 0x1000>, + <0x48059000 0x1000>; + reg-names = "sys", + "gdd"; + + interrupts = <55>; + interrupt-names = "gdd_mpu"; + + clocks = <&ssi_ssr_fck>, + <&ssi_sst_fck>, + <&ssi_ick>; + clock-names = "ssi_ssr_fck", + "ssi_sst_fck", + "ssi_ick"; + + #address-cells = <1>; + #size-cells = <1>; + ranges; + + ssi-port@0 { + compatible = "ti,omap3-ssi-port"; + + reg = <0x4805a000 0x800>, + <0x4805a800 0x800>; + reg-names = "tx", + "rx"; + + interrupt-parent = <&intc>; + interrupts = <51>, + <52>; + interrupt-names = "mpu_irq0", + "mpu_irq1"; + + ti,ssi-cawake-gpio = <&gpio5 23 GPIO_ACTIVE_HIGH>; /* 151 */ + } +} -- cgit v1.2.3