OMAP SSI controller bindings
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OMAP3's Synchronous Serial Interface (SSI) controller implements a
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legacy variant of MIPI's High Speed Synchronous Serial Interface (HSI),
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while the controller found inside OMAP4 is supposed to be fully compliant
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with the HSI standard.
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Required properties:
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- compatible: Should include "ti,omap3-ssi" or "ti,omap4-hsi"
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- reg-names: Contains the values "sys" and "gdd" (in this order).
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- reg: Contains a matching register specifier for each entry
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in reg-names.
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- interrupt-names: Contains the value "gdd_mpu".
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- interrupts: Contains matching interrupt information for each entry
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in interrupt-names.
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- ranges: Represents the bus address mapping between the main
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controller node and the child nodes below.
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- clock-names: Must include the following entries:
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"ssi_ssr_fck": The OMAP clock of that name
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"ssi_sst_fck": The OMAP clock of that name
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"ssi_ick": The OMAP clock of that name
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- clocks: Contains a matching clock specifier for each entry in
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clock-names.
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- #address-cells: Should be set to <1>
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- #size-cells: Should be set to <1>
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Each port is represented as a sub-node of the ti,omap3-ssi device.
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Required Port sub-node properties:
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- compatible: Should be set to the following value
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ti,omap3-ssi-port (applicable to OMAP34xx devices)
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ti,omap4-hsi-port (applicable to OMAP44xx devices)
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- reg-names: Contains the values "tx" and "rx" (in this order).
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- reg: Contains a matching register specifier for each entry
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in reg-names.
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- interrupts: Should contain interrupt specifiers for mpu interrupts
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0 and 1 (in this order).
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- ti,ssi-cawake-gpio: Defines which GPIO pin is used to signify CAWAKE
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events for the port. This is an optional board-specific
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property. If it's missing the port will not be
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enabled.
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Optional properties:
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- ti,hwmods: Shall contain TI interconnect module name if needed
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by the SoC
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Example for Nokia N900:
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ssi-controller@48058000 {
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compatible = "ti,omap3-ssi";
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/* needed until hwmod is updated to use the compatible string */
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ti,hwmods = "ssi";
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reg = <0x48058000 0x1000>,
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<0x48059000 0x1000>;
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reg-names = "sys",
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"gdd";
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interrupts = <55>;
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interrupt-names = "gdd_mpu";
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clocks = <&ssi_ssr_fck>,
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<&ssi_sst_fck>,
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<&ssi_ick>;
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clock-names = "ssi_ssr_fck",
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"ssi_sst_fck",
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"ssi_ick";
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#address-cells = <1>;
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#size-cells = <1>;
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ranges;
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ssi-port@4805a000 {
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compatible = "ti,omap3-ssi-port";
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reg = <0x4805a000 0x800>,
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<0x4805a800 0x800>;
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reg-names = "tx",
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"rx";
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interrupt-parent = <&intc>;
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interrupts = <67>,
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<68>;
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ti,ssi-cawake-gpio = <&gpio5 23 GPIO_ACTIVE_HIGH>; /* 151 */
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}
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ssi-port@4805a000 {
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compatible = "ti,omap3-ssi-port";
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reg = <0x4805b000 0x800>,
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<0x4805b800 0x800>;
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reg-names = "tx",
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"rx";
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interrupt-parent = <&intc>;
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interrupts = <69>,
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<70>;
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}
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}
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