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Subject[PATCHv3 09/14] Documentation: DT: omap-ssi binding documentation
Date
Create device tree binding documentation for
OMAP Synchronous Serial Interface (SSI) device.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
---
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 0000000..709419b
--- /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 */
+ }
+}
--
1.9.0


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