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[RFC,1/3] Documentation: dt: add ti,am3352-emif bindings

Message ID 8103cf8683cac55efdd690c61f44005289e62856.1417029919.git.d-gerlach@ti.com
State Needs Review / ACK, archived
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Commit Message

Dave Gerlach Nov. 26, 2014, 9:39 p.m. UTC 
Add the device tree bindings document for ti,am3352-emif which
is used by the ti-emif-sram driver to provide low-level PM
functionality.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
---
 .../bindings/memory-controllers/ti/emif-sram.txt   | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/ti/emif-sram.txt
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diff --git a/Documentation/devicetree/bindings/memory-controllers/ti/emif-sram.txt b/Documentation/devicetree/bindings/memory-controllers/ti/emif-sram.txt
new file mode 100644
index 0000000..72d6db0
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/ti/emif-sram.txt
@@ -0,0 +1,31 @@ 
+EMIF SRAM Driver
+=====================
+
+TI AMx3 family of devices use a similar EMIF to other TI SoCs but have
+different PM requirements. Late suspend code runs from SRAM and requires
+save and restore of EMIF context and placing the SDRAM in and out of
+self-refresh. Because of this, the ti-emif-sram driver introduces
+relocatable PM function that can run from SRAM and place the EMIF in
+the proper state for low-power mode transition.
+
+EMIF Device Node:
+====================
+A emif node is used to represent an EMIF IP instance within an SoC. The node
+must contain a phandle to an sram node so the ti-emif-sram driver can allocate
+space within the sram and copy the relocatable PM functions.
+
+Required properties:
+--------------------
+- compatible:		Should be "ti,am3352-emif" for AM33xx SoCs
+- reg:			Contains the emif register address ranges.
+- sram:			Phandle for generic sram node for the driver
+			to use to copy PM functions to.
+
+Example:
+--------
+/* AM33xx */
+emif: emif@4c000000 {
+	compatible = "ti,am3352-emif";
+	reg =	<0x4C000000 0x1000>;
+	sram = <&ocmcram>;
+};