From: Alex Smith <alex.smith@xxxxxxxxxx>
Add device tree bindings for the NAND/External Memory Controller (NEMC)
on Ingenic JZ4780
Signed-off-by: Alex Smith <alex@xxxxxxxxxxxxxxxx>
Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@xxxxxxxxxx>
---
.../memory-controllers/ingenic,jz4780-nemc.txt | 75 ++++++++++++++++++++++
1 file changed, 75 insertions(+)
create mode 100644 Documentation/devicetree/bindings/memory-controllers/ingenic,jz4780-nemc.txt
diff --git a/Documentation/devicetree/bindings/memory-controllers/ingenic,jz4780-nemc.txt b/Documentation/devicetree/bindings/memory-controllers/ingenic,jz4780-nemc.txt
new file mode 100644
index 0000000..f936b55
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/ingenic,jz4780-nemc.txt
@@ -0,0 +1,75 @@
+* Ingenic JZ4780 NAND/external memory controller (NEMC)
+
+This file documents the device tree bindings for the NEMC external memory
+controller in Ingenic JZ4780
+
+Required properties:
+- compatible: Should be set to one of:
+ "ingenic,jz4780-nemc" (JZ4780)
+- reg: Should specify the NEMC controller registers location and length.
+- clocks: Clock for the NEMC controller.
+- #address-cells: Must be set to 2.
+- #size-cells: Must be set to 1.
+- ranges: A set of ranges for each bank describing the physical memory layout.
+ Each should specify the following 4 integer values:
+
+ <cs number> 0 <physical address of mapping> <size of mapping>
+
+Each child of the NEMC node describes a device connected to the NEMC.
+
+Required child node properties:
+- reg: Should contain at least one register specifier, given in the following
+ format:
+
+ <cs number> <offset> <size>
+
+ Multiple registers can be specified across multiple banks. This is needed,
+ for example, for packaged NAND devices with multiple dies. Such devices
+ should be grouped into a single node.
+
+Optional child node properties:
+- ingenic,nemc-bus-width: Specifies the bus width in bits. Defaults to 8 bits.
+- ingenic,nemc-tAS: Address setup time in nanoseconds.
+- ingenic,nemc-tAH: Address hold time in nanoseconds.
+- ingenic,nemc-tBP: Burst pitch time in nanoseconds.
+- ingenic,nemc-tAW: Access wait time in nanoseconds.
+- ingenic,nemc-tSTRV: Static memory recovery time in nanoseconds.
+
+If a child node references multiple banks in its "reg" property, the same value
+for all optional parameters will be configured for all banks. If any optional
+parameters are omitted, they will be left unchanged from whatever they are
+configured to when the NEMC device is probed (which may be the reset value as
+given in the hardware reference manual, or a value configured by the boot
+loader).
+
+Example (NEMC node with a NAND child device attached at CS1):
+
+nemc: nemc@13410000 {
+ compatible = "ingenic,jz4780-nemc";
+ reg = <0x13410000 0x10000>;
+
+ #address-cells = <2>;
+ #size-cells = <1>;
+
+ ranges = <1 0 0x1b000000 0x1000000
+ 2 0 0x1a000000 0x1000000
+ 3 0 0x19000000 0x1000000
+ 4 0 0x18000000 0x1000000
+ 5 0 0x17000000 0x1000000
+ 6 0 0x16000000 0x1000000>;
+
+ clocks = <&cgu JZ4780_CLK_NEMC>;
+
+ nand: nand@1 {
+ compatible = "ingenic,jz4780-nand";
+ reg = <1 0 0x1000000>;
+
+ ingenic,nemc-tAS = <10>;
+ ingenic,nemc-tAH = <5>;
+ ingenic,nemc-tBP = <10>;
+ ingenic,nemc-tAW = <15>;
+ ingenic,nemc-tSTRV = <100>;
+
+ ...
+ };
+};
--
1.9.1
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