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authorHuang Shijie <b32955@freescale.com>2013-05-28 06:20:07 (GMT)
committerShawn Guo <shawn.guo@linaro.org>2013-06-17 08:04:28 (GMT)
commit85bf6d4e4b100efda8169f6f98fd65d0029c7813 (patch)
tree56c0bf6af6b3f4877af7e1b560247e7f4cb1c75c /Documentation/devicetree/bindings/bus
parent81b8a3cda99076b7d8b65e63d3cc675a305f60e1 (diff)
drivers: bus: add a new driver for WEIM
The WEIM(Wireless External Interface Module) works like a bus. You can attach many different devices on it, such as NOR, onenand. In the case of i.MX6q-sabreauto, the NOR is connected to WEIM. This patch also adds the devicetree binding document. The driver only works when the devicetree is enabled. Signed-off-by: Huang Shijie <b32955@freescale.com> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/bus')
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diff --git a/Documentation/devicetree/bindings/bus/imx-weim.txt b/Documentation/devicetree/bindings/bus/imx-weim.txt
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+Device tree bindings for i.MX Wireless External Interface Module (WEIM)
+
+The term "wireless" does not imply that the WEIM is literally an interface
+without wires. It simply means that this module was originally designed for
+wireless and mobile applications that use low-power technology.
+
+The actual devices are instantiated from the child nodes of a WEIM node.
+
+Required properties:
+
+ - compatible: Should be set to "fsl,imx6q-weim"
+ - reg: A resource specifier for the register space
+ (see the example below)
+ - clocks: the clock, see the example below.
+ - #address-cells: Must be set to 2 to allow memory address translation
+ - #size-cells: Must be set to 1 to allow CS address passing
+ - ranges: Must be set up to reflect the memory layout with four
+ integer values for each chip-select line in use:
+
+ <cs-number> 0 <physical address of mapping> <size>
+
+Timing property for child nodes. It is mandatory, not optional.
+
+ - fsl,weim-cs-timing: The timing array, contains 6 timing values for the
+ child node. We can get the CS index from the child
+ node's "reg" property. This property contains the values
+ for the registers EIM_CSnGCR1, EIM_CSnGCR2, EIM_CSnRCR1,
+ EIM_CSnRCR2, EIM_CSnWCR1, EIM_CSnWCR2 in this order.
+
+Example for an imx6q-sabreauto board, the NOR flash connected to the WEIM:
+
+ weim: weim@021b8000 {
+ compatible = "fsl,imx6q-weim";
+ reg = <0x021b8000 0x4000>;
+ clocks = <&clks 196>;
+ #address-cells = <2>;
+ #size-cells = <1>;
+ ranges = <0 0 0x08000000 0x08000000>;
+
+ nor@0,0 {
+ compatible = "cfi-flash";
+ reg = <0 0 0x02000000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ bank-width = <2>;
+ fsl,weim-cs-timing = <0x00620081 0x00000001 0x1c022000
+ 0x0000c000 0x1404a38e 0x00000000>;
+ };
+ };

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