1Device tree bindings for i.MX Wireless External Interface Module (WEIM)
2
3The term "wireless" does not imply that the WEIM is literally an interface
4without wires. It simply means that this module was originally designed for
5wireless and mobile applications that use low-power technology.
6
7The actual devices are instantiated from the child nodes of a WEIM node.
8
9Required properties:
10
11 - compatible:		Should be set to "fsl,<soc>-weim"
12 - reg:			A resource specifier for the register space
13			(see the example below)
14 - clocks:		the clock, see the example below.
15 - #address-cells:	Must be set to 2 to allow memory address translation
16 - #size-cells:		Must be set to 1 to allow CS address passing
17 - ranges:		Must be set up to reflect the memory layout with four
18			integer values for each chip-select line in use:
19
20			   <cs-number> 0 <physical address of mapping> <size>
21
22Timing property for child nodes. It is mandatory, not optional.
23
24 - fsl,weim-cs-timing:	The timing array, contains timing values for the
25			child node. We can get the CS index from the child
26			node's "reg" property. The number of registers depends
27			on the selected chip.
28			For i.MX1, i.MX21 ("fsl,imx1-weim") there are two
29			registers: CSxU, CSxL.
30			For i.MX25, i.MX27, i.MX31 and i.MX35 ("fsl,imx27-weim")
31			there are three registers: CSCRxU, CSCRxL, CSCRxA.
32			For i.MX50, i.MX53 ("fsl,imx50-weim"),
33			i.MX51 ("fsl,imx51-weim") and i.MX6Q ("fsl,imx6q-weim")
34			there are six registers: CSxGCR1, CSxGCR2, CSxRCR1,
35			CSxRCR2, CSxWCR1, CSxWCR2.
36
37Example for an imx6q-sabreauto board, the NOR flash connected to the WEIM:
38
39	weim: weim@021b8000 {
40		compatible = "fsl,imx6q-weim";
41		reg = <0x021b8000 0x4000>;
42		clocks = <&clks 196>;
43		#address-cells = <2>;
44		#size-cells = <1>;
45		ranges = <0 0 0x08000000 0x08000000>;
46
47		nor@0,0 {
48			compatible = "cfi-flash";
49			reg = <0 0 0x02000000>;
50			#address-cells = <1>;
51			#size-cells = <1>;
52			bank-width = <2>;
53			fsl,weim-cs-timing = <0x00620081 0x00000001 0x1c022000
54					0x0000c000 0x1404a38e 0x00000000>;
55		};
56	};
57