83 lines
2.9 KiB
Plaintext
83 lines
2.9 KiB
Plaintext
|
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 contain one of the following:
|
||
|
|
"fsl,imx1-weim"
|
||
|
|
"fsl,imx27-weim"
|
||
|
|
"fsl,imx51-weim"
|
||
|
|
"fsl,imx50-weim"
|
||
|
|
"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>
|
||
|
|
|
||
|
|
Optional properties:
|
||
|
|
|
||
|
|
- fsl,weim-cs-gpr: For "fsl,imx50-weim" and "fsl,imx6q-weim" type of
|
||
|
|
devices, it should be the phandle to the system General
|
||
|
|
Purpose Register controller that contains WEIM CS GPR
|
||
|
|
register, e.g. IOMUXC_GPR1 on i.MX6Q. IOMUXC_GPR1[11:0]
|
||
|
|
should be set up as one of the following 4 possible
|
||
|
|
values depending on the CS space configuration.
|
||
|
|
|
||
|
|
IOMUXC_GPR1[11:0] CS0 CS1 CS2 CS3
|
||
|
|
---------------------------------------------
|
||
|
|
05 128M 0M 0M 0M
|
||
|
|
033 64M 64M 0M 0M
|
||
|
|
0113 64M 32M 32M 0M
|
||
|
|
01111 32M 32M 32M 32M
|
||
|
|
|
||
|
|
In case that the property is absent, the reset value or
|
||
|
|
what bootloader sets up in IOMUXC_GPR1[11:0] will be
|
||
|
|
used.
|
||
|
|
|
||
|
|
Timing property for child nodes. It is mandatory, not optional.
|
||
|
|
|
||
|
|
- fsl,weim-cs-timing: The timing array, contains timing values for the
|
||
|
|
child node. We can get the CS index from the child
|
||
|
|
node's "reg" property. The number of registers depends
|
||
|
|
on the selected chip.
|
||
|
|
For i.MX1, i.MX21 ("fsl,imx1-weim") there are two
|
||
|
|
registers: CSxU, CSxL.
|
||
|
|
For i.MX25, i.MX27, i.MX31 and i.MX35 ("fsl,imx27-weim")
|
||
|
|
there are three registers: CSCRxU, CSCRxL, CSCRxA.
|
||
|
|
For i.MX50, i.MX53 ("fsl,imx50-weim"),
|
||
|
|
i.MX51 ("fsl,imx51-weim") and i.MX6Q ("fsl,imx6q-weim")
|
||
|
|
there are six registers: CSxGCR1, CSxGCR2, CSxRCR1,
|
||
|
|
CSxRCR2, CSxWCR1, CSxWCR2.
|
||
|
|
|
||
|
|
Example for an imx6q-sabreauto board, the NOR flash connected to the WEIM:
|
||
|
|
|
||
|
|
weim: weim@21b8000 {
|
||
|
|
compatible = "fsl,imx6q-weim";
|
||
|
|
reg = <0x021b8000 0x4000>;
|
||
|
|
clocks = <&clks 196>;
|
||
|
|
#address-cells = <2>;
|
||
|
|
#size-cells = <1>;
|
||
|
|
ranges = <0 0 0x08000000 0x08000000>;
|
||
|
|
fsl,weim-cs-gpr = <&gpr>;
|
||
|
|
|
||
|
|
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>;
|
||
|
|
};
|
||
|
|
};
|