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dt-bindings: bus: imx-weim: document multiple address ranges per child node

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The imx-weim driver was patched to allow correct WEIM configuration
when multiple address ranges are used in a child node.
Update the dt-bindings to reflect this.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sven Van Asbroeck <TheSven73@googlemail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Sven Van Asbroeck 2018-12-17 10:47:58 -05:00 committed by Shawn Guo
parent ae1d2add26
commit 4c783b0104
1 changed files with 29 additions and 3 deletions
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32
Documentation/devicetree/bindings/bus/imx-weim.txt
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@ -47,9 +47,9 @@ Optional properties:
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.
child node. We get the CS indexes from the address
ranges in 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")
@ -80,3 +80,29 @@ Example for an imx6q-sabreauto board, the NOR flash connected to the WEIM:
0x0000c000 0x1404a38e 0x00000000>;
};
};
Example for an imx6q-based board, a multi-chipselect device connected to WEIM:
In this case, both chip select 0 and 1 will be configured with the same timing
array values.
weim: weim@21b8000 {
compatible = "fsl,imx6q-weim";
reg = <0x021b8000 0x4000>;
clocks = <&clks 196>;
#address-cells = <2>;
#size-cells = <1>;
ranges = <0 0 0x08000000 0x02000000
1 0 0x0a000000 0x02000000
2 0 0x0c000000 0x02000000
3 0 0x0e000000 0x02000000>;
fsl,weim-cs-gpr = <&gpr>;
acme@0 {
compatible = "acme,whatever";
reg = <0 0 0x100>, <0 0x400000 0x800>,
<1 0x400000 0x800>;
fsl,weim-cs-timing = <0x024400b1 0x00001010 0x20081100
0x00000000 0xa0000240 0x00000000>;
};
};