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

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>

diff --git a/Documentation/devicetree/bindings/bus/imx-weim.txt b/Documentation/devicetree/bindings/bus/imx-weim.txt
index 683eaf3aed795c74a72348c6eee9ed924553c1e8..dda7d6d6647987fc0ef46ad38dd6b1de4c44c9d5 100644 (file)
--- a/Documentation/devicetree/bindings/bus/imx-weim.txt
+++ b/Documentation/devicetree/bindings/bus/imx-weim.txt
@@ -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>;
+               };
+       };