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| author | Sven Van Asbroeck <thesven73@gmail.com> | 2018-12-17 10:47:58 -0500 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2019-01-11 15:16:28 +0800 |
| commit | 4c783b010467db8eadd65da40b26f566d0d4d5cb (patch) | |
| tree | 2ded5b48394a92f428b5a2e7aa0041d2437d8776 /Documentation/devicetree/bindings/bus | |
| parent | ae1d2add26a4a0d34dc0615d304be2f341202e77 (diff) | |
| download | linux-stable-4c783b010467db8eadd65da40b26f566d0d4d5cb.tar.gz linux-stable-4c783b010467db8eadd65da40b26f566d0d4d5cb.tar.bz2 linux-stable-4c783b010467db8eadd65da40b26f566d0d4d5cb.zip | |
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>
Diffstat (limited to 'Documentation/devicetree/bindings/bus')
| -rw-r--r-- | Documentation/devicetree/bindings/bus/imx-weim.txt | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/bus/imx-weim.txt b/Documentation/devicetree/bindings/bus/imx-weim.txt index 683eaf3aed79..dda7d6d66479 100644 --- 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>; + }; + }; |