Introduce spi-bus-width property for bus subnodes, to
specify per-bus capability to use NORMAL, FAST, DUAL,
and/or QUAD reads.
Signed-off-by: Albert ARIBAUD (3ADEV) <albert.aribaud@xxxxxxxx>
---
Documentation/devicetree/bindings/mtd/fsl-quadspi.txt | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/Documentation/devicetree/bindings/mtd/fsl-quadspi.txt b/Documentation/devicetree/bindings/mtd/fsl-quadspi.txt
index c34aa6f..82e4eb8 100644
--- a/Documentation/devicetree/bindings/mtd/fsl-quadspi.txt
+++ b/Documentation/devicetree/bindings/mtd/fsl-quadspi.txt
@@ -24,6 +24,17 @@ Optional properties:
(Please check the board's schematic.)
- big-endian : That means the IP register is big endian
+Required subnode properties:
+ - spi-max-frequency: maximum operating frequency of the SPI device.
+ The controller will run at the lowest of all
+ specified frequencies (or at the default of 66 MHz).
+
+Optional subnode properties:
+ - spi-bus-width: if present, specifies how the decide should be read.
+ 1 specifies FAST read, 2 specifies DUAL read, and 4
+ specifies QUAD read.
+ If absent, normal (non-FAST) reads are used.
+
Example:
qspi0: quadspi@40044000 {
@@ -37,5 +48,12 @@ qspi0: quadspi@40044000 {
flash0: s25fl128s@0 {
....
+ spi-max-frequency = <66000000>;
+ spi-bus-width = <2>;
+ };
+ flash1: s25fl128s@1 {
+ ....
+ spi-max-frequency = <88000000>;
+ spi-bus-width = <4>;
};
};
--
2.9.3
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