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dt-bindings: max3421: Add bindings documentation 

Adds bindings documentation for the max3421 driver.

Signed-off-by: Jules Maselbas <jules.maselbas@grenoble-inp.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jules Maselbas 2017-09-15 18:58:46 +02:00 committed by Greg Kroah-Hartman
parent 721fdc83b3
commit 06e5e0045a
1 changed files with 24 additions and 0 deletions
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Documentation/devicetree/bindings/usb/maxim,max3421.txt Normal file
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Maxim Integrated SPI-based USB 2.0 host controller MAX3421E
Required properties:
- compatible: "maxim,max3421"
- spi-max-frequency: maximum frequency for this device must not exceed 26 MHz.
- reg: chip select number to which this device is connected.
- maxim,vbus-en-pin: <GPOUTx ACTIVE_LEVEL>
GPOUTx is the number (1-8) of the GPOUT pin of MAX3421E to drive Vbus.
ACTIVE_LEVEL is 0 or 1.
- interrupt-parent: the phandle of the associated interrupt controller.
- interrupts: the interuption line description for the interrupt controller.
The driver configures MAX3421E for active low level triggered interrupts,
configure your interrupt line accordingly.
Example:
usb@0 {
compatible = "maxim,max3421";
reg = <0>;
maxim,vbus-en-pin = <3 1>;
spi-max-frequency = <26000000>;
interrupt-parent = <&PIC>;
interrupts = <42>;
};