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Doc: usb: ci-hdrc-usb2: add ahb-burst-config for binding doc

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It is used to change ahb burst configuration for platforms, it is
vendor specific.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
This commit is contained in:
Peter Chen 2015-07-28 13:33:15 +08:00
parent 0ef877a408
commit c6fba7b750
1 changed files with 7 additions and 0 deletions
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7
Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
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@ -32,6 +32,11 @@ Optional properties:
- external-vbus-divider: (FSL only) enables off-chip resistor divider for Vbus
- itc-setting: interrupt threshold control register control, the setting
should be aligned with ITC bits at register USBCMD.
- ahb-burst-config: it is vendor dependent, the required value should be
aligned with AHBBRST at SBUSCFG, the range is from 0x0 to 0x7. This
property is used to change AHB burst configuration, check the chipidea
spec for meaning of each value. If this property is not existed, it
will use the reset value.
Example:
@ -44,4 +49,6 @@ Example:
phy-names = "usb-phy";
vbus-supply = <&reg_usb0_vbus>;
gadget-itc-setting = <0x4>; /* 4 micro-frames */
/* Incremental burst of unspecified length */
ahb-burst-config = <0x0>;
};