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Doc: usb: ci-hdrc-usb2: add tx(rx)-burst-config-dword for binding doc 

It is used to override the default setting for burst size, changing
burst size takes effect only when the SBUSCFG.AHBBRST = 0.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
This commit is contained in:
Peter Chen 2015-08-07 15:08:02 +08:00
parent ed6e5eb50f
commit bd6e9d115d
1 changed files with 10 additions and 0 deletions
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10
Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
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@ -37,6 +37,14 @@ Optional properties:
property is used to change AHB burst configuration, check the chipidea property is used to change AHB burst configuration, check the chipidea
spec for meaning of each value. If this property is not existed, it spec for meaning of each value. If this property is not existed, it
will use the reset value. will use the reset value.
- tx-burst-size-dword: it is vendor dependent, the tx burst size in dword
(4 bytes), This register represents the maximum length of a the burst
in 32-bit words while moving data from system memory to the USB
bus, changing this value takes effect only the SBUSCFG.AHBBRST is 0.
- rx-burst-size-dword: it is vendor dependent, the rx burst size in dword
(4 bytes), This register represents the maximum length of a the burst
in 32-bit words while moving data from the USB bus to system memory,
changing this value takes effect only the SBUSCFG.AHBBRST is 0.
Example: Example:
@ -51,4 +59,6 @@ Example:
gadget-itc-setting = <0x4>; /* 4 micro-frames */ gadget-itc-setting = <0x4>; /* 4 micro-frames */
/* Incremental burst of unspecified length */ /* Incremental burst of unspecified length */
ahb-burst-config = <0x0>; ahb-burst-config = <0x0>;
tx-burst-size-dword = <0x10>; /* 64 bytes */
rx-burst-size-dword = <0x10>;
}; };