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Commit bd6e9d11 authored by Peter Chen's avatar Peter Chen
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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: default avatarPeter Chen <peter.chen@freescale.com>
parent ed6e5eb5

Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt

+10 −0
Original line number Original line Diff line number Diff line
@@ -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>;

	};
 
	};