Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit bd6e9d11 authored by Peter Chen's avatar Peter Chen
Browse files

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 Diff line number Diff line
@@ -37,6 +37,14 @@ Optional properties: 
  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.

- 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:
@@ -51,4 +59,6 @@ Example: 
		gadget-itc-setting = <0x4>; /* 4 micro-frames */

		 /* Incremental burst of unspecified length */

		ahb-burst-config = <0x0>;

		tx-burst-size-dword = <0x10>; /* 64 bytes */

		rx-burst-size-dword = <0x10>;

	};