redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

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

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

10
Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
View file

@ -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>;
};