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.c...@freescale.com>
---
Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
index d52a747..d71ef07 100644
--- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
+++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
@@ -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>;
};
--
1.9.1
--
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