[PATCH v3 08/10] Doc: usb: ci-hdrc-usb2: add tx(rx)-burst-config-dword for binding doc
From: Peter Chen <hidden>
Date: 2015-08-07 07:15:45
Also in:
linux-devicetree
Subsystem:
open firmware and flattened device tree bindings, the rest, usb subsystem · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds, Greg Kroah-Hartman
Possibly related (same subject, not in this thread)
- 2015-10-08 · Re: [PATCH v3 08/10] Doc: usb: ci-hdrc-usb2: add tx(rx)-burst-config-dword for binding doc · Peter Chen <hidden>
- 2015-08-14 · Re: [PATCH v3 08/10] Doc: usb: ci-hdrc-usb2: add tx(rx)-burst-config-dword for binding doc · Lucas Stach <hidden>
- 2015-08-14 · Re: [PATCH v3 08/10] Doc: usb: ci-hdrc-usb2: add tx(rx)-burst-config-dword for binding doc · Peter Chen <hidden>
- 2015-08-14 · Re: [PATCH v3 08/10] Doc: usb: ci-hdrc-usb2: add tx(rx)-burst-config-dword for binding doc · Lucas Stach <hidden>
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 <redacted> --- 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