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| author | Huang Rui <ray.huang@amd.com> | 2014-10-31 06:11:12 +0300 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2014-11-03 19:03:39 +0300 |
| commit | 6b6a0c9a3ffa3107994d92d5758cbe274c5a97b6 (patch) | |
| tree | 766305f952fc54d7c68793f3fd469cdbc65f0791 /Documentation | |
| parent | 2164a476205ccc62c5874f95f3504b657fff5c04 (diff) | |
| download | linux-6b6a0c9a3ffa3107994d92d5758cbe274c5a97b6.tar.xz | |
usb: dwc3: add Tx de-emphasis quirk
This patch adds Tx de-emphasis quirk, and the Tx de-emphasis value is
configurable according to PIPE3 specification.
Value Description
0 -6dB de-emphasis
1 -3.5dB de-emphasis
2 No de-emphasis
3 Reserved
It can be configured on DT or platform data.
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/usb/dwc3.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt index 1ecc33315e1f..b724b2e78549 100644 --- a/Documentation/devicetree/bindings/usb/dwc3.txt +++ b/Documentation/devicetree/bindings/usb/dwc3.txt @@ -29,6 +29,9 @@ Optional properties: - snps,lfps_filter_quirk: when set core will filter LFPS reception. - snps,rx_detect_poll_quirk: when set core will disable a 400us delay to start Polling LFPS after RX.Detect. + - snps,tx_de_emphasis_quirk: when set core will set Tx de-emphasis value. + - snps,tx_de_emphasis: the value driven to the PHY is controlled by the + LTSSM during USB3 Compliance mode. This is usually a subnode to DWC3 glue to which it is connected. |