Add two new device properties to program the reference clock period and
to enable low power management using the reference clock. This allows a
higher demand to go in low power for Audio Device Class devices. This
feature is currently only valid for DWC_usb31 peripheral controller
v1.80a and higher.
Set "snps,refclk-period-ns" to program the reference clock period. The
valid input periods are as follow:
+-------------+-----------------+
| Period (ns) | Freq (MHz) |
+-------------+-----------------+
| 25 | 39.7/40 |
| 41 | 24.4 |
| 50 | 20 |
| 52 | 19.2 |
| 58 | 17.2 |
| 62 | 16.1 |
+-------------+-----------------+
Set "snps,refclk-lpm" to enable low power scheduling of isochronous
transfers by running SOF/ITP counters using the reference clock. Both
"snps,dis_u2_susphy_quirk" and "snps,dis_enblslpm_quirk" must not be
set for this feature to be enabled.
Signed-off-by: Thinh Nguyen <thi...@synopsys.com>
---
Documentation/devicetree/bindings/usb/dwc3.txt | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt
b/Documentation/devicetree/bindings/usb/dwc3.txt
index 636630fb92d7..712b344c3a31 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -95,6 +95,24 @@ Optional properties:
this and tx-thr-num-pkt-prd to a valid, non-zero value
1-16 (DWC_usb31 programming guide section 1.2.3) to
enable periodic ESS TX threshold.
+ - snps,refclk-period-ns: set to program the reference clock period. The valid
+ input periods are as follow:
+ +-------------+-----------------+
+ | Period (ns) | Freq (MHz) |
+ +-------------+-----------------+
+ | 25 | 39.7/40 |
+ | 41 | 24.4 |
+ | 50 | 20 |
+ | 52 | 19.2 |
+ | 58 | 17.2 |
+ | 62 | 16.1 |
+ +-------------+-----------------+
+ - snps,enable-refclk-lpm: set to enable low power scheduling of isochronous
+ transfers by running SOF/ITP counters using the
+ reference clock. Only valid for DWC_usb31 peripheral
+ controller v1.80a and higher. Both
+ "snps,dis_u2_susphy_quirk" and
+ "snps,dis_enblslpm_quirk" must not be set.
- <DEPRECATED> tx-fifo-resize: determines if the FIFO *has* to be reallocated.
- snps,incr-burst-type-adjustment: Value for INCR burst type of GSBUSCFG0
--
2.11.0
