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[v2,3/5] dt-bindings: usb: dwc3: add reference clock period fractional adjustment

Message ID 20220110193641.1368350-4-robert.hancock@calian.com
State Superseded
Headers show
Series [v2,1/5] usb: dwc3: xilinx: Fix PIPE clock selection for USB2.0 mode | expand

Commit Message

Robert Hancock Jan. 10, 2022, 7:36 p.m. UTC 
Document the new snps,ref-clock-fladj property which can be used to set
the fractional portion of the reference clock period.

Signed-off-by: Robert Hancock <robert.hancock@calian.com>
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 25ac2c93dc6c..88d8d831e04a 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -260,6 +260,18 @@  properties:
     minimum: 1
     maximum: 0x3ff
 
+  snps,ref-clock-fladj:
+    description:
+      Value for GFLADJ_REFCLK_FLADJ field of GFLADJ register for the
+      fractional portion of the reference clock period in nanoseconds,
+      when the hardware set default does not match the actual
+      clock. Calculated via
+      ((125000/ref_clk_period_integer)-(125000/ref_clk_period)) * ref_clk_period
+      where ref_clk_period_integer is the period specified in GUCTL_REFCLKPER and
+      ref_clk_period is the period including fractional value.
+    minimum: 0
+    maximum: 124999
+
   snps,rx-thr-num-pkt-prd:
     description:
       Periodic ESS RX packet threshold count (host mode only). Set this and