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From: Robert Hancock <robert.hancock@calian.com>
To: linux-usb@vger.kernel.org
Cc: Thinh.Nguyen@synopsys.com, robh+dt@kernel.org,
	devicetree@vger.kernel.org, michal.simek@xilinx.com,
	balbi@kernel.org, gregkh@linuxfoundation.org,
	mounika.grace.akula@xilinx.com, manish.narani@xilinx.com,
	Robert Hancock <robert.hancock@calian.com>
Subject: [PATCH v4 3/5] dt-bindings: usb: dwc3: add reference clock period fractional adjustment
Date: Thu, 13 Jan 2022 22:42:28 -0600	[thread overview]
Message-ID: <20220114044230.2677283-4-robert.hancock@calian.com> (raw)
In-Reply-To: <20220114044230.2677283-1-robert.hancock@calian.com>

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>
---
 .../devicetree/bindings/usb/snps,dwc3.yaml          | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index d29ffcd27472..5872a4470b16 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -266,6 +266,19 @@ 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.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 124999
+
   snps,rx-thr-num-pkt-prd:
     description:
       Periodic ESS RX packet threshold count (host mode only). Set this and
-- 
2.31.1


  parent reply	other threads:[~2022-01-14  4:43 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-14  4:42 [PATCH v4 0/5] Xilinx ZynqMP USB fixes Robert Hancock
2022-01-14  4:42 ` [PATCH v4 1/5] usb: dwc3: xilinx: Fix PIPE clock selection for USB2.0 mode Robert Hancock
2022-01-14  4:42 ` [PATCH v4 2/5] usb: dwc3: xilinx: Fix error handling when getting USB3 PHY Robert Hancock
2022-01-14  4:42 ` Robert Hancock [this message]
2022-01-14  4:42 ` [PATCH v4 4/5] usb: dwc3: add reference clock FLADJ configuration Robert Hancock
2022-01-14 18:05   ` Sean Anderson
2022-01-14 19:22     ` Robert Hancock
2022-01-14 19:56       ` Sean Anderson
2022-01-14  4:42 ` [PATCH v4 5/5] arm64: dts: zynqmp: Add DWC3 USB reference clock period configuration Robert Hancock

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