linux-kernel - [v4 1/3] dt-bindings: phy: qcom,usb-snps-femto-v2: Add phy override params bindings

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Date:   Wed, 11 May 2022 20:56:31 +0530
From:   Krishna Kurapati <quic_kriskura@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Boyd <swboyd@...omium.org>,
        "Doug Anderson" <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        Vinod Koul <vkoul@...nel.org>
CC:     <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>, <quic_pkondeti@...cinc.com>,
        <quic_ppratap@...cinc.com>, <quic_vpulyala@...cinc.com>,
        Sandeep Maheswaram <quic_c_sanm@...cinc.com>,
        Krishna Kurapati <quic_kriskura@...cinc.com>
Subject: [v4 1/3] dt-bindings: phy: qcom,usb-snps-femto-v2: Add phy override params bindings

From: Sandeep Maheswaram <quic_c_sanm@...cinc.com>

Add device tree bindings for SNPS phy tuning parameters.

Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
---
 .../bindings/phy/qcom,usb-snps-femto-v2.yaml       | 87 ++++++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml b/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml
index 1ce251d..70efffe 100644
--- a/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml
+++ b/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml
@@ -53,6 +53,93 @@ properties:
   vdda33-supply:
     description: phandle to the regulator 3.3V supply node.
 
+  qcom,hs-disconnect-bps:
+    $ref: /schemas/types.yaml#/definitions/int32
+    description:
+      This adjusts the voltage level for the threshold used to
+      detect a disconnect event at the host. Possible values are.
+      The values defined are in multiples of basis points (1bp = 0.01%).
+      The hardware accepts only discrete values. The value closest to the
+      provided input will be chosen as the override value for this param.
+
+  qcom,squelch-detector-bps:
+    $ref: /schemas/types.yaml#/definitions/int32
+    description:
+      This adjusts the voltage level for the threshold used to
+      detect valid high-speed data.
+      The values defined are in multiples of basis points (1bp = 0.01%).
+      The hardware accepts only discrete values. The value closest to the
+      provided input will be chosen as the override value for this param.
+
+  qcom,hs-amplitude-bps:
+    $ref: /schemas/types.yaml#/definitions/int32
+    description:
+      This adjusts the high-speed DC level voltage.
+      The values defined are in multiples of basis points (1bp = 0.01%).
+      The hardware accepts only discrete values. The value closest to the
+      provided input will be chosen as the override value for this param.
+
+  qcom,pre-emphasis-duration-bps:
+    $ref: /schemas/types.yaml#/definitions/int32
+    description:
+      This signal controls the duration for which the
+      HS pre-emphasis current is sourced onto DP<#> or DM<#>.
+      The HS Transmitter pre-emphasis duration is defined in terms of
+      unit amounts. One unit of pre-emphasis duration is approximately
+      650 ps and is defined as 1X pre-emphasis duration.
+      The values defined are in multiples of basis points (1bp = 0.01%).
+      The hardware accepts only discrete values. The value closest to the
+      provided input will be chosen as the override value for this param.
+
+  qcom,pre-emphasis-amplitude-bps:
+    $ref: /schemas/types.yaml#/definitions/int32
+    description:
+      This signal controls the amount of current sourced to
+      DP<#> and DM<#> after a J-to-K or K-to-J transition.
+      The HS Transmitter pre-emphasis current is defined in terms of unit
+      amounts. One unit amount is approximately 2 mA and is defined as
+      1X pre-emphasis current.
+      The values defined are in multiples of basis points (1bp = 0.01%).
+      The hardware accepts only discrete values. The value closest to the
+      provided input will be chosen as the override value for this param.
+
+  qcom,hs-rise-fall-time-bps:
+    $ref: /schemas/types.yaml#/definitions/int32
+    description:
+      This adjusts the rise/fall times of the high-speed waveform.
+      The values defined are in multiples of basis points (1bp = 0.01%).
+      The hardware accepts only discrete values. The value closest to the
+      provided input will be chosen as the override value for this param.
+
+  qcom,hs-crossover-voltage-mv:
+    $ref: /schemas/types.yaml#/definitions/int32
+    description:
+      This adjusts the voltage at which the DP<#> and DM<#>
+      signals cross while transmitting in HS mode.
+      The values defined are in milli volts. The hardware accepts only
+      discrete values. The value closest to the provided input will be
+      chosen as the override value for this param.
+
+  qcom,hs-output-impedance-mohm:
+    $ref: /schemas/types.yaml#/definitions/int32
+    description:
+      In some applications, there can be significant series resistance
+      on the D+ and D- paths between the transceiver and cable. This adjusts
+      the driver source impedance to compensate for added series
+      resistance on the USB. The values defined are in milli ohms.
+      The hardware accepts only discrete values. The value closest to the
+      provided input will be chosen as the override value for this param.
+
+  qcom,ls-fs-output-impedance-bps:
+    $ref: /schemas/types.yaml#/definitions/int32
+    description:
+      This adjusts the low- and full-speed single-ended source
+      impedance while driving high. The following adjustment values are based
+      on nominal process, voltage, and temperature.
+      The values defined are in multiples of basis points (1bp = 0.01%).
+      The hardware accepts only discrete values. The value closest to the
+      provided input will be chosen as the override value for this param.
+
 required:
   - compatible
   - reg
-- 
2.7.4