linux-kernel - [PATCH] dt-bindings: phy: qcom-qusb2: Fix defaults

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Message-Id: <20200423111015.1.Ifa8039b6f3031e9a69c4a526a6efc2f499f07292@changeid>
Date:   Thu, 23 Apr 2020 11:10:27 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Sandeep Maheswaram <sanm@...eaurora.org>, mka@...omium.org,
        Manu Gautam <mgautam@...eaurora.org>,
        linux-arm-msm@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: phy: qcom-qusb2: Fix defaults

The defaults listed in the bindings don't match what the code is
actually doing.  Presumably existing users care more about keeping
existing behavior the same, so change the bindings to match the code
in Linux.

The "qcom,preemphasis-level" default has been wrong for quite a long
time (May 2018).  The other two were recently added.

As some evidence that these values are wrong, this is from the Linux
driver:
- qcom,preemphasis-level: sets "PORT_TUNE1", lower 2 bits.  Driver
  programs PORT_TUNE1 to 0x30 by default and (0x30 & 0x3) = 0.
- qcom,bias-ctrl-value: sets "PLL_BIAS_CONTROL_2", lower 6 bits.
  Driver programs PLL_BIAS_CONTROL_2 to 0x20 by default and (0x20 &
  0x3f) = 0x20 = 32.
- qcom,hsdisc-trim-value: sets "PORT_TUNE2", lower 2 bits.  Driver
  programs PORT_TUNE2 to 0x29 by default and (0x29 & 0x3) = 1.

Fixes: 1e6f134eb67a ("dt-bindings: phy: qcom-qusb2: Add support for overriding Phy tuning parameters")
Fixes: a8b70ccf10e3 ("dt-bindings: phy-qcom-usb2: Add support to override tuning values")
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

 Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml
index 144ae29e7141..f8bd28ff31c1 100644
--- a/Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml
@@ -97,7 +97,7 @@ then:
         - $ref: /schemas/types.yaml#/definitions/uint32
         - minimum: 0
           maximum: 63
-          default: 0
+          default: 32
 
     qcom,charge-ctrl-value:
      description:
@@ -130,7 +130,7 @@ then:
         - $ref: /schemas/types.yaml#/definitions/uint32
         - minimum: 0
           maximum: 3
-          default: 2
+          default: 0
 
     qcom,preemphasis-width:
       description:
@@ -152,7 +152,7 @@ then:
         - $ref: /schemas/types.yaml#/definitions/uint32
         - minimum: 0
           maximum: 3
-          default: 0
+          default: 1
 
 required:
   - compatible
-- 
2.26.1.301.g55bc3eb7cb9-goog