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From:   Johannes Zink <j.zink@pengutronix.de>
Date:   Tue, 16 May 2023 18:20:19 +0200
Subject: [PATCH v2 1/2] dt-bindings: phy: imx8mq-usb: add phy tuning
 properties
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Message-Id: <20230516-lustige-usb-phy-dinge-v2-1-3383a0de34ac@pengutronix.de>
References: <20230516-lustige-usb-phy-dinge-v2-0-3383a0de34ac@pengutronix.de>
In-Reply-To: <20230516-lustige-usb-phy-dinge-v2-0-3383a0de34ac@pengutronix.de>
To:     Vinod Koul <vkoul@kernel.org>,
        Kishon Vijay Abraham I <kishon@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>, Li Jun <jun.li@nxp.com>
Cc:     patchwork-jzi@pengutronix.de, linux-phy@lists.infradead.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, Johannes Zink <j.zink@pengutronix.de>
Precedence: bulk

Add optional properties for tuning of usb phy.

Signed-off-by: Johannes Zink <j.zink@pengutronix.de>
---
 .../bindings/phy/fsl,imx8mq-usb-phy.yaml           | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml b/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
index e6f9f5540cc3..dc3a3f709fea 100644
--- a/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
@@ -35,6 +35,53 @@ properties:
     description:
       A phandle to the regulator for USB VBUS.
 
+  fsl,phy-tx-vref-tune-percent:
+    description:
+      Tunes the HS DC level relative to the nominal level
+    minimum: 94
+    maximum: 124
+
+  fsl,phy-tx-rise-tune-percent:
+    description:
+      Adjusts the rise/fall time duration of the HS waveform relative to
+      its nominal value
+    minimum: 97
+    maximum: 103
+
+  fsl,phy-tx-preemp-amp-tune-microamp:
+    description:
+      Adjust amount of current sourced to DPn and DMn after a J-to-K
+      or K-to-J transition. Default is 0 (disabled).
+    minimum: 0
+    maximum: 1800
+
+  fsl,phy-tx-vboost-level-microvolt:
+    description:
+      Adjust the boosted transmit launch pk-pk differential amplitude
+    minimum: 880
+    maximum: 1120
+
+  fsl,phy-comp-dis-tune-percent:
+    description:
+      Adjust the voltage level used to detect a disconnect event at the host
+      relative to the nominal value
+    minimum: 91
+    maximum: 115
+
+  fsl,phy-pcs-tx-deemph-3p5db-attenuation-db:
+    description:
+      Adjust TX de-emphasis attenuation in dB at nominal
+      3.5dB point as per USB specification
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 36
+
+  fsl,phy-pcs-tx-swing-full-percent:
+    description:
+      Scaling of the voltage defined by fsl,phy-tx-vboost-level-microvolt
+    minimum: 0
+    maximum: 100
+
 required:
   - compatible
   - reg

-- 
2.39.2