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From:   Naresh Solanki <naresh.solanki@9elements.com>
To:     Guenter Roeck <linux@roeck-us.net>,
        Jean Delvare <jdelvare@suse.com>,
        krzysztof.kozlowski+dt@linaro.org,
        Rob Herring <robh+dt@kernel.org>,
        Conor Dooley <conor+dt@kernel.org>
Cc:     linux-hwmon@vger.kernel.org,
        Patrick Rudolph <patrick.rudolph@9elements.com>,
        Naresh Solanki <Naresh.Solanki@9elements.com>,
        Rob Herring <robh@kernel.org>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 1/3] dt-bindings: hwmon: Add Infineon TDA38640
Date:   Tue, 25 Jul 2023 13:40:26 +0200
Message-ID: <20230725114030.1860571-1-Naresh.Solanki@9elements.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
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From: Patrick Rudolph <patrick.rudolph@9elements.com>

The TDA38640 has a bug in SVID mode and to enable a workaround
remove the TDA38640 from trivial-devices and add a complete schema.

The schema adds the custom property 'infineon,en-pin-fixed-level' to
signal a fixed level on the ENABLE pin and to enable the workaround.
When the ENABLE pin is left floating it's internally pulled low.

If not specified the driver will continue to use the PMBUS_OPERATION
register to enable the regulator. When specified the driver will use
the PMBUS_ON_OFF_CONFIG register to enable the regulator.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
---
 .../hwmon/pmbus/infineon,tda38640.yaml        | 50 +++++++++++++++++++
 .../devicetree/bindings/trivial-devices.yaml  |  2 -
 2 files changed, 50 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml
new file mode 100644
index 000000000000..520112e4e271
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/hwmon/pmbus/infineon,tda38640.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Infineon TDA38640 Synchronous Buck Regulator with SVID and I2C
+
+description: |
+  The Infineon TDA38640 is a 40A Single-voltage Synchronous Buck
+  Regulator with SVID and I2C designed for Industrial use.
+
+  Datasheet: https://www.infineon.com/dgdl/Infineon-TDA38640-0000-DataSheet-v02_04-EN.pdf?fileId=8ac78c8c80027ecd018042f2337f00c9
+
+properties:
+  compatible:
+    enum:
+      - infineon,tda38640
+
+  reg:
+    maxItems: 1
+
+  infineon,en-pin-fixed-level:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      Fixed level of the ENABLE pin. When specified the PMBUS_ON_OFF_CONFIG
+      register is used to enable the regulator instead of the PMBUS_OPERATION
+      register to workaround a bug of the tda38640 when operating in SVID-mode.
+      If the ENABLE pin is left floating the internal pull-down causes a low
+      level on the pin.
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        tda38640@40 {
+            compatible = "infineon,tda38640";
+            reg = <0x40>;
+        };
+    };
+
diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
index 6e24c4d25ec3..2b1fbb2a672b 100644
--- a/Documentation/devicetree/bindings/trivial-devices.yaml
+++ b/Documentation/devicetree/bindings/trivial-devices.yaml
@@ -151,8 +151,6 @@ properties:
           - infineon,slb9645tt
             # Infineon SLB9673 I2C TPM 2.0
           - infineon,slb9673
-            # Infineon TDA38640 Voltage Regulator
-          - infineon,tda38640
             # Infineon TLV493D-A1B6 I2C 3D Magnetic Sensor
           - infineon,tlv493d-a1b6
             # Infineon Multi-phase Digital VR Controller xdpe11280

base-commit: 55612007f16b5d7b1fb83a7b0f5bb686829db7c7
-- 
2.41.0