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Message-ID: <20250714202843.3011698-1-robh@kernel.org>
Date: Mon, 14 Jul 2025 15:28:41 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Lukas Wunner <lukas@...ner.de>
Cc: linux-gpio@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: gpio: Convert maxim,max3191x to DT schema
Convert the Maxim MAX3191x and similar GPIO binding to DT schema format.
It's a straight forward conversion.
Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
.../bindings/gpio/gpio-max3191x.txt | 59 ----------
.../bindings/gpio/maxim,max31910.yaml | 104 ++++++++++++++++++
2 files changed, 104 insertions(+), 59 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/gpio/gpio-max3191x.txt
create mode 100644 Documentation/devicetree/bindings/gpio/maxim,max31910.yaml
diff --git a/Documentation/devicetree/bindings/gpio/gpio-max3191x.txt b/Documentation/devicetree/bindings/gpio/gpio-max3191x.txt
deleted file mode 100644
index b3a6444b8f45..000000000000
--- a/Documentation/devicetree/bindings/gpio/gpio-max3191x.txt
+++ /dev/null
@@ -1,59 +0,0 @@
-GPIO driver for Maxim MAX3191x industrial serializer
-
-Required properties:
- - compatible: Must be one of:
- "maxim,max31910"
- "maxim,max31911"
- "maxim,max31912"
- "maxim,max31913"
- "maxim,max31953"
- "maxim,max31963"
- - reg: Chip select number.
- - gpio-controller: Marks the device node as a GPIO controller.
- - #gpio-cells: Should be two. For consumer use see gpio.txt.
-
-Optional properties:
- - #daisy-chained-devices:
- Number of chips in the daisy-chain (default is 1).
- - maxim,modesel-gpios: GPIO pins to configure modesel of each chip.
- The number of GPIOs must equal "#daisy-chained-devices"
- (if each chip is driven by a separate pin) or 1
- (if all chips are wired to the same pin).
- - maxim,fault-gpios: GPIO pins to read fault of each chip.
- The number of GPIOs must equal "#daisy-chained-devices"
- or 1.
- - maxim,db0-gpios: GPIO pins to configure debounce of each chip.
- The number of GPIOs must equal "#daisy-chained-devices"
- or 1.
- - maxim,db1-gpios: GPIO pins to configure debounce of each chip.
- The number of GPIOs must equal "maxim,db0-gpios".
- - maxim,modesel-8bit: Boolean whether the modesel pin of the chips is
- pulled high (8-bit mode). Use this if the modesel pin
- is hardwired and consequently "maxim,modesel-gpios"
- cannot be specified. By default if neither this nor
- "maxim,modesel-gpios" is given, the driver assumes
- that modesel is pulled low (16-bit mode).
- - maxim,ignore-undervoltage:
- Boolean whether to ignore undervoltage alarms signaled
- by the "maxim,fault-gpios" or by the status byte
- (in 16-bit mode). Use this if the chips are powered
- through 5VOUT instead of VCC24V, in which case they
- will constantly signal undervoltage.
-
-For other required and optional properties of SPI slave nodes please refer to
-../spi/spi-bus.txt.
-
-Example:
- gpio@0 {
- compatible = "maxim,max31913";
- reg = <0>;
- gpio-controller;
- #gpio-cells = <2>;
-
- maxim,modesel-gpios = <&gpio2 23>;
- maxim,fault-gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
- maxim,db0-gpios = <&gpio2 25>;
- maxim,db1-gpios = <&gpio2 26>;
-
- spi-max-frequency = <25000000>;
- };
diff --git a/Documentation/devicetree/bindings/gpio/maxim,max31910.yaml b/Documentation/devicetree/bindings/gpio/maxim,max31910.yaml
new file mode 100644
index 000000000000..82a190a715f9
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/maxim,max31910.yaml
@@ -0,0 +1,104 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/maxim,max31910.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim MAX3191x GPIO serializer
+
+maintainers:
+ - Lukas Wunner <lukas@...ner.de>
+
+properties:
+ compatible:
+ enum:
+ - maxim,max31910
+ - maxim,max31911
+ - maxim,max31912
+ - maxim,max31913
+ - maxim,max31953
+ - maxim,max31963
+
+ reg:
+ maxItems: 1
+
+ gpio-controller: true
+
+ '#gpio-cells':
+ const: 2
+
+ '#daisy-chained-devices':
+ description: Number of chips in the daisy-chain.
+ default: 1
+
+ maxim,modesel-gpios:
+ description:
+ GPIO pins to configure modesel of each chip. The number of GPIOs must
+ equal "#daisy-chained-devices" (if each chip is driven by a separate pin)
+ or 1 (if all chips are wired to the same pin).
+
+ maxim,fault-gpios:
+ description:
+ GPIO pins to read fault of each chip. The number of GPIOs must equal
+ "#daisy-chained-devices" or 1.
+
+ maxim,db0-gpios:
+ description:
+ GPIO pins to configure debounce of each chip. The number of GPIOs must
+ equal "#daisy-chained-devices" or 1.
+
+ maxim,db1-gpios:
+ description:
+ GPIO pins to configure debounce of each chip. The number of GPIOs must
+ equal "maxim,db0-gpios".
+
+ maxim,modesel-8bit:
+ description:
+ Boolean whether the modesel pin of the chips is pulled high (8-bit mode).
+ Use this if the modesel pin is hardwired and consequently
+ "maxim,modesel-gpios" cannot be specified. By default if neither this nor
+ "maxim,modesel-gpios" is given, the driver assumes that modesel is pulled
+ low (16-bit mode).
+ type: boolean
+
+ maxim,ignore-undervoltage:
+ description:
+ Boolean whether to ignore undervoltage alarms signaled by the
+ "maxim,fault-gpios" or by the status byte (in 16-bit mode). Use this if
+ the chips are powered through 5VOUT instead of VCC24V, in which case they
+ will constantly signal undervoltage.
+ type: boolean
+
+required:
+ - compatible
+ - reg
+ - gpio-controller
+ - '#gpio-cells'
+
+allOf:
+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ gpio@0 {
+ compatible = "maxim,max31913";
+ reg = <0>;
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ maxim,modesel-gpios = <&gpio2 23>;
+ maxim,fault-gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
+ maxim,db0-gpios = <&gpio2 25>;
+ maxim,db1-gpios = <&gpio2 26>;
+
+ spi-max-frequency = <25000000>;
+ };
+ };
--
2.47.2
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