linux-kernel - [PATCH v3 1/2] dt-bindings: i2c: add binding for i2c-hotplug-gpio

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Message-Id: <20230729160857.6332-2-clamor95@gmail.com>
Date:   Sat, 29 Jul 2023 19:08:56 +0300
From:   Svyatoslav Ryhel <clamor95@...il.com>
To:     Andi Shyti <andi.shyti@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Wolfram Sang <wsa@...nel.org>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Svyatoslav Ryhel <clamor95@...il.com>
Cc:     linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/2] dt-bindings: i2c: add binding for i2c-hotplug-gpio

Document device tree schema which describes hot-pluggable via GPIO
i2c bus.

Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
---
 .../bindings/i2c/i2c-hotplug-gpio.yaml        | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/i2c-hotplug-gpio.yaml

diff --git a/Documentation/devicetree/bindings/i2c/i2c-hotplug-gpio.yaml b/Documentation/devicetree/bindings/i2c/i2c-hotplug-gpio.yaml
new file mode 100644
index 000000000000..21f2b74ca6c1
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-hotplug-gpio.yaml
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/i2c-hotplug-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO detected hot-plugged I2C bus
+
+maintainers:
+  - Michał Mirosław <mirq-linux@...e.qmqm.pl>
+
+description:
+  Driver for hot-plugged I2C busses, where some devices on a bus
+  are hot-pluggable and their presence is indicated by GPIO line.
+
+properties:
+  compatible:
+    items:
+      - const: i2c-hotplug-gpio
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  interrupts-extended:
+    minItems: 1
+
+  detect-gpios:
+    maxItems: 1
+
+  i2c-parent:
+    maxItems: 1
+
+required:
+  - compatible
+  - '#address-cells'
+  - '#size-cells'
+  - interrupts-extended
+  - detect-gpios
+  - i2c-parent
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    /*
+     * Asus Transformers use I2C hotplug for attachable dock keyboard
+     */
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c-dock {
+        compatible = "i2c-hotplug-gpio";
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        interrupts-extended = <&gpio 164 IRQ_TYPE_EDGE_BOTH>;
+        detect-gpios = <&gpio 164 GPIO_ACTIVE_LOW>;
+
+        i2c-parent = <&gen2_i2c>;
+    };
+...
-- 
2.39.2