linux-kernel - [PATCH v1 1/2] dt-bindings: i2c: Document GPIO detected hot-plugged I2C bus

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Message-ID: <20250915060141.12540-2-clamor95@gmail.com>
Date: Mon, 15 Sep 2025 09:01:37 +0300
From: Svyatoslav Ryhel <clamor95@...il.com>
To: Andi Shyti <andi.shyti@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Peter Rosin <peda@...ntia.se>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>,
	Svyatoslav Ryhel <clamor95@...il.com>,
	Jonas Schwöbel <jonasschwoebel@...oo.de>
Cc: linux-i2c@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/2] dt-bindings: i2c: Document GPIO detected hot-plugged I2C bus

Schema describes hardware configuration that uses a GPIO signal to
determine the bus's presence and state, allowing the system to dynamically
configure I2C devices as they are plugged in or removed.

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..d1d5d830c91b
--- /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>
+  - Svyatoslav Ryhel <clamor95@...il.com>
+
+description: An I2C bus, where some devices on the bus are hot-pluggable
+  and their presence is indicated by GPIO line.
+
+properties:
+  compatible:
+    const: i2c-hotplug-gpio
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  interrupts:
+    maxItems: 1
+
+  detect-gpios:
+    description: usually the same GPIO used as an interrupt. In the active
+      state should indicate that detachable devices are plugged in.
+    maxItems: 1
+
+  i2c-parent:
+    maxItems: 1
+
+required:
+  - compatible
+  - '#address-cells'
+  - '#size-cells'
+  - interrupts
+  - detect-gpios
+  - i2c-parent
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c-dock {
+        compatible = "i2c-hotplug-gpio";
+
+        interrupt-parent = <&gpio>;
+        interrupts = <164 IRQ_TYPE_EDGE_BOTH>;
+
+        detect-gpios = <&gpio 164 GPIO_ACTIVE_LOW>;
+
+        i2c-parent = <&gen2_i2c>;
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+    };
+...
-- 
2.48.1