linux-kernel - [PATCH 1/2] dt-bindings: mux: gpio-mux: add support for ADG1712

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Message-ID: <20251121115750.20119-2-antoniu.miclaus@analog.com>
Date: Fri, 21 Nov 2025 11:57:31 +0000
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: Peter Rosin <peda@...ntia.se>, Rob Herring <robh@...nel.org>,
        Krzysztof
 Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Linus
 Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Srinivas Kandagatla <srini@...nel.org>,
        Antoniu Miclaus
	<antoniu.miclaus@...log.com>,
        Johan Hovold <johan+linaro@...nel.org>,
        David
 Lechner <dlechner@...libre.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>
Subject: [PATCH 1/2] dt-bindings: mux: gpio-mux: add support for ADG1712

Add support for the Analog Devices ADG1712 quad SPST switch to the
existing GPIO multiplexer bindings. The ADG1712 contains four
independent single-pole/single-throw (SPST) switches, each controlled
by a dedicated GPIO pin.

Unlike traditional multiplexers that use GPIOs as binary-encoded
selectors, the ADG1712 treats each GPIO as a direct switch controller.
The mux state represents the combination of all four switches, with
values from 0-15 corresponding to different switch combinations.

For example, state 5 (binary 0101) represents:
- SW1: ON (GPIO0 = 1)
- SW2: OFF (GPIO1 = 0)
- SW3: ON (GPIO2 = 1)
- SW4: OFF (GPIO3 = 0)

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
 .../devicetree/bindings/mux/gpio-mux.yaml     | 24 ++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mux/gpio-mux.yaml b/Documentation/devicetree/bindings/mux/gpio-mux.yaml
index ef7e33ec85d4..7c5784875683 100644
--- a/Documentation/devicetree/bindings/mux/gpio-mux.yaml
+++ b/Documentation/devicetree/bindings/mux/gpio-mux.yaml
@@ -17,9 +17,14 @@ description: |+
   multiplexer GPIO pins, where the first pin is the least significant
   bit. An active pin is a binary 1, an inactive pin is a binary 0.
 
+  For ADG1712, each GPIO directly controls one independent switch, and
+  the state represents the combination of all four switches (0-15).
+
 properties:
   compatible:
-    const: gpio-mux
+    enum:
+      - gpio-mux
+      - adi,adg1712
 
   mux-gpios:
     description:
@@ -100,4 +105,21 @@ examples:
             };
         };
     };
+
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    // ADG1712 quad SPST switch controller
+    adg1712: switch-controller {
+        compatible = "adi,adg1712";
+        #mux-control-cells = <0>;
+
+        mux-gpios = <&gpio 10 GPIO_ACTIVE_HIGH>,
+                    <&gpio 11 GPIO_ACTIVE_HIGH>,
+                    <&gpio 12 GPIO_ACTIVE_HIGH>,
+                    <&gpio 13 GPIO_ACTIVE_HIGH>;
+
+        // Initial state: SW1=ON, SW2=OFF, SW3=ON, SW4=OFF (binary: 0101 = 5)
+        idle-state = <5>;
+    };
 ...
-- 
2.43.0