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Message-ID: <20251026231754.2368904-2-jelonek.jonas@gmail.com>
Date: Sun, 26 Oct 2025 23:17:53 +0000
From: Jonas Jelonek <jelonek.jonas@...il.com>
To: Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Peter Rosin <peda@...ntia.se>,
Geert Uytterhoeven <geert+renesas@...der.be>
Cc: linux-gpio@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Jonas Jelonek <jelonek.jonas@...il.com>
Subject: [PATCH v2 1/2] dt-bindings: gpio: add gpio-line-mux controller
Add dt-schema for a gpio-line-mux controller which exposes virtual
GPIOs for a shared GPIO controlled by a multiplexer, e.g. a gpio-mux.
The gpio-line-mux controller is a gpio-controller, thus has mostly the
same semantics. However, it requires a mux-control to be specified upon
which it will operate.
Signed-off-by: Jonas Jelonek <jelonek.jonas@...il.com>
---
.../bindings/gpio/gpio-line-mux.yaml | 108 ++++++++++++++++++
.../devicetree/bindings/mux/gpio-mux.yaml | 30 +++++
2 files changed, 138 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-line-mux.yaml
diff --git a/Documentation/devicetree/bindings/gpio/gpio-line-mux.yaml b/Documentation/devicetree/bindings/gpio/gpio-line-mux.yaml
new file mode 100644
index 000000000000..4c907a35eb4d
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-line-mux.yaml
@@ -0,0 +1,108 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/gpio-line-mux.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO line mux
+
+maintainers:
+ - Jonas Jelonek <jelonek.jonas@...il.com>
+
+description:
+ A GPIO controller to provide virtual GPIOs for a 1-to-many mapping backed by
+ a single shared GPIO and a multiplexer. A simple illustrated example is
+
+ +----- A
+ IN/OUT /
+ <-----o------- B
+ / |\
+ | | +----- C
+ | | \
+ | | +--- D
+ | |
+ M1 M0
+
+ MUX CONTROL
+
+ M1 M0 IN/OUT
+ 0 0 A
+ 0 1 B
+ 1 0 C
+ 1 1 D
+
+ This can be used in case a real GPIO is connected to multiple inputs/outputs
+ and controlled by a multiplexer, and another subsystem/driver does not work
+ directly with the multiplexer subsystem.
+
+properties:
+ compatible:
+ const: gpio-line-mux
+
+ gpio-controller: true
+
+ "#gpio-cells":
+ const: 2
+
+ gpio-line-mux-states:
+ description: Mux states corresponding to the virtual GPIOs.
+ minItems: 1
+ items:
+ type: string
+
+ gpio-line-names: true
+
+ mux-controls:
+ maxItems: 1
+ $ref: /schemas/mux/mux-controller.yaml#
+ description:
+ Phandle to the multiplexer to control access to the GPIOs.
+
+ ngpios: false
+
+ shared-gpio:
+ description:
+ GPIO which is the '1' in 1-to-many and is shared by the virtual GPIOs
+ and controlled via the mux.
+
+required:
+ - compatible
+ - gpio-controller
+ - gpio-line-mux-states
+ - mux-controls
+ - shared-gpio
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ #include <dt-bindings/mux/mux.h>
+
+ sfp_gpio_mux: gpio-mux {
+ compatible = "gpio-mux";
+ mux-gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>,
+ <&gpio0 1 GPIO_ACTIVE_HIGH>;
+ #mux-control-cells = <0>;
+ idle-state = <MUX_IDLE_AS_IS>;
+ };
+
+ sfp1_gpio: sfp-gpio-1 {
+ compatible = "gpio-line-mux";
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ mux-controls = <&sfp_gpio_mux>;
+ shared-gpio = <&gpio0 2 GPIO_ACTIVE_HIGH>;
+
+ gpio-line-names = "SFP1_LOS", "SFP1_MOD_ABS", "SFP1_TX_FAULT";
+ gpio-line-mux-states = <0>, <1>, <3>;
+ };
+
+ sfp1: sfp-p1 {
+ compatible = "sff,sfp";
+
+ los-gpios = <&sfp1_gpio 0 GPIO_ACTIVE_HIGH>;
+ mod-def0-gpios = <&sfp1_gpio 1 GPIO_ACTIVE_LOW>;
+ tx-fault-gpios = <&sfp1_gpio 2 GPIO_ACTIVE_HIGH>;
+ };
diff --git a/Documentation/devicetree/bindings/mux/gpio-mux.yaml b/Documentation/devicetree/bindings/mux/gpio-mux.yaml
index ef7e33ec85d4..57eb1e9ef4cf 100644
--- a/Documentation/devicetree/bindings/mux/gpio-mux.yaml
+++ b/Documentation/devicetree/bindings/mux/gpio-mux.yaml
@@ -100,4 +100,34 @@ examples:
};
};
};
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ sfp_mux: mux-controller {
+ compatible = "gpio-mux";
+ #mux-control-cells = <0>;
+
+ mux-gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>,
+ <&gpio0 1 GPIO_ACTIVE_HIGH>;
+ };
+
+ sfp_gpio: sfp-gpio-1 {
+ compatible = "gpio-line-mux";
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ mux-controls = <&sfp_mux>;
+ shared-gpio = <&gpio0 2 GPIO_ACTIVE_HIGH>;
+
+ gpio-line-names = "SFP_LOS", "SFP_MOD_ABS", "SFP_TX_F";
+ gpio-line-mux-states = <0>, <1>, <2>;
+ };
+
+ sfp0: sfp-p0 {
+ compatible = "sff,sfp";
+
+ los-gpios = <&sfp_gpio 0 GPIO_ACTIVE_HIGH>;
+ mod-def0-gpios = <&sfp_gpio 1 GPIO_ACTIVE_LOW>;
+ tx-fault-gpios = <&sfp_gpio 2 GPIO_ACTIVE_HIGH>;
+ };
...
--
2.48.1
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