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([2001:9e8:f121:c116:be24:11ff:fe30:5d85]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b55d5cad80bsm74383766b.16.2025.10.09.15.35.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Oct 2025 15:35:18 -0700 (PDT) From: Jonas Jelonek To: Linus Walleij , Bartosz Golaszewski , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Jonas Jelonek Subject: [RFC PATCH v1 1/2] dt-bindings: gpio: add gpio-split controller Date: Thu, 9 Oct 2025 22:35:00 +0000 Message-ID: <20251009223501.570949-2-jelonek.jonas@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251009223501.570949-1-jelonek.jonas@gmail.com> References: <20251009223501.570949-1-jelonek.jonas@gmail.com> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add dt-schema for a virtual gpio-split controller which exposes virtual GPIOs for a shared GPIO controlled by a multiplexer, e.g. a gpio-mux. The gpio-split 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 --- .../devicetree/bindings/gpio/gpio-split.yaml | 77 +++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-split.yaml diff --git a/Documentation/devicetree/bindings/gpio/gpio-split.yaml b/Documentation/devicetree/bindings/gpio/gpio-split.yaml new file mode 100644 index 000000000000..9a58c81da4fa --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-split.yaml @@ -0,0 +1,77 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/gpio/gpio-split.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: GPIO split + +maintainers: + - Jonas Jelonek + +description: + A virtual GPIO controller to provide virtual GPIOs backed by a single real + GPIO and a multiplexer. This controller may be used in case a real GPIO is + connected to multiple inputs/outputs and controlled by a multiplexer, and + another subsystem/driver is not able to work with multiplexer subsystem. + +properties: + compatible: + const: gpio-split + + gpio-controller: true + + "#gpio-cells": + const: 2 + + gpio-line-names: true + + mux-controls: + maxItems: 1 + + ngpios: false + + shared-gpio: + description: + GPIO that is shared by the virtual GPIOs and controlled via the mux. + +required: + - compatible + - gpio-controller + - mux-controls + - shared-gpio + +additionalProperties: false + +examples: + - | + #include + #include + + sfp_gpio_mux: gpio-mux { + compatible = "gpio-mux"; + mux-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>, + <&gpio0 14 GPIO_ACTIVE_HIGH>; + #mux-control-cells = <0>; + idle-state = ; + }; + + sfp1_gpio: sfp-gpio-1 { + compatible = "gpio-split"; + gpio-controller; + #gpio-cells = <2>; + + mux-controls = <&sfp_gpio_mux>; + shared-gpio = <&gpio0 19 GPIO_ACTIVE_HIGH>; + + gpio-line-names = "SFP1_LOS", "SFP1_MOD_ABS", "SFP1_TX_FAULT"; + gpio-0 { + mux-state = <0>; + }; + gpio-1 { + mux-state = <1>; + }; + gpio-2 { + mux-state = <3>; + }; + }; -- 2.48.1