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Fri, 6 Sep 2024 15:55:47 +0000 From: Farouk Bouabid Date: Fri, 06 Sep 2024 17:54:12 +0200 Subject: [PATCH v8 1/8] dt-bindings: i2c: add support for tsd,mule-i2c-mux Message-Id: <20240906-dev-mule-i2c-mux-v8-1-dbd28a150e41@cherry.de> References: <20240906-dev-mule-i2c-mux-v8-0-dbd28a150e41@cherry.de> In-Reply-To: <20240906-dev-mule-i2c-mux-v8-0-dbd28a150e41@cherry.de> To: Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Farouk Bouabid , Quentin Schulz , Peter Rosin , Jean Delvare , Guenter Roeck , Heiko Stuebner Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, Wolfram Sang X-Mailer: b4 0.15-dev-77eae X-ClientProxiedBy: VE1PR08CA0022.eurprd08.prod.outlook.com (2603:10a6:803:104::35) To DU0PR04MB9562.eurprd04.prod.outlook.com (2603:10a6:10:321::10) Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DU0PR04MB9562:EE_|PAXPR04MB8319:EE_ X-MS-Office365-Filtering-Correlation-Id: 3914f20d-8916-49b6-15ba-08dcce8c5f55 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|7416014|1800799024|52116014|921020|38350700014; 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The devices on the mux can be selected by writing the appropriate device number to an I2C config register. Reviewed-by: Rob Herring (Arm) Acked-by: Wolfram Sang Signed-off-by: Farouk Bouabid --- .../devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml | 69 ++++++++++++++++++++++ 1 file changed, 69 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml b/Documentation/devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml new file mode 100644 index 000000000000..28139b676661 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/tsd,mule-i2c-mux.yaml @@ -0,0 +1,69 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/tsd,mule-i2c-mux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Theobroma Systems Mule I2C multiplexer + +maintainers: + - Farouk Bouabid + - Quentin Schulz + +description: | + Theobroma Systems Mule is an MCU that emulates a set of I2C devices, among + which devices that are reachable through an I2C-mux. The devices on the mux + can be selected by writing the appropriate device number to an I2C config + register. + + + +--------------------------------------------------+ + | Mule | + 0x18| +---------------+ | + -------->|Config register|----+ | + | +---------------+ | | + | V_ | + | | \ +--------+ | + | | \-------->| dev #0 | | + | | | +--------+ | + 0x6f| | M |-------->| dev #1 | | + ---------------------------->| U | +--------+ | + | | X |-------->| dev #2 | | + | | | +--------+ | + | | /-------->| dev #3 | | + | |__/ +--------+ | + +--------------------------------------------------+ + + +allOf: + - $ref: /schemas/i2c/i2c-mux.yaml# + +properties: + compatible: + const: tsd,mule-i2c-mux + +required: + - compatible + +unevaluatedProperties: false + +examples: + - | + i2c-mux { + compatible = "tsd,mule-i2c-mux"; + #address-cells = <1>; + #size-cells = <0>; + + i2c@0 { + reg = <0x0>; + #address-cells = <1>; + #size-cells = <0>; + + rtc@6f { + compatible = "isil,isl1208"; + reg = <0x6f>; + }; + }; + }; +... +