This patch adds support for the Mule I2C multiplexer. Mule is an mcu that emulates a set of i2c devices which are reacheable through an i2c-mux. The emulated devices share a single i2c address with the mux itself where the requested register is what determines which logic is executed (mux or device). Signed-off-by: Farouk Bouabid <farouk.bouabid@xxxxxxxxxxxxxxxxxxxxx> --- .../devicetree/bindings/i2c/i2c-mux-mule.yaml | 80 ++++++++++++++++++++++ 1 file changed, 80 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-mule.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux-mule.yaml new file mode 100644 index 000000000000..458e4661cbc8 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-mule.yaml @@ -0,0 +1,80 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/i2c-mux-mule.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Mule I2C multiplexer + +maintainers: + - Farouk Bouabid <farouk.bouabid@xxxxxxxxxxxxxxxxxxxxx> + - Quentin Schulz <quentin.schulz@xxxxxxxxxxxxxxxxxxxxx> + +description: | + Mule is an mcu that emulates a set of i2c devices which are reacheable + through an i2c-mux. + + The emulated devices share a single i2c address with the mux itself where + the requested register is what determines which logic is executed (mux or + device) + + +--------------------------------------------------+ + | Mule | + | +---------------+ | + ------+->|Config register|----+ | + | | +---------------+ | | + | | V_ | + | | | \ +--------+ | + | | | \-------->| dev #0 | | + | | | | +--------+ | + | | | M |-------->| dev #1 | | + | +--------------------->| U | +--------+ | + | | X |-------->| dev #2 | | + | | | +--------+ | + | | /-------->| dev #3 | | + | |__/ +--------+ | + +--------------------------------------------------+ + + +allOf: + - $ref: /schemas/i2c/i2c-mux.yaml# + +properties: + compatible: + const: tsd,mule-i2c-mux + + reg: + maxItems: 1 + +required: + - compatible + - reg + +unevaluatedProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + i2c-mux@18 { + compatible = "tsd,mule-i2c-mux"; + reg = <0x18>; + #address-cells = <1>; + #size-cells = <0>; + + i2c@0 { + reg = <0x0>; + #address-cells = <1>; + #size-cells = <0>; + + fan: fan@18 { + compatible = "ti,amc6821"; + reg = <0x18>; + #cooling-cells = <2>; + }; + }; + }; + }; +... -- 2.34.1
