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Message-Id: <20240426-dev-mule-i2c-mux-v1-2-045a482f6ffb@theobroma-systems.com>
Date: Fri, 26 Apr 2024 18:49:33 +0200
From: Farouk Bouabid <farouk.bouabid@...obroma-systems.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>,
Peter Rosin <peda@...ntia.se>, Andi Shyti <andi.shyti@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Quentin Schulz <quentin.schulz@...obroma-systems.com>,
Heiko Stuebner <heiko@...ech.de>
Cc: linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org,
Farouk Bouabid <farouk.bouabid@...obroma-systems.com>
Subject: [PATCH 2/7] dt-bindings: i2c: mux: mule: add dt-bindings for mule
i2c multiplexer
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@...obroma-systems.com>
---
.../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@...obroma-systems.com>
+ - Quentin Schulz <quentin.schulz@...obroma-systems.com>
+
+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
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