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Message-Id: <20240725-dev-mule-i2c-mux-v6-1-f9f6d7b60fb2@cherry.de>
Date: Thu, 25 Jul 2024 15:27:47 +0200
From: Farouk Bouabid <farouk.bouabid@...rry.de>
To: Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Farouk Bouabid <farouk.bouabid@...rry.de>,
Quentin Schulz <quentin.schulz@...rry.de>, Peter Rosin <peda@...ntia.se>,
Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>,
Heiko Stuebner <heiko@...ech.de>
Cc: linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org
Subject: [PATCH v6 1/8] dt-bindings: i2c: add support for tsd,mule-i2c-mux
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.
Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
Signed-off-by: Farouk Bouabid <farouk.bouabid@...rry.de>
---
.../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 <farouk.bouabid@...rry.de>
+ - Quentin Schulz <quentin.schulz@...rry.de>
+
+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>;
+ };
+ };
+ };
+...
+
--
2.34.1
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