linux-kernel - [PATCH 1/3] dt-bindings: platform: Add Lenovo Thinkpad T14s EC

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Message-Id: <20250831-thinkpad-t14s-ec-v1-1-6e06a07afe0f@collabora.com>
Date: Sun, 31 Aug 2025 23:28:31 +0200
From: Sebastian Reichel <sre@...nel.org>
To: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Hans de Goede <hansg@...nel.org>, 
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Mark Pearson <mpearson-lenovo@...ebb.ca>
Cc: "Derek J. Clark" <derekjohn.clark@...il.com>, 
 Henrique de Moraes Holschuh <hmh@....eng.br>, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org
Subject: [PATCH 1/3] dt-bindings: platform: Add Lenovo Thinkpad T14s EC

Add binding for the EC found in the Thinkpad T14s Gen6 Snapdragon,
which is based on the Qualcomm X1 Elite. Some of the system LEDs
and extra keys are only accessible via the EC.

Signed-off-by: Sebastian Reichel <sre@...nel.org>
---
 .../bindings/platform/lenovo,thinkpad-t14s-ec.yaml | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/Documentation/devicetree/bindings/platform/lenovo,thinkpad-t14s-ec.yaml b/Documentation/devicetree/bindings/platform/lenovo,thinkpad-t14s-ec.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..bab20df2d9ede9a3cb0359944b26b3d18ff7d9b8
--- /dev/null
+++ b/Documentation/devicetree/bindings/platform/lenovo,thinkpad-t14s-ec.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/platform/lenovo,thinkpad-t14s-ec.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lenovo Thinkpad T14s Embedded Controller.
+
+maintainers:
+  - Sebastian Reichel <sre@...nel.org>
+
+description:
+  The Qualcomm Snapdragon-based Lenovo Thinkpad T14s has an Embedded Controller
+  (EC) which handles things such as keyboard backlight, LEDs or non-standard keys.
+  This binding describes the interface, on an I2C bus, to this EC.
+
+properties:
+  compatible:
+    const: lenovo,thinkpad-t14s-ec
+
+  reg:
+    const: 0x28
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |+
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c1 {
+        clock-frequency = <400000>;
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        embedded-controller@28 {
+            compatible = "lenovo,thinkpad-t14s-ec";
+            reg = <0x28>;
+            interrupts-extended = <&tlmm 66 IRQ_TYPE_LEVEL_LOW>;
+        };
+    };
+...

-- 
2.50.1