linux-kernel - [PATCH v2 2/2] dt-bindings: mfd: cros-ec: add properties for thermal cooling cells

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Message-Id: <20241125-extend_power_limit-v2-2-c3266a86e9b1@chromium.org>
Date: Mon, 25 Nov 2024 16:31:17 +0800
From: Sung-Chi Li <lschyi@...omium.org>
To: Benson Leung <bleung@...omium.org>, Guenter Roeck <groeck@...omium.org>, 
 Sebastian Reichel <sre@...nel.org>, Lee Jones <lee@...nel.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: chrome-platform@...ts.linux.dev, linux-pm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 Sung-Chi Li <lschyi@...omium.org>
Subject: [PATCH v2 2/2] dt-bindings: mfd: cros-ec: add properties for
 thermal cooling cells

A charger chip is connect to the ChromeOS Embedded Controller (EC).
When external power input into the system, current would go through the
charger chip, generating heat in the system. The EC supports limiting
the input current, thus reducing the generated heat. As a result, EC is
a simulated passive cooling device.

We cannot reuse the existing charge managing mechanism in the power
framework due to:

- The power framework requires the charger to expose its thermal status,
  which is not a supported functionality on EC.
- We need to use different thermal sensors to run thermal control,
  rather than using thermal sensor on the charger.

Add the property '#cooling-cells' bindings, such that thermal framework
can recognize cros_ec as a valid thermal cooling device.

Signed-off-by: Sung-Chi Li <lschyi@...omium.org>
---
 Documentation/devicetree/bindings/mfd/google,cros-ec.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
index aac8819bd00b..2b6f098057af 100644
--- a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
+++ b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
@@ -96,6 +96,9 @@ properties:
   '#gpio-cells':
     const: 2
 
+  '#cooling-cells':
+    const: 2
+
   gpio-controller: true
 
   typec:

-- 
2.47.0.371.ga323438b13-goog