linux-kernel - [PATCH v5 1/2] mfd: google,cros-ec: add DT bindings for a baseboard's switch device

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Message-Id: <20210415032958.740233-2-ikjn@chromium.org>
Date:   Thu, 15 Apr 2021 11:29:57 +0800
From:   Ikjoon Jang <ikjn@...omium.org>
To:     linux-input@...r.kernel.org, devicetree@...r.kernel.org
Cc:     Dmitry Torokhov <dtor@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Ikjoon Jang <ikjn@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH v5 1/2] mfd: google,cros-ec: add DT bindings for a baseboard's switch device

This is for ChromeOS tablets which have a 'cros_cbas' switch device
in the "Whiskers" base board. This device can be instantiated only by
device tree on ARM platforms. ChromeOS EC doesn't provide a way to
probe the device.

Signed-off-by: Ikjoon Jang <ikjn@...omium.org>

---

Changes in v5:
 - Add missing blank lines and change the description property's position.
 - Add a note to description: "this device cannot be detected at runtime."

Changes in v4:
Define cros-cbase bindings inside google,cros-ec.yaml instead of
a separated binding document.

 .../bindings/mfd/google,cros-ec.yaml          | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
index 76bf16ee27ec..8dcce176b72e 100644
--- a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
+++ b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
@@ -114,6 +114,22 @@ properties:
       - "#address-cells"
       - "#size-cells"
 
+  cbas:
+    type: object
+
+    description:
+      This device is used to signal when a detachable base is attached
+      to a Chrome OS tablet. This device cannot be detected at runtime.
+
+    properties:
+      compatible:
+        const: google,cros-cbas
+
+    required:
+      - compatible
+
+    additionalProperties: false
+
 patternProperties:
   "^i2c-tunnel[0-9]*$":
     type: object
@@ -180,6 +196,10 @@ examples:
             interrupts = <99 0>;
             interrupt-parent = <&gpio7>;
             spi-max-frequency = <5000000>;
+
+            base_detection: cbas {
+                compatible = "google,cros-cbas";
+            };
         };
     };
 
-- 
2.31.1.295.g9ea45b61b8-goog