linux-kernel - [PATCH 1/2] dt-bindings: mfd: Add ChromeOS fingerprint binding

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Message-Id: <20220314232214.4183078-2-swboyd@chromium.org>
Date:   Mon, 14 Mar 2022 16:22:13 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Benson Leung <bleung@...omium.org>
Cc:     linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Guenter Roeck <groeck@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Craig Hesling <hesling@...omium.org>,
        Tom Hughes <tomhughes@...omium.org>,
        Alexandru M Stan <amstan@...omium.org>
Subject: [PATCH 1/2] dt-bindings: mfd: Add ChromeOS fingerprint binding

Add a binding to describe the fingerprint processor found on Chromeboks
with a fingerprint sensor.

Cc: Rob Herring <robh+dt@...nel.org>
Cc: <devicetree@...r.kernel.org>
Cc: Guenter Roeck <groeck@...omium.org>
Cc: Douglas Anderson <dianders@...omium.org>
Cc: Craig Hesling <hesling@...omium.org>
Cc: Tom Hughes <tomhughes@...omium.org>
Cc: Alexandru M Stan <amstan@...omium.org>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 .../bindings/mfd/google,cros-ec-fp.yaml       | 89 +++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/google,cros-ec-fp.yaml

diff --git a/Documentation/devicetree/bindings/mfd/google,cros-ec-fp.yaml b/Documentation/devicetree/bindings/mfd/google,cros-ec-fp.yaml
new file mode 100644
index 000000000000..05d2b2b9b713
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/google,cros-ec-fp.yaml
@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/google,cros-ec-fp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ChromeOS Embedded Fingerprint Controller
+
+description:
+  Google's ChromeOS embedded fingerprint controller is a device which
+  implements fingerprint functionality such as unlocking a Chromebook
+  without typing a password.
+
+maintainers:
+  - Tom Hughes <tomhughes@...omium.org>
+
+properties:
+  compatible:
+    const: google,cros-ec-fp
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 3000000
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+    description: reset signal (active low).
+
+  boot0-gpios:
+    maxItems: 1
+    description: boot signal (low for normal boot; high for bootloader).
+
+  vdd-supply:
+    description: Power supply for the fingerprint controller.
+
+  google,cros-ec-spi-pre-delay:
+    description:
+      This property specifies the delay in usecs between the
+      assertion of the CS and the first clock pulse.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+      - default: 0
+      - minimum: 0
+
+  google,cros-ec-spi-msg-delay:
+    description:
+      This property specifies the delay in usecs between messages.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+      - default: 0
+      - minimum: 0
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - reset-gpios
+  - boot0-gpios
+  - vdd-supply
+  - spi-max-frequency
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+      #address-cells = <0x1>;
+      #size-cells = <0x0>;
+      ec@0 {
+        compatible = "google,cros-ec-fp";
+        reg = <0>;
+        interrupt-parent = <&gpio_controller>;
+        interrupts = <4 IRQ_TYPE_LEVEL_LOW>;
+        spi-max-frequency = <3000000>;
+        google,cros-ec-spi-msg-delay = <37>;
+        google,cros-ec-spi-pre-delay = <5>;
+        reset-gpios = <&gpio_controller 5 GPIO_ACTIVE_LOW>;
+        boot0-gpios = <&gpio_controller 10 GPIO_ACTIVE_LOW>;
+        vdd-supply = <&pp3300_fp_mcu>;
+      };
+    };
+...
-- 
https://chromeos.dev