linux-kernel - Re: [PATCH v4 1/3] dt-bindings: chrome: Add ChromeOS fingerprint binding

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Date:   Mon, 21 Mar 2022 20:32:40 -0500
From:   Rob Herring <robh@...nel.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Benson Leung <bleung@...omium.org>, linux-kernel@...r.kernel.org,
        chrome-platform@...ts.linux.dev, 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>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v4 1/3] dt-bindings: chrome: Add ChromeOS fingerprint
 binding

On Mon, Mar 21, 2022 at 12:10:57PM -0700, Stephen Boyd wrote:
> Add a binding to describe the fingerprint processor found on Chromebooks
> with a fingerprint sensor. Previously we've been describing this with
> the google,cros-ec-spi binding but it lacks gpio and regulator control
> used during firmware flashing.

Then 'google,cros-ec-spi' should be a fallback?

> 
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: <devicetree@...r.kernel.org>
> Cc: Guenter Roeck <groeck@...omium.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Cc: Craig Hesling <hesling@...omium.org>
> Cc: Tom Hughes <tomhughes@...omium.org>
> Cc: Alexandru M Stan <amstan@...omium.org>
> Cc: Tzung-Bi Shih <tzungbi@...nel.org>
> Cc: Matthias Kaehlcke <mka@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  .../bindings/chrome/google,cros-ec-fp.yaml    | 66 +++++++++++++++++++
>  1 file changed, 66 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/chrome/google,cros-ec-fp.yaml
> 
> diff --git a/Documentation/devicetree/bindings/chrome/google,cros-ec-fp.yaml b/Documentation/devicetree/bindings/chrome/google,cros-ec-fp.yaml
> new file mode 100644
> index 000000000000..b7fbaaa94d65
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/chrome/google,cros-ec-fp.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/chrome/google,cros-ec-fp.yaml#
> +$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: true

maxItems: 1

> +  boot0-gpios:
> +    maxItems: 1
> +    description: Assert for bootloader mode.
> +
> +  vdd-supply: true
> +
> +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>;
> +        reset-gpios = <&gpio_controller 5 GPIO_ACTIVE_LOW>;
> +        boot0-gpios = <&gpio_controller 10 GPIO_ACTIVE_HIGH>;
> +        vdd-supply = <&pp3300_fp_mcu>;
> +      };
> +    };
> +...
> -- 
> https://chromeos.dev
> 
>