linux-kernel - Re: [PATCH 2/3] dt-bindings: chrome: add new binding google,cros-ec-chrage-state

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Message-ID: <20241118202520.GA3273373-robh@kernel.org>
Date: Mon, 18 Nov 2024 14:25:20 -0600
From: Rob Herring <robh@...nel.org>
To: "Sung-Chi, Li" <lschyi@...omium.org>
Cc: Benson Leung <bleung@...omium.org>, Tzung-Bi Shih <tzungbi@...nel.org>,
	Guenter Roeck <groeck@...omium.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
	linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: chrome: add new binding
 google,cros-ec-chrage-state

On Mon, Nov 18, 2024 at 05:33:47PM +0800, Sung-Chi, Li wrote:
> Add new dt bindings for charge chip control. The charge chip control
> dt configuration is used by the driver 'cros-ec-charge-state', which is
> added in the commit "platform/chrome: cros_ec_charge_state: add new
> driver to control charge".
> 
> As these charge chip controls are connected under the ChromeOS Embedded
> Controller (EC), also add the patternProperties to the
> mfd/google,cros-ec bindings.
> 
> Signed-off-by: Sung-Chi, Li <lschyi@...omium.org>
> ---
>  .../bindings/chrome/google,cros-charge-state.yaml  | 62 ++++++++++++++++++++++
>  .../devicetree/bindings/mfd/google,cros-ec.yaml    |  4 ++
>  2 files changed, 66 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/chrome/google,cros-charge-state.yaml b/Documentation/devicetree/bindings/chrome/google,cros-charge-state.yaml
> new file mode 100644
> index 000000000000..40e8f6988769
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/chrome/google,cros-charge-state.yaml
> @@ -0,0 +1,62 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/chrome/google,cros-charge-state.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Google Chrome OS EC(Embedded Controller) charge state driver.
> +
> +maintainers:
> +  - Sung-Chi, Li <lschyi@...omium.org>
> +
> +description:
> +  Chrome OS devices have an Embedded Controller(EC) which has access to
> +  battery charger IC. This node is intended to allow the host to read and
> +  control the charger current. The node for this device should be under a
> +  cros-ec node like google,cros-ec-spi.
> +
> +properties:
> +  compatible:
> +    const: google,cros-ec-charge-state
> +
> +  min-milliamp:
> +    description: min current in milliamp.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  max-milliamp:
> +    description: max current in milliamp.
> +    $ref: /schemas/types.yaml#/definitions/uint32

Use standard units defined in property-units.yaml.

No constraints? 4000000 amps is okay?

> +
> +  type:

Too generic. Property types are global. You need a vendor prefix for 
starters.

> +    description: current limit type.
> +    enum:
> +      - charge
> +      - input

What if you need to describe both?

> +
> +required:
> +  - compatible
> +  - min-milliamp
> +  - man-milliamp
> +  - type
> +
> +additionalProperties: false
> +
> +examples:
> +  - |+
> +    spi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      cros_ec: ec@0 {
> +        compatible = "google,cros-ec-spi";
> +        reg = <0>;
> +        interrupts = <35 0>;
> +
> +        charge_chip_battery_current: charge-chip-battery {
> +          compatible = "google,cros-ec-charge";
> +          type = "charge";
> +          min-milliamp = <150>;
> +          max-milliamp = <5000>;
> +        };
> +      };
> +    };
> diff --git a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
> index aac8819bd00b..3db4a48d5176 100644
> --- a/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
> +++ b/Documentation/devicetree/bindings/mfd/google,cros-ec.yaml
> @@ -166,6 +166,10 @@ patternProperties:
>      type: object
>      $ref: /schemas/extcon/extcon-usbc-cros-ec.yaml#
>  
> +  "^charge-chip-*":
> +    type: object
> +    $ref: /schemas/chrome/google,cros-charge-state.yaml#
> +
>  required:
>    - compatible
>  
> 
> -- 
> 2.47.0.338.g60cca15819-goog
>