linux-kernel - Re: [PATCH v5 2/3] dt-bindings: power: supply: add cw2015

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Date:   Fri, 20 Mar 2020 16:31:08 -0600
From:   Rob Herring <robh@...nel.org>
To:     Tobias Schramm <t.schramm@...jaro.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sebastian Reichel <sre@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Maxime Ripard <mripard@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Mark Brown <broonie@...nel.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] dt-bindings: power: supply: add cw2015_battery
 bindings

On Sun, Mar 15, 2020 at 08:19:13PM +0100, Tobias Schramm wrote:
> This patch adds the dts binding schema for the cw2015 fuel gauge.
> 
> Signed-off-by: Tobias Schramm <t.schramm@...jaro.org>
> ---
>  .../bindings/power/supply/cw2015_battery.yaml | 83 +++++++++++++++++++
>  1 file changed, 83 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/supply/cw2015_battery.yaml
> 
> diff --git a/Documentation/devicetree/bindings/power/supply/cw2015_battery.yaml b/Documentation/devicetree/bindings/power/supply/cw2015_battery.yaml
> new file mode 100644
> index 000000000000..f789882312da
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/supply/cw2015_battery.yaml
> @@ -0,0 +1,83 @@
> +# SPDX-License-Identifier: GPL-2.0

Dual license new bindings please:

(GPL-2.0-only OR BSD-2-Clause)

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/power/supply/cw2015_battery.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Battery driver for CW2015 shuntless fuel gauge by CellWise.
> +
> +maintainers:
> +  - Tobias Schramm <t.schramm@...jaro.org>
> +
> +description: |
> +  The driver can utilize information from a simple-battery linked via a
> +  phandle in monitored-battery. If specified the driver uses the
> +  charge-full-design-microamp-hours property of the battery.
> +
> +properties:
> +  compatible:
> +    const: cellwise,cw2015
> +
> +  reg:
> +    items:
> +      - description: i2c address

Just:

maxItems: 1

> +
> +  cellwise,battery-profile:
> +    description: |
> +      This property specifies characteristics of the battery used. The format
> +      of this binary blob is kept secret by CellWise. The only way to obtain
> +      it is to mail two batteries to a test facility of CellWise and receive
> +      back a test report with the binary blob.
> +    allOf:
> +      - $ref: /schemas/types.yaml#definitions/uint8-array
> +    items:
> +      - minItems: 64
> +        maxItems: 64
> +
> +  cellwise,monitor-interval-ms:
> +    description:
> +      Specifies the interval in milliseconds gauge values are polled at
> +    $ref: /schemas/types.yaml#/definitions/uint32

Drop this as standard units already have a type definition. Is there 
some bounds to this?

> +
> +  power-supplies:
> +    description:
> +      Specifies supplies used for charging the battery connected to this gauge
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/phandle-array
> +      - minItems: 1
> +        maxItems: 8 # Should be enough
> +
> +  monitored-battery:
> +    description:
> +      Specifies the phandle of a simple-battery connected to this gauge
> +    $ref: /schemas/types.yaml#/definitions/phandle

These 2 properties should really have a common definition, but fine for 
now. 

> +
> +required:
> +  - compatible
> +  - reg
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        cw2015@62 {
> +            compatible = "cellwise,cw201x";
> +            reg = <0x62>;
> +            cellwise,battery-profile = /bits/ 8 <
> +                0x17 0x67 0x80 0x73 0x6E 0x6C 0x6B 0x63
> +                0x77 0x51 0x5C 0x58 0x50 0x4C 0x48 0x36
> +                0x15 0x0C 0x0C 0x19 0x5B 0x7D 0x6F 0x69
> +                0x69 0x5B 0x0C 0x29 0x20 0x40 0x52 0x59
> +                0x57 0x56 0x54 0x4F 0x3B 0x1F 0x7F 0x17
> +                0x06 0x1A 0x30 0x5A 0x85 0x93 0x96 0x2D
> +                0x48 0x77 0x9C 0xB3 0x80 0x52 0x94 0xCB
> +                0x2F 0x00 0x64 0xA5 0xB5 0x11 0xF0 0x11
> +           >;
> +           cellwise,monitor-interval-ms = <5000>;
> +           monitored-battery = <&bat>;
> +           power-supplies = <&mains_charger>, <&usb_charger>;
> +       };
> +    };
> +
> -- 
> 2.24.1
>