linux-kernel - Re: [PATCH v1 1/2] dt-bindings: power: Add the bq256xx dt bindings

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Date:   Tue, 18 Aug 2020 10:43:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ricardo Rivera-Matos <r-rivera-matos@...com>
Cc:     sre@...nel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dmurphy@...com
Subject: Re: [PATCH v1 1/2] dt-bindings: power: Add the bq256xx dt bindings

On Mon, Aug 17, 2020 at 02:17:22PM -0500, Ricardo Rivera-Matos wrote:
> Add the bindings for the bq256xx series of battery charging ICs.
> 
> Datasheets:
> - https://www.ti.com/lit/ds/symlink/bq25600.pdf
> - https://www.ti.com/lit/ds/symlink/bq25601.pdf
> - https://www.ti.com/lit/ds/symlink/bq25600d.pdf
> - https://www.ti.com/lit/ds/symlink/bq25601d.pdf
> - https://www.ti.com/lit/ds/symlink/bq25611d.pdf
> - https://www.ti.com/lit/ds/symlink/bq25618.pdf
> - https://www.ti.com/lit/ds/symlink/bq25619.pdf
> 
> Signed-off-by: Ricardo Rivera-Matos <r-rivera-matos@...com>
> ---
>  .../bindings/power/supply/bq256xx.yaml        | 99 +++++++++++++++++++
>  1 file changed, 99 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/supply/bq256xx.yaml
> 
> diff --git a/Documentation/devicetree/bindings/power/supply/bq256xx.yaml b/Documentation/devicetree/bindings/power/supply/bq256xx.yaml
> new file mode 100644
> index 000000000000..67db4ba9fdb6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/supply/bq256xx.yaml
> @@ -0,0 +1,99 @@
> +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
> +# Copyright (C) 2020 Texas Instruments Incorporated
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/power/supply/bq256xx.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: TI bq256xx Switch Mode Buck Charger
> +
> +maintainers:
> +  - Ricardo Rivera-Matos <r-rivera-matos@...com>
> +
> +description: |
> +  The bq256xx devices are a family of highly-integrated battery charge
> +  management and system power management ICs for single cell Li-ion and Li-
> +  polymer batteries.
> +
> +  Datasheets:
> +    - https://www.ti.com/lit/ds/symlink/bq25600.pdf
> +    - https://www.ti.com/lit/ds/symlink/bq25601.pdf
> +    - https://www.ti.com/lit/ds/symlink/bq25600d.pdf
> +    - https://www.ti.com/lit/ds/symlink/bq25601d.pdf
> +    - https://www.ti.com/lit/ds/symlink/bq25611d.pdf
> +    - https://www.ti.com/lit/ds/symlink/bq25618.pdf
> +    - https://www.ti.com/lit/ds/symlink/bq25619.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,bq25600
> +      - ti,bq25601
> +      - ti,bq25600d
> +      - ti,bq25601d
> +      - ti,bq25611d
> +      - ti,bq25618
> +      - ti,bq25619
> +
> +  reg:
> +    maxItems: 1
> +
> +  ti,watchdog-timer:

Poorly named since we have 'ti,watchdog-timers' already and is 
completely different.

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Watchdog timer in milli seconds. 0 (default) disables the watchdog

If you have units, then you should use standard unit suffix.

> +    minimum: 0
> +    maximum: 160000
> +    enum: [ 0, 40000, 80000, 160000]
> +
> +  input-voltage-limit-microvolt:
> +    description: |
> +       Minimum input voltage limit in micro volts with a 100000 micro volt step
> +    minimum: 3900000
> +    maximum: 5400000
> +
> +  input-current-limit-microamp:
> +    description: |
> +       Maximum input current limit in micro amps with a 100000 micro amp step
> +    minimum: 100000
> +    maximum: 3200000

Aren't these properties of the battery, not the charger?

> +
> +required:
> +  - compatible
> +  - reg

monitored-battery not required?

Add:

additionalProperties: false


> +
> +examples:
> +  - |
> +    bat: battery {
> +      compatible = "simple-battery";
> +      constant-charge-current-max-microamp = <2040000>;
> +      constant-charge-voltage-max-microvolt = <4352000>;
> +      precharge-current-microamp = <180000>;
> +      termination-current-microamp = <180000>;
> +    };
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    i2c0 {

i2c {

> +      pinctrl-names = "default";
> +      pinctrl-0 = <&i2c2_pins>;

Not relevant to the example.

> +
> +      status = "okay";

Don't show status in examples.

> +      clock-frequency = <400000>;
> +
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      bq25601@6b {

charger@6b

> +        compatible = "ti,bq25601";
> +        reg = <0x6b>;
> +        monitored-battery = <&bat>;
> +
> +        interrupt-parent = <&gpio1>;
> +        interrupts = <16 IRQ_TYPE_EDGE_FALLING>;
> +        watchdog-timer = <40000>;
> +
> +        input-voltage-limit-microvolt = <4500000>;
> +        input-current-limit-microamp = <2400000>;
> +       };
> +    };
> +...
> -- 
> 2.28.0
>