linux-kernel - Re: [PATCH v8 2/3] Add the bindings for the bq25150 and bq25155 500mA charging ICs from Texas Instruments.

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Message-ID: <20200526205312.GA337476@bogus>
Date:   Tue, 26 May 2020 14:53:12 -0600
From:   Rob Herring <robh@...nel.org>
To:     Dan Murphy <dmurphy@...com>
Cc:     sre@...nel.org, sspatil@...roid.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Ricardo Rivera-Matos <r-rivera-matos@...com>
Subject: Re: [PATCH v8 2/3] Add the bindings for the bq25150 and bq25155
 500mA charging ICs from Texas Instruments.

On Wed, May 20, 2020 at 07:20:26AM -0500, Dan Murphy wrote:
> From: Ricardo Rivera-Matos <r-rivera-matos@...com>
> 
> The BQ2515X family of devices are highly integrated battery management
> ICs that integrate the most common functions for wearable devices
> namely a charger, an output voltage rail, ADC for battery and system
> monitoring, and a push-button controller.
> 
> Datasheets:
> http://www.ti.com/lit/ds/symlink/bq25150.pdf
> http://www.ti.com/lit/ds/symlink/bq25155.pdf
> 
> Signed-off-by: Ricardo Rivera-Matos <r-rivera-matos@...com>
> ---
>  .../bindings/power/supply/bq2515x.yaml        | 106 ++++++++++++++++++
>  1 file changed, 106 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/supply/bq2515x.yaml
> 
> diff --git a/Documentation/devicetree/bindings/power/supply/bq2515x.yaml b/Documentation/devicetree/bindings/power/supply/bq2515x.yaml
> new file mode 100644
> index 000000000000..83487957fc8c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/supply/bq2515x.yaml
> @@ -0,0 +1,106 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (C) 2020 Texas Instruments Incorporated
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/power/supply/bq2515x.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: TI bq2515x 500-mA Linear charger family
> +
> +maintainers:
> +  - Dan Murphy <dmurphy@...com>
> +  - Ricardo Rivera-Matos <r-rivera-matos@...com>
> +
> +description: |
> +  The BQ2515x family is a highly integrated battery charge management IC that
> +  integrates the most common functions for wearable devices, namely a charger,
> +  an output voltage rail, ADC for battery and system monitoring, and
> +  push-button controller.
> +
> +  Specifications about the charger can be found at:
> +    http://www.ti.com/lit/ds/symlink/bq25150.pdf
> +    http://www.ti.com/lit/ds/symlink/bq25155.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,bq25150
> +      - ti,bq25155
> +
> +  reg:
> +    maxItems: 1
> +    description: I2C address of the charger.
> +
> +  ac-detect-gpios:
> +    description: |
> +       GPIO used for connecting the bq2515x device PG (AC Detect)
> +       pin.  This pin should be used if possible as this is the
> +       recommended way to obtain the charger's input PG state.
> +       If this pin is not specified a software-based approach for PG
> +       detection is used.

How many? (maxItems: 1)

Same for the rest of the GPIOs.

> +
> +  reset-gpios:
> +    description: |
> +       GPIO used for hardware reset.
> +
> +  low-power-gpios:
> +    description: |
> +       GPIO used for low power mode of IC.

powerdown-gpios is the somewhat standard name for this.

> +
> +  charge-enable-gpios:
> +    description: |
> +       GPIO used to turn on and off charging.
> +

> +  constant-charge-current-max-microamp:
> +    description: |
> +       Maximum charging current in micro Amps.
> +    minimum: 50000
> +    maximum: 600000
> +
> +  precharge-current-max-microamp:
> +    description: |
> +       Maximum precharging current in micro Amps.
> +    minimum: 1250
> +    maximum: 77500
> +
> +  input-current-limit-microamp:
> +    description: |
> +       Maximum input current in micro Amps.
> +    minimum: 50000
> +    maximum: 500000
> +
> +  constant-charge-voltage-max-microvolt:
> +    description: |
> +       Maximum charging voltage in micro volts.
> +    minimum: 3600000
> +    maximum: 4600000

Other than input-current-limit-microamp, none of these should be part of 
this schema as they apply to the battery node. There's not really a way 
for us to express something like this.

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

Add:

additionalProperties: false

> +
> +examples:
> +  - |
> +    bat: battery {
> +      compatible = "simple-battery";
> +      constant-charge-current-max-microamp = <50000>;
> +      precharge-current-microamp = <2500>;
> +      constant-charge-voltage-max-microvolt = <4000000>;
> +    };
> +    #include <dt-bindings/gpio/gpio.h>
> +    i2c0 {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      bq25150: charger@6b {
> +        compatible = "ti,bq25150";
> +        reg = <0x6b>;
> +        monitored-battery = <&bat>;

Not documented.

> +        input-current-limit-microamp = <100000>;
> +
> +        ac-detect-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
> +        reset-gpios = <&gpio0 14 GPIO_ACTIVE_HIGH>;
> +        low-power-gpios = <&gpio0 15 GPIO_ACTIVE_HIGH>;
> +        charge-enable-gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
> +      };
> +    };
> -- 
> 2.26.2
>