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Date:   Thu, 9 Jul 2020 13:35:20 -0600
From:   Rob Herring <robh@kernel.org>
To:     Ricardo Rivera-Matos <r-rivera-matos@ti.com>
Cc:     sre@kernel.org, pali@kernel.org, afd@ti.com, dmurphy@ti.com,
        linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org, sspatil@android.com
Subject: Re: [PATCH v16 2/4] dt-bindings: power: Convert battery.txt to
 battery.yaml
Message-ID: <20200709193520.GA750493@bogus>
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 <20200707212914.31540-3-r-rivera-matos@ti.com>
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On Tue, Jul 07, 2020 at 04:29:12PM -0500, Ricardo Rivera-Matos wrote:
> From: Dan Murphy <dmurphy@ti.com>
> 
> Convert the battery.txt file to yaml and fix up the examples.
> 
> Signed-off-by: Dan Murphy <dmurphy@ti.com>
> ---
>  .../bindings/power/supply/battery.txt         |  86 +---------
>  .../bindings/power/supply/battery.yaml        | 157 ++++++++++++++++++
>  2 files changed, 158 insertions(+), 85 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/power/supply/battery.yaml
> 
> diff --git a/Documentation/devicetree/bindings/power/supply/battery.txt b/Documentation/devicetree/bindings/power/supply/battery.txt
> index 5e29595edd74..a9f80cc49068 100644
> --- a/Documentation/devicetree/bindings/power/supply/battery.txt
> +++ b/Documentation/devicetree/bindings/power/supply/battery.txt
> @@ -1,87 +1,3 @@
> -Battery Characteristics
> -
> -The devicetree battery node provides static battery characteristics.
> -In smart batteries, these are typically stored in non-volatile memory
> -on a fuel gauge chip. The battery node should be used where there is
> -no appropriate non-volatile memory, or it is unprogrammed/incorrect.
> -
> -Upstream dts files should not include battery nodes, unless the battery
> -represented cannot easily be replaced in the system by one of a
> -different type. This prevents unpredictable, potentially harmful,
> -behavior should a replacement that changes the battery type occur
> -without a corresponding update to the dtb.
> +The contents of this file has been moved to battery.yaml
>  
>  Please note that not all charger drivers respect all of the properties.
> -
> -Required Properties:
> - - compatible: Must be "simple-battery"
> -
> -Optional Properties:
> - - over-voltage-threshold-microvolt: battery over-voltage limit
> - - re-charge-voltage-microvolt: limit to automatically start charging again
> - - voltage-min-design-microvolt: drained battery voltage
> - - voltage-max-design-microvolt: fully charged battery voltage
> - - energy-full-design-microwatt-hours: battery design energy
> - - charge-full-design-microamp-hours: battery design capacity
> - - trickle-charge-current-microamp: current for trickle-charge phase
> - - precharge-current-microamp: current for pre-charge phase
> - - precharge-upper-limit-microvolt: limit when to change to constant charging
> - - charge-term-current-microamp: current for charge termination phase
> - - constant-charge-current-max-microamp: maximum constant input current
> - - constant-charge-voltage-max-microvolt: maximum constant input voltage
> - - factory-internal-resistance-micro-ohms: battery factory internal resistance
> - - ocv-capacity-table-0: An array providing the open circuit voltage (OCV)
> -   of the battery and corresponding battery capacity percent, which is used
> -   to look up battery capacity according to current OCV value. And the open
> -   circuit voltage unit is microvolt.
> - - ocv-capacity-table-1: Same as ocv-capacity-table-0
> - ......
> - - ocv-capacity-table-n: Same as ocv-capacity-table-0
> - - ocv-capacity-celsius: An array containing the temperature in degree Celsius,
> -   for each of the battery capacity lookup table. The first temperature value
> -   specifies the OCV table 0, and the second temperature value specifies the
> -   OCV table 1, and so on.
> - - resistance-temp-table: An array providing the temperature in degree Celsius
> -   and corresponding battery internal resistance percent, which is used to look
> -   up the resistance percent according to current temperature to get a accurate
> -   batterty internal resistance in different temperatures.
> -
> -Battery properties are named, where possible, for the corresponding
> -elements in enum power_supply_property, defined in
> -https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/power_supply.h
> -
> -Batteries must be referenced by chargers and/or fuel-gauges
> -using a phandle. The phandle's property should be named
> -"monitored-battery".
> -
> -Example:
> -
> -	bat: battery {
> -		compatible = "simple-battery";
> -		voltage-min-design-microvolt = <3200000>;
> -		voltage-max-design-microvolt = <4200000>;
> -		energy-full-design-microwatt-hours = <5290000>;
> -		charge-full-design-microamp-hours = <1430000>;
> -		precharge-current-microamp = <256000>;
> -		charge-term-current-microamp = <128000>;
> -		constant-charge-current-max-microamp = <900000>;
> -		constant-charge-voltage-max-microvolt = <4200000>;
> -		factory-internal-resistance-micro-ohms = <250000>;
> -		ocv-capacity-celsius = <(-10) 0 10>;
> -		ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>, ...;
> -		ocv-capacity-table-1 = <4200000 100>, <4185000 95>, <4113000 90>, ...;
> -		ocv-capacity-table-2 = <4250000 100>, <4200000 95>, <4185000 90>, ...;
> -		resistance-temp-table = <20 100>, <10 90>, <0 80>, <(-10) 60>;
> -	};
> -
> -	charger: charger@11 {
> -		....
> -		monitored-battery = <&bat>;
> -		...
> -	};
> -
> -	fuel_gauge: fuel-gauge@22 {
> -		....
> -		monitored-battery = <&bat>;
> -		...
> -	};
> diff --git a/Documentation/devicetree/bindings/power/supply/battery.yaml b/Documentation/devicetree/bindings/power/supply/battery.yaml
> new file mode 100644
> index 000000000000..0b3fc8cc6163
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/supply/battery.yaml
> @@ -0,0 +1,157 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/power/supply/battery.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Battery Characteristics
> +
> +maintainers:
> +  - Sebastian Reichel <sre@kernel.org>
> +
> +description: |
> +  The devicetree battery node provides static battery characteristics.
> +  In smart batteries, these are typically stored in non-volatile memory
> +  on a fuel gauge chip. The battery node should be used where there is
> +  no appropriate non-volatile memory, or it is unprogrammed/incorrect.
> +
> +  Upstream dts files should not include battery nodes, unless the battery
> +  represented cannot easily be replaced in the system by one of a
> +  different type. This prevents unpredictable, potentially harmful,
> +  behavior should a replacement that changes the battery type occur
> +  without a corresponding update to the dtb.
> +
> +  Battery properties are named, where possible, for the corresponding elements
> +  in enum power_supply_property, defined in include/linux/power_supply.h
> +
> +  Batteries must be referenced by chargers and/or fuel-gauges using a phandle.
> +  The phandle's property should be named "monitored-battery".
> +
> +properties:
> +  compatible:
> +    const: simple-battery
> +
> +  over-voltage-threshold-microvolt:
> +    description: battery over-voltage limit
> +
> +  re-charge-voltage-microvolt:
> +    description: limit to automatically start charging again
> +
> +  voltage-min-design-microvolt:
> +    description: drained battery voltage
> +
> +  voltage-max-design-microvolt:
> +    description: fully charged battery voltage
> +
> +  energy-full-design-microwatt-hours:
> +    description: battery design energy
> +
> +  charge-full-design-microamp-hours:
> +    description: battery design capacity
> +
> +  trickle-charge-current-microamp:
> +    description: current for trickle-charge phase
> +
> +  precharge-current-microamp:
> +    description: current for pre-charge phase
> +
> +  precharge-upper-limit-microvolt:
> +    description: limit when to change to constant charging
> +
> +  charge-term-current-microamp:
> +    description: current for charge termination phase
> +
> +  constant-charge-current-max-microamp:
> +    description: maximum constant input current
> +
> +  constant-charge-voltage-max-microvolt:
> +    description: maximum constant input voltage
> +
> +  factory-internal-resistance-micro-ohms:
> +    description: battery factory internal resistance
> +
> +  monitored-battery:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: phandle to the battery node being monitored

This needs to be a separate schema because it doesn't apply to 
simple-battery nodes.

> +
> +required:
> +  - compatible
> +
> +patternProperties:
> +  '^ocv-capacity-table-[0-100]$':
> +    $ref: /schemas/types.yaml#/definitions/uint32-matrix
> +    description: |
> +      An array providing the open circuit voltage (OCV)
> +      of the battery and corresponding battery capacity percent, which is used
> +      to look up battery capacity according to current OCV value. And the open
> +      circuit voltage unit is microvolt.
> +    maxItems: 100
> +    items:
> +      items:
> +        - description: open circuit voltage (OCV) in microvolts
> +        - description: battery capacity percent
> +          maximum: 100
> +
> +  '^resistance-temp-table-[0-100]$':
> +    $ref: /schemas/types.yaml#/definitions/uint32-matrix
> +    description: |
> +      An array providing the temperature in degree Celsius
> +      and corresponding battery internal resistance percent, which is used to
> +      look up the resistance percent according to current temperature to get an
> +      accurate batterty internal resistance in different temperatures.
> +    maxItems: 100
> +    items:
> +      items:
> +        - description: internal resistance percent
> +        - description: battery capacity percent
> +          maximum: 100
> +
> +  '^ocv-capacity-celsius-[0-100]$':
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    description: |
> +      An array containing the temperature in degree Celsius,
> +      for each of the battery capacity lookup table.
> +    maxItems: 100

This doesn't seem right. You can have a 100 tuples or just 2 u32's? If 
the former, the type here should also be uint32-matrix. For the latter, 
drop this and the first 'items'.

> +    items:
> +      items:
> +        - description: temperature in degree Celsius
> +        - description: battery capacity percent
> +          maximum: 100
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    power {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      battery:battery {

space            ^

> +        compatible = "simple-battery";
> +        over-voltage-threshold-microvolt = <4500000>;
> +        re-charge-voltage-microvolt = <250000>;
> +        voltage-min-design-microvolt = <3200000>;
> +        voltage-max-design-microvolt = <4200000>;
> +        energy-full-design-microwatt-hours = <5290000>;
> +        charge-full-design-microamp-hours = <1430000>;
> +        precharge-current-microamp = <256000>;
> +        precharge-upper-limit-microvolt = <2500000>;
> +        charge-term-current-microamp = <128000>;
> +        constant-charge-current-max-microamp = <900000>;
> +        constant-charge-voltage-max-microvolt = <4200000>;
> +        factory-internal-resistance-micro-ohms = <250000>;
> +        ocv-capacity-celsius-0 = <(-10) 10>;
> +        ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>;
> +        resistance-temp-table-0 = <20 100>, <10 90>, <0 80>, <(-10) 60>;
> +      };
> +
> +      charger@11 {
> +        reg = <0x11>;
> +        monitored-battery = <&battery>;
> +      };
> +
> +      fuel-gauge@22 {
> +        reg = <0x22>;
> +        monitored-battery = <&battery>;
> +      };
> +    };
> -- 
> 2.27.0
>