linux-kernel - Re: [PATCH v2 3/3] dt-bindings: mfd: max8998: Add charger subnode binding

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Message-ID: <20180716180003.GA16037@rob-hp-laptop>
Date:   Mon, 16 Jul 2018 12:00:03 -0600
From:   Rob Herring <robh@...nel.org>
To:     Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, sre@...nel.org,
        lee.jones@...aro.org, mark.rutland@....com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 3/3] dt-bindings: mfd: max8998: Add charger subnode
 binding

On Sat, Jul 14, 2018 at 02:26:53PM +0200, Paweł Chmiel wrote:
> This patch adds devicetree bindings documentation for
> battery charging controller as the subnode of MAX8998 PMIC.
> 
> Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
> ---
> Changes from v1:
>   - Removed unneeded Fixes tag
>   - Correct description of all charger values
>   - Added missing property unit
> ---
>  Documentation/devicetree/bindings/mfd/max8998.txt | 24 +++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/max8998.txt b/Documentation/devicetree/bindings/mfd/max8998.txt
> index 23a3650ff2a2..196e50097a36 100644
> --- a/Documentation/devicetree/bindings/mfd/max8998.txt
> +++ b/Documentation/devicetree/bindings/mfd/max8998.txt
> @@ -50,6 +50,23 @@ Additional properties required if max8998,pmic-buck2-dvs-gpio is defined:
>  - max8998,pmic-buck2-dvs-voltage: An array of 2 voltage values in microvolts
>    for buck2 regulator that can be selected using dvs gpio.
>  
> +Charger: Configuration for battery charging controller should be added
> +inside a child node named 'charger'.
> +  Required properties:
> +  - max8998,charge-eoc-percent: Setup End of Charge Level.
> +    If value equals 0, leave it unchanged.
> +    Otherwise it should be value from 10 to 45 by 5 step.
> +
> +  - max8998,charge-restart-level-microvolt: Setup Charge Restart Level.
> +    If value equals 0, leave it unchanged.
> +    If value equals -1, it will be disabled.

-1 is a bit strange. Why not 'not present' is disabled?

> +    Otherwise it should be one of following values: 100, 150, 200.
> +
> +  - max8998,charge-timeout-hours: Setup Charge Full Timeout.
> +    If value equals 0, leave it unchanged.
> +    If value equals -1, it will be disabled.
> +    Otherwise it should be one of following values: 5, 6, 7.
> +
>  Regulators: All the regulators of MAX8998 to be instantiated shall be
>  listed in a child node named 'regulators'. Each regulator is represented
>  by a child node of the 'regulators' node.
> @@ -99,6 +116,13 @@ Example:
>  		max8998,pmic-buck2-dvs-gpio = <&gpx0 0 3 0 0>; /* SET3 */
>  		max8998,pmic-buck2-dvs-voltage = <1350000>, <1300000>;
>  
> +		/* Charger configuration */
> +		charger {
> +			max8998,charge-eoc-percent = <0>;
> +			max8998,charge-restart-level-microvolt = <(-1)>;
> +			max8998,charge-timeout-hours = <7>;
> +		};
> +
>  		/* Regulators to instantiate */
>  		regulators {
>  			ldo2_reg: LDO2 {
> -- 
> 2.7.4
>