Date:   Fri, 8 Oct 2021 14:09:15 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] regulator: dt-bindings: maxim,max77686: convert to
 dtschema

On 04/10/2021 17:07, Rob Herring wrote:
> On Tue, Sep 28, 2021 at 04:13:52PM +0200, Krzysztof Kozlowski wrote:
>> Convert the regulators of Maxim MAX77686 PMIC to DT schema format.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
>> ---
>>  .../bindings/regulator/max77686.txt           | 71 --------------
>>  .../bindings/regulator/maxim,max77686.yaml    | 92 +++++++++++++++++++
>>  MAINTAINERS                                   |  1 +
>>  3 files changed, 93 insertions(+), 71 deletions(-)
>>  delete mode 100644 Documentation/devicetree/bindings/regulator/max77686.txt
>>  create mode 100644 Documentation/devicetree/bindings/regulator/maxim,max77686.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/regulator/max77686.txt b/Documentation/devicetree/bindings/regulator/max77686.txt
>> deleted file mode 100644
>> index e9f7578ca09a..000000000000
>> --- a/Documentation/devicetree/bindings/regulator/max77686.txt
>> +++ /dev/null
>> @@ -1,71 +0,0 @@
>> -Binding for Maxim MAX77686 regulators
>> -
>> -This is a part of the device tree bindings of MAX77686 multi-function device.
>> -More information can be found in ../mfd/max77686.txt file.
>> -
>> -The MAX77686 PMIC has 9 high-efficiency Buck and 26 Low-DropOut (LDO)
>> -regulators that can be controlled over I2C.
>> -
>> -Following properties should be present in main device node of the MFD chip.
>> -
>> -Optional node:
>> -- voltage-regulators : The regulators of max77686 have to be instantiated
>> -  under subnode named "voltage-regulators" using the following format.
>> -
>> -	regulator_name {
>> -		regulator-compatible = LDOn/BUCKn
>> -		standard regulator constraints....
>> -	};
>> -	refer Documentation/devicetree/bindings/regulator/regulator.txt
>> -
>> -  The regulator node's name should be initialized with a string
>> -to get matched with their hardware counterparts as follow:
>> -
>> -	-LDOn 	:	for LDOs, where n can lie in range 1 to 26.
>> -			example: LDO1, LDO2, LDO26.
>> -	-BUCKn 	:	for BUCKs, where n can lie in range 1 to 9.
>> -			example: BUCK1, BUCK5, BUCK9.
>> -
>> -  Regulators which can be turned off during system suspend:
>> -	-LDOn	:	2, 6-8, 10-12, 14-16,
>> -	-BUCKn	:	1-4.
>> -  Use standard regulator bindings for it ('regulator-off-in-suspend').
>> -
>> -  LDO20, LDO21, LDO22, BUCK8 and BUCK9 can be configured to GPIO enable
>> -  control. To turn this feature on this property must be added to the regulator
>> -  sub-node:
>> -	- maxim,ena-gpios :	one GPIO specifier enable control (the gpio
>> -				flags are actually ignored and always
>> -				ACTIVE_HIGH is used)
>> -
>> -Example:
>> -
>> -	max77686: pmic@9 {
>> -		compatible = "maxim,max77686";
>> -		interrupt-parent = <&wakeup_eint>;
>> -		interrupts = <26 IRQ_TYPE_NONE>;
>> -		reg = <0x09>;
>> -
>> -		voltage-regulators {
>> -			ldo11_reg: LDO11 {
>> -				regulator-name = "vdd_ldo11";
>> -				regulator-min-microvolt = <1900000>;
>> -				regulator-max-microvolt = <1900000>;
>> -				regulator-always-on;
>> -			};
>> -
>> -			buck1_reg: BUCK1 {
>> -				regulator-name = "vdd_mif";
>> -				regulator-min-microvolt = <950000>;
>> -				regulator-max-microvolt = <1300000>;
>> -				regulator-always-on;
>> -				regulator-boot-on;
>> -			};
>> -
>> -			buck9_reg: BUCK9 {
>> -				regulator-name = "CAM_ISP_CORE_1.2V";
>> -				regulator-min-microvolt = <1000000>;
>> -				regulator-max-microvolt = <1200000>;
>> -				maxim,ena-gpios = <&gpm0 3 GPIO_ACTIVE_HIGH>;
>> -			};
>> -	};
>> diff --git a/Documentation/devicetree/bindings/regulator/maxim,max77686.yaml b/Documentation/devicetree/bindings/regulator/maxim,max77686.yaml
>> new file mode 100644
>> index 000000000000..33a80a8caf26
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/regulator/maxim,max77686.yaml
>> @@ -0,0 +1,92 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/regulator/maxim,max77686.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Maxim MAX77686 Power Management IC regulators
>> +
>> +maintainers:
>> +  - Chanwoo Choi <cw00.choi@...sung.com>
>> +  - Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
>> +
>> +description: |
>> +  This is a part of device tree bindings for Maxim MAX77686 Power Management
>> +  Integrated Circuit (PMIC).
>> +
>> +  The Maxim MAX77686 provides high-efficiency Buck and 26 Low-DropOut (LDO)
>> +  regulators.
>> +
>> +  See also Documentation/devicetree/bindings/mfd/maxim,max77686.yaml for
>> +  additional information and example.
>> +
>> +patternProperties:
>> +  # 26 LDOs
>> +  "^LDO([1-9]|1[0-9]|2[0-6])$":
>> +    type: object
>> +    $ref: regulator.yaml#
>> +    description: |
>> +      Properties for single LDO regulator.
>> +      Regulators which can be turned off during system suspend:
>> +        LDO2, LDO6-8, LDO10-12, LDO14-16
>> +
>> +    properties:
>> +      regulator-name: true
>> +
>> +      maxim,ena-gpios:
>> +        maxItems: 1
>> +        description: |
>> +          GPIO specifier to enable the GPIO control (on/off) for regulator.
>> +
>> +    required:
>> +      - regulator-name
>> +
>> +    unevaluatedProperties: false
>> +
>> +    allOf:
>> +      - if:
>> +          properties:
>> +            $nodename:
> 
> I'm not sure this actually works with $nodename in child nodes.
> 
> I think I would just split out the 2 cases to 2 separate 
> patternProperties entries.
> 

I split the entries, slightly more code but it's actually easier to read.


Best regards,
Krzysztof

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