linux-kernel - Re: [PATCH v3 1/7] dt-bindings: mfd: brcm,bcm59056: Convert to YAML

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Message-ID: <d63009eb-654f-440b-8e59-441ed6b9606b@gmail.com>
Date: Tue, 4 Feb 2025 19:33:39 +0100
From: Artur Weber <aweber.kernel@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>,
 Florian Fainelli <florian.fainelli@...adcom.com>, Ray Jui
 <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>,
 Stanislav Jakubek <stano.jakubek@...il.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v3 1/7] dt-bindings: mfd: brcm,bcm59056: Convert to YAML

On 2.02.2025 14:27, Krzysztof Kozlowski wrote:
> On Fri, Jan 31, 2025 at 07:13:49PM +0100, Artur Weber wrote:
>> +$id: http://devicetree.org/schemas/mfd/brcm,bcm59056.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Broadcom BCM590xx Power Management IC
>> +
>> +maintainers:
>> +  - Artur Weber <aweber.kernel@...il.com>
>> +
>> +properties:
>> +  compatible:
>> +    const: brcm,bcm59056
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  regulators:
>> +    type: object
>> +    description: Container node for regulators.
>> +    $ref: ../regulator/brcm,bcm59056.yaml
> 
> Does this device have any other function? RTC? Charger? If not, maybe
> just put everything in one binding in regulator dir.
> 

Yes, the BCM590xx PMICs have multiple other functions: power-on key,
RTC, charger/fuel gauge and some USB/audio related controls. I am
planning to extend the driver to support all of these features in the
near future; when the time comes, the DT bindings will have to be
updated as well.

>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>> +
>> +    i2c {
>> +        #address-cells = <1>;
>> +        #size-cells = <0>;
>> +
>> +        pmic: bcm59056@8 {
> 
> Node names should be generic. See also an explanation and list of
> examples (not exhaustive) in DT specification:
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
> 

I will fix this in the next version.

>> +            compatible = "brcm,bcm59056";
>> +            reg = <0x08>;
>> +            interrupts = <GIC_SPI 215 IRQ_TYPE_LEVEL_HIGH>;
>> +
>> +            regulators {
>> +                rfldo_reg: rfldo {
>> +                    regulator-min-microvolt = <1200000>;
>> +                    regulator-max-microvolt = <3300000>;
>> +                };
>> +            };
>> +        };
>> +    };
>> diff --git a/Documentation/devicetree/bindings/regulator/brcm,bcm59056.yaml b/Documentation/devicetree/bindings/regulator/brcm,bcm59056.yaml
>> new file mode 100644
>> index 0000000000000000000000000000000000000000..8939004d5a3f079c05d313bed4a2f07fbc473bac
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/regulator/brcm,bcm59056.yaml
>> @@ -0,0 +1,58 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/regulator/brcm,bcm59056.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Broadcom BCM59056 Power Management IC regulators
>> +
>> +description: |
>> +  This is a part of device tree bindings for the BCM590XX family of power
>> +  management ICs.
>> +
>> +  See also Documentation/devicetree/bindings/mfd/brcm,bcm59056.yaml for
>> +  additional information and example.
>> +
>> +maintainers:
>> +  - Artur Weber <aweber.kernel@...il.com>
>> +
>> +# The valid regulator node names for BCM59056 are:
>> +#   rfldo, camldo1, camldo2, simldo1, simldo2, sdldo, sdxldo,
>> +#   mmcldo1, mmcldo2, audldo, micldo, usbldo, vibldo,
>> +#   csr, iosr1, iosr2, msr, sdsr1, sdsr2, vsr,
>> +#   gpldo1, gpldo2, gpldo3, gpldo4, gpldo5, gpldo6,
>> +#   vbus
> 
> patternProperties should define this. No need to repeat schema in
> freeform text.

IMO a full list is a bit easier to read than the regexes (another
suggestion was to move the list to the description [1]), but I don't
mind dropping it. For the most part, it's a carryover from the TXT
binding.

Best regards
Artur

[1] https://lore.kernel.org/lkml/Z59BQB_cBgTDm4ie@standask-GA-A55M-S2HP/