linux-kernel - Voltage and current regulator: usage of 'regulators' parent node in device tree

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Date:   Wed, 7 Jul 2021 13:09:25 +0000
From:   "embedded (VIVAVIS AG)" <embedded@...avis.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "broonie@...nel.org" <broonie@...nel.org>
Subject: Voltage and current regulator: usage of 'regulators' parent node in
 device tree

I see a lot of Devicetrees wrapping the regulator nodes within a parent node
like this

regulators {
    compatible = "simple-bus";
    #address-cells = <1>;
    #size-cells = <0>;
    reg_p3v3: regulator@0 {
        compatible = "regulator-fixed";
        [...]
        regulator-always-on;
    };
    [...]

Contrary to that, patches exist removing the 'regulators' node, because the 'simple-bus'
doesn't really exist in hardware. Unfortunately, the documentation is unclear about
wrapping regulator nodes like shown above.

Should I avoid the parent 'regulators' node?

Is the given naming schema in fixed-regulator.yaml best practice to follow?

    reg_xyz: regulator-xyz {
      compatible = "regulator-fixed";
      regulator-name = "xyz";

Thank you for clarification.

Carsten Stelling