linux-kernel - Re: [PATCH v5 4/6] PCI: brcmstb: Add control of subdevice voltage regulators

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Date:   Fri, 22 Oct 2021 15:31:32 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jim Quinlan <jim2101024@...il.com>
Cc:     linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Rob Herring <robh@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 4/6] PCI: brcmstb: Add control of subdevice voltage
 regulators

On Fri, Oct 22, 2021 at 10:06:57AM -0400, Jim Quinlan wrote:

> +static const char * const supplies[] = {
> +	"vpcie3v3-supply",
> +	"vpcie3v3aux-supply",
> +	"brcm-ep-a-supply",
> +	"brcm-ep-b-supply",
> +};

Why are you including "-supply" in the names here?  That will lead to
a double -supply when we look in the DT which probably isn't what you're
looking for.

Also are you *sure* that the device has supplies with names like
"brcm-ep-a"?  That seems rather unidiomatic for electrical engineering,
the names here are supposed to correspond to the names used in the
datasheet for the part.

> +	/* This is for Broadcom STB/CM chips only */
> +	if (pcie->type == BCM2711)
> +		return 0;

It is a relief that other chips have managed to work out how to avoid
requiring power.

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