linux-kernel - Re: [PATCH v1 2/6] PCI: brcmstb: Add control of EP voltage regulator(s)

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Message-ID: <20201126114912.GA8506@sirena.org.uk>
Date:   Thu, 26 Nov 2020 11:49:12 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Jim Quinlan <james.quinlan@...adcom.com>
Cc:     linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        bcm-kernel-feedback-list@...adcom.com,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Liam Girdwood <lgirdwood@...il.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 v1 2/6] PCI: brcmstb: Add control of EP voltage
 regulator(s)

On Wed, Nov 25, 2020 at 02:24:19PM -0500, Jim Quinlan wrote:

> +	for (i = 0; i < PCIE_REGULATORS_MAX; i++) {
> +		ep_reg = devm_regulator_get_optional(dev, ep_regulator_names[i]);
> +		if (IS_ERR(ep_reg)) {

Does PCI allow supplies to be physically absent?  If not then the driver
shouldn't be using regulator_get_optional() and much of the code here
can be deleted.

> +static void brcm_set_regulators(struct brcm_pcie *pcie, bool on)
> +{

This is open coding the regulator bulk APIs.

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