linux-kernel - Re: [PATCH v4 3/6] PCI: brcmstb: Add control of slot0 device voltage regulators

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Date:   Tue, 6 Apr 2021 12:59:16 -0400
From:   Jim Quinlan <jim2101024@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-pci <linux-pci@...r.kernel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Rob Herring <robh@...nel.org>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...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 v4 3/6] PCI: brcmstb: Add control of slot0 device voltage regulators

On Tue, Apr 6, 2021 at 12:34 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Thu, Apr 01, 2021 at 05:21:43PM -0400, Jim Quinlan wrote:
>
> > +     /* Look for specific pcie regulators in the RC DT node. */
> > +     for_each_property_of_node(np, pp) {
> > +             for (i = 0; i < ns; i++)
> > +                     if (strcmp(supplies[i], pp->name) == 0)
>
> This is broken, the driver knows which supplies are expected, the device
> can't function without these supplies so the driver should just
> unconditionally request them like any other supply.

Hi  Mark,
Some boards require the regulators, some do not.  So the driver is
only  sure what the names may be if they are present.  If  I put these
names in my struct regulator_bulk_data array and do a
devm_regulator_bulk_get(), I will get the following for the boards
that do not need the regulators (e.g. the RPi SOC):

[    6.823820] brcm-pcie xxx.pcie: supply vpcie12v-supply not found,
using dummy regulator
[    6.832265] brcm-pcie xxx.pcie: supply vpcie3v3-supply not found,
using dummy regulator

IIRC you consider this a debug feature?  Be that as it may, these
lines will confuse our customers and I'd like that they not be printed
if possible.

So I ask you to allow the code as is.  If you still insist, I will
change and resubmit.

Regards,
Jim Quinlan
Broadcom STB