linux-kernel - Re: [PATCH v3 3/7] PCI: imx6: Fix the regulator dump when link never came up

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Message-ID: <20211026094845.GC87230@francesco-nb.int.toradex.com>
Date:   Tue, 26 Oct 2021 11:48:45 +0200
From:   Francesco Dolcini <francesco.dolcini@...adex.com>
To:     Richard Zhu <hongxing.zhu@....com>
Cc:     Francesco Dolcini <francesco.dolcini@...adex.com>,
        Mark Brown <broonie@...nel.org>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: Re: [PATCH v3 3/7] PCI: imx6: Fix the regulator dump when link never
 came up

On Tue, Oct 26, 2021 at 09:18:39AM +0000, Richard Zhu wrote:
> > Isn't this something that depend on the actual board design? From the driver
> > point of view you should not silently enforce such design requirement on the
> > board.
> > Am I missing something here? Would be glad to you if you can clarify in case.
> > 
> [Richard Zhu] Yes, it is relied on the actual HW board design.
> This regulator is one optional, not mandatory required for all the board designs.
> So, there is one _enabled or not check before manipulate this regulator.
I think I was not clear in my question.

I'm asking what's is going to happen if the vpci-e supply is used in the
actual board design AND the same regulator is shared with another device (to my
understanding this should be just fine from the regulator API
point of view, correct me if I'm wrong).

I'm not talking about board designed by NXP in which such use case might not
exist.

Francesco