From: Thierry Reding <thierry.reding@gmail.com>
To: Rob Herring <robh+dt@kernel.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Jon Hunter <jonathanh@nvidia.com>,
PCI <linux-pci@vger.kernel.org>,
linux-tegra <linux-tegra@vger.kernel.org>
Subject: Re: [PATCH v2 2/2] PCI: tegra: Remove PLL power supplies
Date: Mon, 27 Jul 2020 19:21:49 +0200 [thread overview]
Message-ID: <20200727172149.GA3683017@ulmo> (raw)
In-Reply-To: <CAL_Jsq+u=oFUAuURy-f8wCzagA-xKJES8RRf=kUSXJHoxOipBQ@mail.gmail.com>
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On Mon, Jul 27, 2020 at 10:21:42AM -0600, Rob Herring wrote:
> On Tue, Jun 23, 2020 at 8:55 AM Thierry Reding <thierry.reding@gmail.com> wrote:
> >
> > From: Thierry Reding <treding@nvidia.com>
> >
> > The Tegra PCI controller driver doesn't need to control the PLL power
> > supplies directly, but rather uses the pads provided by the XUSB pad
> > controller, which in turn is responsible for supplying power to the
> > PLLs.
> >
> > Signed-off-by: Thierry Reding <treding@nvidia.com>
> > ---
> > drivers/pci/controller/pci-tegra.c | 10 ++--------
> > 1 file changed, 2 insertions(+), 8 deletions(-)
>
> What's going to happen here with a new dtb and an old kernel? Is it
> going to error out due to missing supplies?
It's not going to error out but fallback to the "dummy" regulator, so
this should be fine from a forwards-compatibility point of view. Though
I didn't think we technically cared about that direction very much.
Thierry
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next prev parent reply other threads:[~2020-07-27 17:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-23 14:55 [PATCH v2 1/2] dt-bindings: pci: tegra: Remove PLL power supplies Thierry Reding
2020-06-23 14:55 ` [PATCH v2 2/2] PCI: " Thierry Reding
2020-07-16 13:00 ` Thierry Reding
2020-07-16 14:07 ` Lorenzo Pieralisi
2020-07-16 15:06 ` Thierry Reding
2020-07-27 16:21 ` Rob Herring
2020-07-27 17:21 ` Thierry Reding [this message]
2020-07-27 17:43 ` Rob Herring
2020-07-16 12:59 ` [PATCH v2 1/2] dt-bindings: pci: " Thierry Reding
2020-07-17 10:48 ` Lorenzo Pieralisi
2020-07-27 16:17 ` Rob Herring
2020-07-28 10:20 ` Lorenzo Pieralisi
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