linux-kernel - Re: [RFC PATCH 2/3] dt-bindings: gpio: Add binding documentation for Etron EJ168/EJ188/EJ198

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Date:   Wed, 14 Oct 2020 07:43:43 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-pci <linux-pci@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [RFC PATCH 2/3] dt-bindings: gpio: Add binding documentation for
 Etron EJ168/EJ188/EJ198

On Tue, Oct 13, 2020 at 8:27 AM Linus Walleij <linus.walleij@...aro.org> wrote:
>
> On Wed, Oct 7, 2020 at 9:58 PM Martin Blumenstingl
> <martin.blumenstingl@...glemail.com> wrote:
> > On Wed, Oct 7, 2020 at 11:19 AM Linus Walleij <linus.walleij@...aro.org> wrote:
> > > On Sun, Oct 4, 2020 at 8:00 PM Martin Blumenstingl
> > > <martin.blumenstingl@...glemail.com> wrote:
> > >
> > > > +properties:
> > > > +  compatible:
> > > > +    enum:
> > > > +      - pci1b6f,7023
> > > > +      - pci1b6f,7052
> > >
> > > I think it is better to let the PCI driver for the whole hardware in
> > > drivers/usb/host/xhci-pci.c probe from the PCI configuration space
> > > numbers, and then add a gpio_chip to xhci-pci.c.
> >
> > to have everything consistent I will move the binding to
> > Documentation/devicetree/bindings/usb
>
> I do not understand why a PCI device would need a DT binding
> at all. They just probe from the magic number in the PCI
> config space, they spawn struct pci_dev PCI devices, not the
> type of platform devices coming out of the DT parser code.
> No DT compatible needed.

Same reason for all the discoverable buses need bindings. There can be
parts that are not discoverable or connections with non-discoverable
nodes. There's also cases where the discoverable device has to be
powered, reset deasserted, clocks enabled, etc. first to be
discovered.

If the GPIOs here had connections elsewhere in the DT, then we have to
describe the provider in DT.

Rob