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

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Date:   Tue, 13 Oct 2020 15:27:10 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     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>,
        Rob Herring <robh+dt@...nel.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 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.

What am I not understanding about this?

Yours,
Linus Walleij