linux-kernel - Re: [PATCH 3/5] PCI: rcar: Add R-Car PCIe endpoint device tree bindings

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Date:   Fri, 8 Nov 2019 09:36:56 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Magnus Damm <magnus.damm@...il.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        linux-pci <linux-pci@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Murray <andrew.murray@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        "Lad, Prabhakar" <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 3/5] PCI: rcar: Add R-Car PCIe endpoint device tree bindings

Hi Prabhakar,

On Thu, Nov 7, 2019 at 11:46 PM Lad, Prabhakar
<prabhakar.csengg@...il.com> wrote:
> On Thu, Nov 7, 2019 at 8:08 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > On Thu, Nov 7, 2019 at 10:26 AM Lad, Prabhakar
> > <prabhakar.csengg@...il.com> wrote:
> > > On Thu, Nov 7, 2019 at 8:44 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > > On Wed, Nov 6, 2019 at 8:36 PM Lad Prabhakar <prabhakar.csengg@...il.com> wrote:
> > > > > From: "Lad, Prabhakar" <prabhakar.mahadev-lad.rj@...renesas.com>
> > > > >
> > > > > This patch adds the bindings for the R-Car PCIe endpoint driver.
> > > > >
> > > > > Signed-off-by: Lad, Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > >
> > > > > --- /dev/null
> > > > > +++ b/Documentation/devicetree/bindings/pci/rcar-pci-ep.txt

> > > > > +- reg: Five register ranges as listed in the reg-names property
> > > > > +- reg-names: Must include the following names
> > > > > +       - "apb-base"
> > > > > +       - "memory0"
> > > > > +       - "memory1"
> > > > > +       - "memory2"
> > > > > +       - "memory3"
> > > >
> > > > What is the purpose of the last 4 regions?
> > > > Can they be chosen by the driver, at runtime?
> > > >
> > > no the driver cannot choose them at runtime, as these are the only
> > > PCIE memory(0/1/2/3) ranges
> > > in the AXI address space where host memory can be mapped.
> >
> > Are they fixed by the PCIe hardware, i.e. could they be looked up by the
> > driver based on the compatible value?
> >
> yes they are fixed by the PCIe hardware and could be looked up by the driver
> based on the compatible value.

Thanks, so we don't need to describe them in DT.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds