linux-kernel - Re: [PATCH 3/4] arm64: Juno: Add support for the PCIe host bridge on Juno R1

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Date:	Fri, 9 Oct 2015 15:11:07 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Rob Herring <robh@...nel.org>
Cc:	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mark Rutland <mark.rutland@....com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Robin Murphy <robin.murphy@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>, Jon Medhurst <tixy@...aro.org>,
	linux-pci <linux-pci@...r.kernel.org>,
	device-tree <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] arm64: Juno: Add support for the PCIe host bridge on
 Juno R1

On Fri, Oct 09, 2015 at 08:54:33AM -0500, Rob Herring wrote:
> On Fri, Oct 9, 2015 at 8:45 AM, Liviu Dudau <Liviu.Dudau@....com> wrote:
> > Juno R1 board sports a functional PCIe host bridge that is
> > compliant with the SBSA standard found here[1]. With the right
> > firmware that initialises the XpressRICH3 controller one can
> > use the generic Host Bridge driver to use the PCIe hardware.
> >
> > Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> >
> > [1] http://infocenter.arm.com/help/topic/com.arm.doc.den0029a/
> > ---
> >  arch/arm64/boot/dts/arm/juno-r1.dts | 20 ++++++++++++++++++++
> >  1 file changed, 20 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/arm/juno-r1.dts b/arch/arm64/boot/dts/arm/juno-r1.dts
> > index c627511..a702a6b 100644
> > --- a/arch/arm64/boot/dts/arm/juno-r1.dts
> > +++ b/arch/arm64/boot/dts/arm/juno-r1.dts
> > @@ -109,6 +109,26 @@
> >
> >         #include "juno-base.dtsi"
> >
> > +       pcie-controller@...00000 {
> > +               compatible = "pci-host-ecam-generic";
> 
> I think this is the first case of real h/w using this. We should have
> a specific compatible here additionally.

Or maybe I can claim the use of the string on account on being the first on arm64 ;)

I can add a vendor prefix if you want, but pci-host-generic is going to ignore it 
*because* it is trying to be a generic driver.

>  Perhaps the firmware did not setup something correctly.

Hope not :) I no longer have that much input into the UEFI firmware, but for U-Boot is
is all in the open and can be fixed at any time (?).

Thanks for reviewing this!

Best regards,
Liviu

> 
> > +               device_type = "pci";
> > +               reg = <0 0x40000000 0 0x10000000>;      /* ECAM config space */
> > +               bus-range = <0 255>;
> > +               linux,pci-domain = <0>;
> > +               #address-cells = <3>;
> > +               #size-cells = <2>;
> > +               dma-coherent;
> > +               ranges = <0x01000000 0x00 0x5f800000 0x00 0x5f800000 0x0 0x00800000
> > +                         0x02000000 0x00 0x50000000 0x00 0x50000000 0x0 0x08000000
> > +                         0x42000000 0x40 0x00000000 0x40 0x00000000 0x1 0x00000000>;
> > +               #interrupt-cells = <1>;
> > +               interrupt-map-mask = <0 0 0 7>;
> > +               interrupt-map = <0 0 0 1 &gic 0 0 0 136 4
> > +                                0 0 0 2 &gic 0 0 0 137 4
> > +                                0 0 0 3 &gic 0 0 0 138 4
> > +                                0 0 0 4 &gic 0 0 0 139 4>;
> > +               msi-parent = <&v2m_0>;
> > +       };
> >  };
> >
> >  &memtimer {
> > --
> > 2.6.0
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe devicetree" in
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> 

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