linux-kernel - RE: [PATCH 4/4] dt-bindings: pci: layerscape-pci: define aer/pme interrupts

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Date:   Tue, 30 Nov 2021 03:35:51 +0000
From:   Leo Li <leoyang.li@....com>
To:     Rob Herring <robh@...nel.org>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Z.Q. Hou" <zhiqiang.hou@....com>
Subject: RE: [PATCH 4/4] dt-bindings: pci: layerscape-pci: define aer/pme
 interrupts



> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: Monday, November 29, 2021 8:02 PM
> To: Leo Li <leoyang.li@....com>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>; linux-pci@...r.kernel.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; Z.Q. Hou
> <zhiqiang.hou@....com>
> Subject: Re: [PATCH 4/4] dt-bindings: pci: layerscape-pci: define aer/pme
> interrupts
> 
> On Fri, Nov 19, 2021 at 06:16:21PM -0600, Li Yang wrote:
> > Some platforms using this controller have separated interrupt lines
> > for aer or pme events instead of having a single interrupt line for
> > miscellaneous events.  Define interrupts in the binding for these
> > interrupt lines.
> >
> > Signed-off-by: Li Yang <leoyang.li@....com>
> > ---
> >  .../devicetree/bindings/pci/layerscape-pci.txt     | 14 ++++++++++----
> >  1 file changed, 10 insertions(+), 4 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/pci/layerscape-pci.txt
> > b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
> > index 8fd6039a826b..bcf11bfc4bab 100644
> > --- a/Documentation/devicetree/bindings/pci/layerscape-pci.txt
> > +++ b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
> > @@ -31,8 +31,13 @@ Required properties:
> >  - reg: base addresses and lengths of the PCIe controller register blocks.
> >  - interrupts: A list of interrupt outputs of the controller. Must contain an
> >    entry for each entry in the interrupt-names property.
> > -- interrupt-names: Must include the following entries:
> > -  "intr": The interrupt that is asserted for controller interrupts
> > +- interrupt-names: It could include the following entries:
> > +  "aer": For interrupt line reporting aer events when non MSI/MSI-X/INTx
> mode
> > +		is used
> > +  "pme": For interrupt line reporting pme events when non MSI/MSI-
> X/INTx mode
> > +		is used
> > +  "intr": For interrupt line reporting miscellaneous controller
> > +events
> > +  ......
> >  - fsl,pcie-scfg: Must include two entries.
> >    The first entry must be a link to the SCFG device node
> >    The second entry is the physical PCIe controller index starting from '0'.
> > @@ -52,8 +57,9 @@ Example:
> >  		reg = <0x00 0x03400000 0x0 0x00010000   /* controller
> registers */
> >  		       0x40 0x00000000 0x0 0x00002000>; /* configuration space
> */
> >  		reg-names = "regs", "config";
> > -		interrupts = <GIC_SPI 177 IRQ_TYPE_LEVEL_HIGH>; /*
> controller interrupt */
> > -		interrupt-names = "intr";
> > +		interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>, /* aer
> interrupt */
> > +			<GIC_SPI 177 IRQ_TYPE_LEVEL_HIGH>; /* pme
> interrupt */
> > +		interrupt-names = "aer", "pme";
> 
> This isn't a compatible change. The h/w suddenly has no 'intr'
> interrupt?

The original 'intr' was just a place holder for a HW interrupt signal without a clear definition of events associated.  Some later SoC has more interrupt signals to associate with more specific events.

If needed, we can keep the "intr" interrupt-name there just for backward compatibility although it was never used in Linux.

> 
> >  		fsl,pcie-scfg = <&scfg 0>;
> >  		#address-cells = <3>;
> >  		#size-cells = <2>;
> > --
> > 2.25.1
> >
> >