linux-kernel - Re: [PATCH v4 2/2] pci:aer: add support aer interrupt with none MSI/MSI-X/INTx mode

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Date:   Fri, 2 Sep 2016 10:17:25 -0500
From:   Rob Herring <robh@...nel.org>
To:     Po Liu <po.liu@....com>
Cc:     linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Roy Zang <roy.zang@....com>, Mingkai Hu <mingkai.hu@....com>,
        Stuart Yoder <stuart.yoder@....com>,
        Yang-Leo Li <leoyang.li@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Minghuan Lian <minghuan.lian@....com>,
        Murali Karicheri <m-karicheri2@...com>
Subject: Re: [PATCH v4 2/2] pci:aer: add support aer interrupt with none
 MSI/MSI-X/INTx mode

On Wed, Aug 31, 2016 at 02:37:22PM +0800, Po Liu wrote:
> On some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode.
> When chip support the aer interrupt with none MSI/MSI-X/INTx mode,
> maybe there is interrupt line for aer pme etc. Search the interrupt
> number in the fdt file. Then fixup the dev->irq with it.
> 
> Signed-off-by: Po Liu <po.liu@....com>
> ---
> Changes for v4:
> 	- re-use the patch changes in the root port driver;
> 	- add binding information;
> 
>  .../devicetree/bindings/pci/layerscape-pci.txt     |  4 +--
>  drivers/pci/pcie/portdrv_core.c                    | 31 +++++++++++++++++++---
>  2 files changed, 30 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/layerscape-pci.txt b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
> index 41e9f55..1dfb1da 100644
> --- a/Documentation/devicetree/bindings/pci/layerscape-pci.txt
> +++ b/Documentation/devicetree/bindings/pci/layerscape-pci.txt
> @@ -19,7 +19,7 @@ Required properties:
>  - 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
> +  "aer": The interrupt that is asserted for aer interrupts

You can't just change this. That breaks compatibility with old dts 
files. Plus, it is just a name. Why does it even matter? Not to mention 
having the name for a single irq is a bit pointless.

Rob