linux-kernel - Re: [PATCH 4/6] pci: altera: Add Altera PCIe MSI driver

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Date:	Tue, 28 Jul 2015 22:38:07 -0500
From:	Dinh Nguyen <dinh.linux@...il.com>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	linux-pci@...r.kernel.org,
	Linux List <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/6] pci: altera: Add Altera PCIe MSI driver

On Tue, Jul 28, 2015 at 10:07 PM, Ley Foon Tan <lftan@...era.com> wrote:
> On Wed, Jul 29, 2015 at 1:00 AM, Dinh Nguyen <dinh.linux@...il.com> wrote:
>> On Tue, Jul 28, 2015 at 5:45 AM, Ley Foon Tan <lftan@...era.com> wrote:
>>> This patch adds Altera PCIe MSI driver. This soft IP supports configurable
>>> number of vectors, which is a dts parameter.
>>> @@ -154,4 +154,11 @@ config PCIE_ALTERA
>>>           Say Y here if you want to enable PCIe controller support for Altera
>>>           SoCFPGA family of SoCs.
>>>
>>> +config PCIE_ALTERA_MSI
>>> +       bool "Altera PCIe MSI feature"
>>> +       depends on PCI_MSI && PCIE_ALTERA
>>> +       help
>>> +         Say Y here if you want PCIe MSI support for the Altera SocFPGA SoC.
>>> +         This MSI driver supports Altera MSI to GIC controller IP.
>>> +
>>
>> Couldn't this driver get combined with the pcie-altera driver?
>
> This MSI IP is a soft IP and it is optional to PCI system. So, we have
> individual driver for it and user can disable it.
>

So why can't you use CONFIG_PCI_MSI in the pcie-altera driver? I see
that most, if not
all of the other drivers are combined with MSI.

Dinh
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