linux-kernel - Re: [PATCH v2 3/5] PCI: st: Provide support for the sti PCIe controller

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Message-ID: <55093C12.7070004@st.com>
Date:	Wed, 18 Mar 2015 09:49:22 +0100
From:	Fabrice Gasnier <fabrice.gasnier@...com>
To:	Paul Bolle <pebolle@...cali.nl>,
	Gabriel FERNANDEZ <gabriel.fernandez@...com>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Maxime Coquelin <maxime.coquelin@...com>,
	Patrice Chotard <patrice.chotard@...com>,
	Russell King <linux@....linux.org.uk>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mohit Kumar <mohit.kumar@...com>,
	Jingoo Han <jg1.han@...sung.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Kishon Vijay Abraham I <kishon@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Greg KH <gregkh@...uxfoundation.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Joe Perches <joe@...ches.com>, Tejun Heo <tj@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Thierry Reding <treding@...dia.com>,
	Phil Edworthy <phil.edworthy@...esas.com>,
	Minghuan Lian <Minghuan.Lian@...escale.com>,
	Tanmay Inamdar <tinamdar@....com>, <m-karicheri2@...com>,
	Sachin Kamat <sachin.kamat@...sung.com>,
	Andrew Lunn <andrew@...n.ch>,
	Liviu Dudau <liviu.dudau@....com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <kernel@...inux.com>,
	<linux-pci@...r.kernel.org>, Lee Jones <lee.jones@...aro.org>,
	Gabriel Fernandez <gabriel.fernandez@...aro.org>
Subject: Re: [PATCH v2 3/5] PCI: st: Provide support for the sti PCIe controller

Hi Paul,

On 03/16/2015 04:11 PM, Paul Bolle wrote:
>> +config PCI_ST
>> +	bool "ST PCIe controller"
> You add a bool Kconfig symbol. A week or two ago I saw some patches fly
> by that - I think - allowed PCIe controllers to be built modular.

Thanks for your review.

Are you talking about "PCI: Export symbols of PCI functions" patch, that 
is part of a series
named "pci: iproc: Add Broadcom iProc PCIe support" ?

This controller doesn't look like to be based on pcie-designware core 
driver.
Other vendors that are using "pcie-designware" core driver are also make 
it bool.
The current core driver doesn't support module loading/unloading as I 
see it.
If this is required, I also think this should be part of another patchset.

What do you think ?

Please advise,
BR,
Fabrice
>
>> +	depends on ARCH_STI || (ARM && COMPILE_TEST)
>> +	select PCIE_DW
>> +	help
>> +	  Enable PCIe controller support on ST Socs. This controller is based
>> +	  on Designware hardware and therefore the driver re-uses the
>> +	  Designware core functions to implement the driver.
>> --- a/drivers/pci/host/Makefile
>> +++ b/drivers/pci/host/Makefile
>> +obj-$(CONFIG_PCI_ST) += pci-st.o
> If you keep that symbol bool this objectfile will never be part of a
> module.
>
>> diff --git a/drivers/pci/host/pci-st.c b/drivers/pci/host/pci-st.c
>> new file mode 100644
>> index 0000000..470000d
>> --- /dev/null
>> +++ b/drivers/pci/host/pci-st.c
>> +#include <linux/module.h>
> For built-in code this include is, probably, not needed.
>
>> +MODULE_DEVICE_TABLE(of, st_pcie_of_match);
> For built-in code that macro will always be preprocessed away.
>
>> +/* ST PCIe driver does not allow module unload */
>> +static int __init pcie_init(void)
>> +{
>> +	return platform_driver_probe(&st_pcie_driver, st_pcie_probe);
>> +}
>> +device_initcall(pcie_init);
> I think the module unload comment is a bit odd for built-in only code.
>
>> +MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@...com>");
>> +MODULE_DESCRIPTION("PCI express Driver for ST SoCs");
>> +MODULE_LICENSE("GPL v2");
> These three macros will be, basically, always preprocessed away as long
> as this code can't be built to be modular.
>
>
> Paul Bolle
>

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