linux-kernel - Re: [PATCH V2] pci: exynos: split into two parts such as Synopsys part and Exynos part

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Date:	Thu, 11 Jul 2013 16:05:50 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Kishon Vijay Abraham I' <kishon@...com>
Cc:	'Bjorn Helgaas' <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Pratyush Anand' <pratyush.anand@...com>,
	'Mohit KUMAR' <Mohit.KUMAR@...com>,
	'Arnd Bergmann' <arnd@...db.de>,
	'Sean Cross' <xobs@...agi.com>,
	'SRIKANTH TUMKUR SHIVANAND' <ts.srikanth@...sung.com>,
	linux-kernel@...r.kernel.org, Seungwon Jeon <tgih.jun@...sung.com>,
	'Yulgon Kim' <yulgon.kim@...sung.com>,
	Jingoo Han <jg1.han@...sung.com>
Subject: Re: [PATCH V2] pci: exynos: split into two parts such as Synopsys part
 and Exynos part

On Thursday, July 11, 2013 3:40 PM, Kishon Vijay Abraham I wrote:
> On Thursday 11 July 2013 11:19 AM, Jingoo Han wrote:
> >
> >  drivers/pci/host/Makefile          |    1 +
> >  drivers/pci/host/pcie-designware.c |  963 +++++++++---------------------------
> >  drivers/pci/host/pcie-designware.h |   71 +++
> >  drivers/pci/host/pcie-exynos.c     |  523 ++++++++++++++++++++
> >  4 files changed, 822 insertions(+), 736 deletions(-)
> >  create mode 100644 drivers/pci/host/pcie-designware.h
> >  create mode 100644 drivers/pci/host/pcie-exynos.c
> >
> > diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> > index 086d850..7e59864 100644
> > --- a/drivers/pci/host/Makefile
> > +++ b/drivers/pci/host/Makefile
> > @@ -1,2 +1,3 @@
> >  obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
> >  obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> > +obj-$(CONFIG_PCI_EXYNOS) += pcie-exynos.o
> > diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
[...]
> 
> How about making this a separate driver in itself that does all the
> configurations for designware core? By this I mean we can have a separate dt
> node (child node of soc specific wrapper), that will have all the configuration
> space/IO space and memory space. pci_common_init/dw_pcie_host_init should be
> done in this driver.
> We just need to think about a way of passing the ops (since that looks like
> very much needed because of the sideband bits you have to enable before
> reading/writing).
> 

CC'ed Seungwon Jeon(DW-MMC Maintainer), Yulgon Kim (DW-USB Developer)


Um, maybe you mean dwc3 usb driver (./drivers/usb/dwc3/)'?

But, I referenced dw mmc driver (./drivers/mmc/host/dw_mmc*.c).

Now, Exynos PCIe driver, Spear PCIe driver[1], and i.MX PCIe driver[2]
are submitted to PCIe mailing-list, these are using designware PCIe core.

There are many differences between Exynos PCIe and Spear PCIe.
Also, for Exynos PCIe, platform specific part will be changed more.

Thus, the dw mmc driver model looked more suitable.


[1] http://permalink.gmane.org/gmane.linux.kernel.pci/18400
[2] http://www.spinics.net/lists/linux-pci/msg23489.html


Best regards,
Jingoo Han


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