linux-kernel - Re: [RFC PATCH 2/2] PCI: exynos: Add PCIe support for Samsung GH7 SoC

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Date:	Tue, 22 Apr 2014 16:11:39 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Jingoo Han <jg1.han@...sung.com>
Cc:	"'linux-pci'" <linux-pci@...r.kernel.org>,
	"'Bjorn Helgaas'" <bhelgaas@...gle.com>,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	"'Liviu Dudau'" <Liviu.Dudau@....com>,
	"'Kukjin Kim'" <kgene.kim@...sung.com>
Subject: Re: [RFC PATCH 2/2] PCI: exynos: Add PCIe support for Samsung GH7 SoC

On Wednesday 16 April 2014, Jingoo Han wrote:
> Samsung GH7 has four PCIe controllers which can be used as root
> complex for PCIe interface.
> 
> Signed-off-by: Jingoo Han <jg1.han@...sung.com>
> ---
>  drivers/pci/host/Kconfig      |    2 +-
>  drivers/pci/host/pci-exynos.c |  135 ++++++++++++++++++++++++++++++++++++++---
>  2 files changed, 126 insertions(+), 11 deletions(-)

Can you explain how much the GH7 and Exynos front-ends actually have in
common? Would it make sense to have a separate driver for gh7?

Also, if gh7 is expected to run a full firmware, I think you should
do all the setup in the firmware before booting Linux, and just
do the required run-time operations in the driver itself.

	Arnd
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