From: "H. Peter Anvin" <hpa@zytor.com>
To: Alessandro Rubini <rubini@gnudd.com>
Cc: linux-kernel@vger.kernel.org, ciminaghi@gnudd.com,
giancarlo.asnaghi@st.com, x86@kernel.org, mingo@redhat.com,
linux@arm.linux.org.uk, tglx@linutronix.de,
devicetree@vger.kernel.org
Subject: Re: [PATCH 00/26] STA2X11 devicetree support for amba/pci
Date: Wed, 07 Aug 2013 15:05:55 -0700 [thread overview]
Message-ID: <5202C4C3.6050007@zytor.com> (raw)
In-Reply-To: <20130807211235.GA17863@mail.gnudd.com>
On 08/07/2013 02:12 PM, Alessandro Rubini wrote:
>
> I understand. My impression of devicetree is exactly like that, I must
> say. What we have here is a very clean PCI enumeration of it all: we
> only need to specify the mapping of GPIO pins (i.e. card-detect for
> mmc) and DMA channels, as all the rest works by itself.
>
Could you elucidate this a bit more? Specifically, from the PCI host's
perspective, how do you know what you are dealing with (presumably PCI
VID:DID:SVID:SID?) How exactly does the mapping of PCI BARs and
INT/MSI/MSI-X channels to the slave device play in?
I think it is safe to say that the device models we have today simply
don't account for this kind of usage, which, as you say, is a genuine
problem, and I think we need to understand the problem space better in
order to properly architect the solution, as I don't think we have one
right now.
-hpa
next prev parent reply other threads:[~2013-08-07 22:06 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-07 10:16 Alessandro Rubini
2013-08-07 10:16 ` [PATCH 01/26] x86: fix warning for sta2x11 Alessandro Rubini
2013-08-07 10:16 ` [PATCH 02/26] DMA: PL330: use prefix in reg names to build under x86 Alessandro Rubini
2013-08-07 10:16 ` [PATCH 03/26] mmc: Use the new <linux/sizes.h> Alessandro Rubini
2013-08-07 10:17 ` [PATCH 04/26] x86: add CONFIG_ARM_AMBA, selected by STA2X11 Alessandro Rubini
2013-08-07 10:17 ` [PATCH 05/26] drivers/amba: add support for a PCI bridge Alessandro Rubini
2013-08-07 10:17 ` [PATCH 06/26] x86 STA2X11: select devicetree related config items Davide Ciminaghi
2013-08-07 10:17 ` [PATCH 07/26] OF platform: export of_amba_device_create() Davide Ciminaghi
2013-08-07 10:17 ` [PATCH 08/26] OF platform, of_amba_device_create(): add parent resource to parameters Davide Ciminaghi
2013-08-07 10:17 ` [PATCH 09/26] kernel irqdomain: export irq_domain_disassociate() Davide Ciminaghi
2013-08-07 10:19 ` [PATCH 10/26] x86 devicetree: add irq domain for msi irqs Davide Ciminaghi
2013-08-07 10:19 ` [PATCH 11/26] x86 devicetree: add functions for handling setup/teardown of MSI irqs Davide Ciminaghi
2013-08-07 10:19 ` [PATCH 12/26] x86 kernel apic: notify MSI irqdomain(s) on etup/teardown of MSI IRQs Davide Ciminaghi
2013-08-07 10:19 ` [PATCH 13/26] drivers/amba/pci-amba.c: use devicetree for amba device creation Davide Ciminaghi
2013-08-07 10:19 ` [PATCH 14/26] gpio: remove sta2x11-gpio Davide Ciminaghi
2013-08-07 19:49 ` Linus Walleij
2013-08-07 10:20 ` [PATCH 15/26] x86 STA2X11: remove the sta2x11-mfd driver Davide Ciminaghi
2013-08-07 10:20 ` [PATCH 16/26] x86 STA2X11 platform: add sta2x11_platform_init() Davide Ciminaghi
2013-08-07 10:20 ` [PATCH 17/26] x86 STA2X11 platform: add sta2x11_instance_data helpers Davide Ciminaghi
2013-08-07 10:20 ` [PATCH 18/26] x86 STA2X11 platform: add a common probe function for platform devices Davide Ciminaghi
2013-08-07 10:20 ` [PATCH 19/26] x86 STA2X11 platform: create sta2x11-clock-regs device Davide Ciminaghi
2013-08-07 10:20 ` [PATCH 20/26] x86 STA2X11 platform: remove useless pr_info()'s Davide Ciminaghi
2013-08-07 10:21 ` [PATCH 21/26] AMBA: pci-amba bridge: improve code readability Davide Ciminaghi
2013-08-07 10:21 ` [PATCH 22/26] AMBA: pci-amba bridge: extend number of amba devs per pci device Davide Ciminaghi
2013-08-07 10:21 ` [PATCH 23/26] AMBA: pci-amba bridge: export function creating pci-amba device names Davide Ciminaghi
2013-08-07 10:21 ` [PATCH 24/26] x86 STA2X11: add dts for Intel's Northville board Davide Ciminaghi
2013-08-07 10:21 ` [PATCH 25/26] drivers/clk: sta2x11 common clock framework implementation Davide Ciminaghi
2013-08-07 10:22 ` [PATCH 26/26] pinctrl: add support for sta2x11 (via pinctrl-nomadik) Davide Ciminaghi
2013-08-07 19:47 ` Linus Walleij
2013-08-07 20:43 ` Alessandro Rubini
2013-08-07 15:41 ` [PATCH 00/26] STA2X11 devicetree support for amba/pci H. Peter Anvin
2013-08-07 21:12 ` Alessandro Rubini
2013-08-07 21:15 ` H. Peter Anvin
2013-08-07 22:05 ` H. Peter Anvin [this message]
2013-08-07 22:12 ` H. Peter Anvin
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