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 [PATCH 00/26] STA2X11 devicetree support for amba/pci 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5202C4C3.6050007@zytor.com \
--to=hpa@zytor.com \
--cc=ciminaghi@gnudd.com \
--cc=devicetree@vger.kernel.org \
--cc=giancarlo.asnaghi@st.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@arm.linux.org.uk \
--cc=mingo@redhat.com \
--cc=rubini@gnudd.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.