From: Dustin Byford <dustin@cumulusnetworks.com>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Wolfram Sang <wsa@the-dreams.de>,
linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,
rjw@rjwysocki.net, linux-acpi@vger.kernel.org
Subject: Re: [RFC v2 0/1] i2c: acpi: scan ACPI enumerated I2C mux channels
Date: Mon, 17 Aug 2015 12:00:45 -0700 [thread overview]
Message-ID: <20150817190045.GA25318@cumulusnetworks.com> (raw)
In-Reply-To: <20150817120305.GB1552@lahna.fi.intel.com>
Hi Mika,
Thanks for taking a look.
On Mon Aug 17 15:03, Mika Westerberg wrote:
> On Fri, Aug 14, 2015 at 12:31:32PM -0700, Dustin Byford wrote:
> > Name (_DSD, Package ()
> > {
> > ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> > Package () {
> > Package (2) { "compatible", "nxp,pca9548" },
> > }
>
> Nice, you are using _DSD :-)
Yes, and I've got some other patches related to that. I'll keep
sending, but the relative youth of _DSD does bring up a few higher level
issues (for me at least). One thing at a time though, stay tuned.
> > I had to:
> >
> > 1) Find and set an ACPI companion for the "virtual" I2C adapters created
> > for each mux channel.
> >
> > 2) Make sure to scan adap.dev when registering devices under each mux
> > channel.
> I think the current code in I2C core is not actually doing the right
> thing according the ACPI spec at least. To my understanding you can have
> device with I2cSerialBus resource _anywhere_ in the namespace, not just
> directly below the host controller. It's the ResourceSource attribute
> that tells the corresponding host controller.
I think you're right.
> I wonder if it helps if we scan the whole namespace for devices with
> I2cSerialBus that matches the just registered adapter? Something like
> the patch below.
Looks reasonable to me. Let me work with the patch for a bit and see if
I can make it work in my system.
--Dustin
next prev parent reply other threads:[~2015-08-17 19:00 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-13 23:59 [RFC PATCH 0/1] i2c: scan ACPI enumerated I2C mux channels Dustin Byford
2015-08-13 23:59 ` [RFC PATCH 1/1] i2c: acpi: " Dustin Byford
2015-08-14 19:31 ` [RFC v2 0/1] " Dustin Byford
2015-08-14 19:31 ` [RFC v2 1/1] " Dustin Byford
2015-10-09 21:42 ` Wolfram Sang
2015-10-09 21:50 ` Dustin Byford
2015-10-09 21:51 ` Wolfram Sang
2015-08-15 20:22 ` [RFC v2 0/1] " Wolfram Sang
2015-08-17 12:03 ` Mika Westerberg
2015-08-17 19:00 ` Dustin Byford [this message]
2015-10-10 0:41 ` [PATCH 0/2] " Dustin Byford
2015-10-10 0:41 ` [PATCH 1/2] i2c: scan entire ACPI namespace for I2C connections Dustin Byford
2015-10-12 10:46 ` Mika Westerberg
2015-10-12 11:20 ` Andy Shevchenko
2015-10-12 17:00 ` Dustin Byford
2015-10-12 19:01 ` Rafael J. Wysocki
2015-10-12 18:57 ` Dustin Byford
2015-10-10 0:41 ` [PATCH 2/2] i2c: add ACPI support for I2C mux ports Dustin Byford
2015-10-10 1:03 ` kbuild test robot
2015-10-12 10:50 ` Mika Westerberg
2015-10-12 18:32 ` Dustin Byford
2015-10-13 11:32 ` Mika Westerberg
2015-10-19 9:01 ` [PATCH v2 0/1] i2c: acpi: scan ACPI enumerated I2C mux channels Dustin Byford
2015-10-19 22:28 ` [PATCH v3 " Dustin Byford
2015-10-19 22:29 ` [PATCH v3 1/1] i2c: add ACPI support for I2C mux ports Dustin Byford
2015-10-20 9:16 ` Andy Shevchenko
2015-10-20 12:51 ` Mika Westerberg
2015-10-20 17:49 ` Dustin Byford
2015-10-20 23:13 ` Rafael J. Wysocki
2015-10-21 8:12 ` Mika Westerberg
2015-10-21 8:21 ` Dustin Byford
2015-10-21 8:34 ` Mika Westerberg
2015-10-21 8:52 ` Dustin Byford
2015-10-21 9:08 ` Mika Westerberg
2015-10-21 9:25 ` Dustin Byford
2015-10-21 22:39 ` Rafael J. Wysocki
2015-10-22 9:27 ` Dustin Byford
2015-10-20 23:12 ` Rafael J. Wysocki
2015-10-21 8:02 ` Mika Westerberg
2015-10-22 9:17 ` [PATCH v4 0/2] i2c: acpi: scan ACPI enumerated I2C mux channels Dustin Byford
2015-10-22 9:17 ` [PATCH v4 1/2] acpi: add acpi_preset_companion() stub Dustin Byford
2015-10-23 8:33 ` Mika Westerberg
2015-10-25 13:40 ` Rafael J. Wysocki
2015-10-25 15:01 ` Rafael J. Wysocki
2015-10-22 9:17 ` [PATCH v4 2/2] i2c: add ACPI support for I2C mux ports Dustin Byford
2015-10-23 8:40 ` Mika Westerberg
2015-10-23 10:16 ` Wolfram Sang
2015-10-23 13:13 ` Mika Westerberg
2015-10-23 13:40 ` Mika Westerberg
2015-10-23 13:55 ` Jarkko Nikula
2015-10-23 19:27 ` [PATCH v5 0/2] i2c: acpi: scan ACPI enumerated I2C mux channels Dustin Byford
2015-10-23 19:27 ` [PATCH v5 1/2] acpi: add acpi_preset_companion() stub Dustin Byford
2015-10-24 16:41 ` Wolfram Sang
2015-10-25 15:00 ` Rafael J. Wysocki
2015-10-23 19:27 ` [PATCH v5 2/2] i2c: add ACPI support for I2C mux ports Dustin Byford
2015-10-25 14:53 ` [PATCH v5 0/2] i2c: acpi: scan ACPI enumerated I2C mux channels Wolfram Sang
2015-10-25 15:15 ` Dustin Byford
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