From: Stephen Warren <swarren@wwwdotorg.org>
To: Timur Tabi <timur@freescale.com>
Cc: alsa-devel@alsa-project.org, broonie@opensource.wolfsonmicro.com,
lrg@ti.com, Daniel Mack <zonque@gmail.com>
Subject: Re: [PATCH 1/2] ALSA: ASoC: add DT bindings for cs4270
Date: Tue, 24 Jul 2012 16:00:37 -0600 [thread overview]
Message-ID: <500F1B05.3050107@wwwdotorg.org> (raw)
In-Reply-To: <500F05CC.2000105@freescale.com>
On 07/24/2012 02:30 PM, Timur Tabi wrote:
> Daniel Mack wrote:
>> How do you instanciate it then? Somehow the DT core must know which
>> device to probe for a node, right?
>
> drivers/of/of_i2c.c
>
> It scans the device tree looking for I2C devices and registers them.
The I2C code matches the compatible values from the device tree against
two tables in the kernel. First, the of_match_table that this patch
adds, and then if there's no match it falls back to the I2C device ID
table, and matches that against the DT compatible value with the vendor
prefix stripped off.
So while the second method does work as a fall-back, in the past I've
received guidance (I think from Grant Likely) that we should still add
the of_match_table to drivers in order to be explicit.
next prev parent reply other threads:[~2012-07-24 22:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-24 20:20 [PATCH 1/2] ALSA: ASoC: add DT bindings for cs4270 Daniel Mack
2012-07-24 20:20 ` [PATCH 2/2] ALSA: ASoC: Add reset-gpio DT property to cs4270 driver Daniel Mack
2012-07-24 20:22 ` [PATCH 1/2] ALSA: ASoC: add DT bindings for cs4270 Timur Tabi
2012-07-24 20:26 ` Daniel Mack
2012-07-24 20:30 ` Timur Tabi
2012-07-24 20:32 ` Daniel Mack
2012-07-24 20:39 ` Timur Tabi
2012-07-24 20:53 ` Daniel Mack
2012-07-24 21:01 ` Timur Tabi
2012-07-25 6:19 ` Daniel Mack
2012-07-24 22:01 ` Stephen Warren
2012-07-24 22:02 ` Timur Tabi
2012-07-24 22:42 ` Mark Brown
2012-07-24 22:41 ` Mark Brown
2012-07-24 22:00 ` Stephen Warren [this message]
2012-07-24 22:03 ` Timur Tabi
2012-07-24 22:44 ` Mark Brown
2012-07-25 6:12 ` Daniel Mack
2012-07-25 7:03 ` [PATCH 2/2 v2] ALSA: ASoC: Add reset-gpio DT property to cs4270 driver Daniel Mack
2012-07-25 13:18 ` Mark Brown
2012-07-25 13:22 ` Daniel Mack
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