From: Timur Tabi <timur@freescale.com>
To: Jon Smirl <jonsmirl@gmail.com>
Cc: PowerPC dev list <Linuxppc-dev@ozlabs.org>
Subject: Re: Device trees and audio codecs
Date: Mon, 22 Oct 2007 10:40:17 -0500 [thread overview]
Message-ID: <471CC461.1080207@freescale.com> (raw)
In-Reply-To: <9e4733910710211729k2f2a065cm56670d1b0f90a1af@mail.gmail.com>
Jon Smirl wrote:
> I meant an ac97 bus. ac97 is conceptually the same as i2s with the
> control signals also routed over it. ac97 and i2s are handled in the
> same PSC on the 5200.
>
> I have received conflicting opinions as to whether a codec hooked to
> an ac97 bus should get a chip specific codec entry in the device tree.
I think it should. For one thing, ASoC requires a pointer to a structure in the
codec device driver so that it knows which functions to call to change volume.
What if you have multiple i2s/ac97 devices and multiple codecs? You'll need to
know which i2s device is connected to which codec. The only way to distinguish
that is by having a node for the codec under the i2s node.
next prev parent reply other threads:[~2007-10-22 15:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-20 15:33 Device trees and audio codecs Jon Smirl
2007-10-21 13:33 ` Timur Tabi
2007-10-21 14:01 ` Jon Smirl
2007-10-22 13:07 ` Timur Tabi
2007-10-23 19:12 ` Scott Wood
2007-10-21 19:14 ` Segher Boessenkool
2007-10-21 21:33 ` Jon Smirl
2007-10-21 22:06 ` Benjamin Herrenschmidt
2007-10-21 22:12 ` Jon Smirl
2007-10-21 22:19 ` Benjamin Herrenschmidt
2007-10-21 23:33 ` Segher Boessenkool
2007-10-22 0:29 ` Jon Smirl
2007-10-22 15:40 ` Timur Tabi [this message]
2007-10-22 18:43 ` Segher Boessenkool
2007-10-23 3:24 ` Grant Likely
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