From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> To: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Cc: Jean-Francois Moine <moinejf@free.fr>, Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org, Russell King <linux@arm.linux.org.uk>, Jason Cooper <jason@lakedaemon.net>, Pawel Moll <pawel.moll@arm.com>, Stephen Warren <swarren@wwwdotorg.org>, linux-kernel@vger.kernel.org, Rob Herring <rob.herring@calxeda.com>, Gregory CLEMENT <gregory.clement@free-electrons.com>, linux-arm-kernel@lists.infradead.org, Ian Campbell <ian.campbell@citrix.com> Subject: Re: [PATCH 1/2] ARM: Dove: Add the audio devices in DT Date: Wed, 28 Aug 2013 13:58:27 +0200 [thread overview] Message-ID: <20130828135827.2307c89e@skate> (raw) In-Reply-To: <521DE2B3.9050508@gmail.com> Dear Sebastian Hesselbarth, On Wed, 28 Aug 2013 13:44:51 +0200, Sebastian Hesselbarth wrote: > > For 3.12, right? So 3.12 hasn't been released yet, so it's still time > > to fix this. > > I guess, yes. Jean-François, could you cook and submit a patch to change the compatible string? > >> Also, we'll need to distinguish between the different audio controllers > >> on a single SoC, i.e. i2s0 and i2s1. I suggest checking the (phys) reg > >> base passed. > > > > For what reason does the driver needs to know whether it's the instance > > 0 or instance 1 ? If it's needed for some specific reason, then there > > should probably be something like marvell,i2s-channel-id = <0> and > > marvell,i2s-channel-id = <1>. > > On Dove, audio1 has SPDIF out, audio0 hasn't. Russell also mentioned to > get rid of "i2s" and use "audio" instead. Most SoC's controllers are > i2s only but as soon as SPDIF comes into play, it is a different > interface protocol. > > I am fine with having a "marvell,channel-id" (no "i2s") to discriminate > the instances, although reg offset should be sufficient. Well, the reg offset is a possibility, but it's not really nice, and would have to be adapted to each and every SoC even if the reset of the audio IP is the same. Though, if the difference between the two units is the availability of SPDIF support, then we shouldn't encode the channel number, but instead the availability of SPDIF, i.e: audio0 { reg = <... ...>; compatible = "marvell,kirkwood-audio"; marvell,has-spdif; }; audio1 { reg = <... ...>; compatible = "marvell,kirkwood-audio"; }; Thomas -- Thomas Petazzoni, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com
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From: thomas.petazzoni@free-electrons.com (Thomas Petazzoni) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/2] ARM: Dove: Add the audio devices in DT Date: Wed, 28 Aug 2013 13:58:27 +0200 [thread overview] Message-ID: <20130828135827.2307c89e@skate> (raw) In-Reply-To: <521DE2B3.9050508@gmail.com> Dear Sebastian Hesselbarth, On Wed, 28 Aug 2013 13:44:51 +0200, Sebastian Hesselbarth wrote: > > For 3.12, right? So 3.12 hasn't been released yet, so it's still time > > to fix this. > > I guess, yes. Jean-Fran?ois, could you cook and submit a patch to change the compatible string? > >> Also, we'll need to distinguish between the different audio controllers > >> on a single SoC, i.e. i2s0 and i2s1. I suggest checking the (phys) reg > >> base passed. > > > > For what reason does the driver needs to know whether it's the instance > > 0 or instance 1 ? If it's needed for some specific reason, then there > > should probably be something like marvell,i2s-channel-id = <0> and > > marvell,i2s-channel-id = <1>. > > On Dove, audio1 has SPDIF out, audio0 hasn't. Russell also mentioned to > get rid of "i2s" and use "audio" instead. Most SoC's controllers are > i2s only but as soon as SPDIF comes into play, it is a different > interface protocol. > > I am fine with having a "marvell,channel-id" (no "i2s") to discriminate > the instances, although reg offset should be sufficient. Well, the reg offset is a possibility, but it's not really nice, and would have to be adapted to each and every SoC even if the reset of the audio IP is the same. Though, if the difference between the two units is the availability of SPDIF support, then we shouldn't encode the channel number, but instead the availability of SPDIF, i.e: audio0 { reg = <... ...>; compatible = "marvell,kirkwood-audio"; marvell,has-spdif; }; audio1 { reg = <... ...>; compatible = "marvell,kirkwood-audio"; }; Thomas -- Thomas Petazzoni, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com
next prev parent reply other threads:[~2013-08-28 11:58 UTC|newest] Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-08-28 9:34 [PATCH 1/2] ARM: Dove: Add the audio devices in DT Jean-Francois Moine 2013-08-28 9:34 ` Jean-Francois Moine 2013-08-28 10:13 ` Sebastian Hesselbarth 2013-08-28 10:13 ` Sebastian Hesselbarth 2013-08-28 10:13 ` Sebastian Hesselbarth 2013-08-28 10:19 ` Thomas Petazzoni 2013-08-28 10:19 ` Thomas Petazzoni 2013-08-28 10:19 ` Thomas Petazzoni 2013-08-28 10:26 ` Sebastian Hesselbarth 2013-08-28 10:26 ` Sebastian Hesselbarth 2013-08-28 10:26 ` Sebastian Hesselbarth 2013-08-28 11:15 ` Thomas Petazzoni 2013-08-28 11:15 ` Thomas Petazzoni 2013-08-28 11:44 ` Sebastian Hesselbarth 2013-08-28 11:44 ` Sebastian Hesselbarth 2013-08-28 11:58 ` Thomas Petazzoni [this message] 2013-08-28 11:58 ` Thomas Petazzoni 2013-08-28 12:13 ` Russell King - ARM Linux 2013-08-28 12:13 ` Russell King - ARM Linux 2013-08-28 12:29 ` Thomas Petazzoni 2013-08-28 12:29 ` Thomas Petazzoni 2013-08-28 12:42 ` Russell King - ARM Linux 2013-08-28 12:42 ` Russell King - ARM Linux 2013-08-28 12:51 ` Thomas Petazzoni 2013-08-28 12:51 ` Thomas Petazzoni 2013-08-28 13:58 ` Russell King - ARM Linux 2013-08-28 13:58 ` Russell King - ARM Linux 2013-08-28 12:16 ` Sebastian Hesselbarth 2013-08-28 12:16 ` Sebastian Hesselbarth 2013-08-29 10:07 ` Jean-Francois Moine 2013-08-29 10:07 ` Jean-Francois Moine 2013-08-29 10:13 ` Russell King - ARM Linux 2013-08-29 10:13 ` Russell King - ARM Linux 2013-08-29 11:01 ` Sebastian Hesselbarth 2013-08-29 11:01 ` Sebastian Hesselbarth 2013-08-30 15:08 ` Russell King - ARM Linux 2013-08-30 15:08 ` Russell King - ARM Linux 2013-08-29 9:46 ` Jean-Francois Moine 2013-08-29 9:46 ` Jean-Francois Moine 2013-08-29 16:12 ` Mark Brown 2013-08-29 16:12 ` Mark Brown 2013-08-29 16:33 ` Russell King - ARM Linux 2013-08-29 16:33 ` Russell King - ARM Linux 2013-08-29 17:12 ` Mark Brown 2013-08-29 17:12 ` Mark Brown 2013-08-29 18:02 ` Sebastian Hesselbarth 2013-08-29 18:02 ` Sebastian Hesselbarth 2013-08-29 18:20 ` Mark Brown 2013-08-29 18:20 ` Mark Brown 2013-08-29 18:34 ` Russell King - ARM Linux 2013-08-29 18:34 ` Russell King - ARM Linux 2013-08-28 19:49 ` Sergei Shtylyov 2013-08-28 19:49 ` Sergei Shtylyov 2013-08-29 9:38 ` Jean-Francois Moine 2013-08-29 9:38 ` Jean-Francois Moine 2013-08-29 14:13 ` Sergei Shtylyov 2013-08-29 14:13 ` Sergei Shtylyov
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