From: Jonathan Cameron <jic23@cam.ac.uk>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Zoltan Devai <zdevai@gmail.com>,
Linus Walleij <linus.walleij@linaro.org>,
linux-arm-kernel@lists.infradead.org, linux-iio@vger.kernel.org
Subject: Re: [PATCH 4/9] ARM: SPMP8000: Add ADC driver
Date: Wed, 12 Oct 2011 16:41:31 +0100 [thread overview]
Message-ID: <4E95B52B.1080409@cam.ac.uk> (raw)
In-Reply-To: <20111012144251.GM3647@opensource.wolfsonmicro.com>
On 10/12/11 15:42, Mark Brown wrote:
> On Tue, Oct 11, 2011 at 05:24:47PM +0200, Arnd Bergmann wrote:
>> On Tuesday 11 October 2011, Mark Brown wrote:
>
>>> I'm not sure that IIO isn't the kernel subsystem we're looking for here
>>> - as I keep saying when this comes up it's just representing bare DACs
>>> and ADCs pretty directly which looks like a generic subsystem to me.
>
>> Possible, yes. Until now, IIO is a subsystem for user-level access
>> not for kernel access though, so it's not the right place yet.
>> If we decide to let IIO handle all ADC input, do you think it would
>> also be the right place to do PWM output, rather than having a
>> separate subsystem for that?
>
> Off the top of my head I'd expect PWM to be a separate thing which could
> optionally synthesize stuff onto an IIO device (bitbanging the PWM
> essentially). The specialized PWM stuff tends to be "output this steady
> state for an indefinite period" type interface rather than "here's a
> batch of samples, output them".
Same can be true of dds chips, with the addition that they often have
gpio type switching between a set of predefined frequencies (FM basically).
+ weird waveform choices sometimes.
WARNING: multiple messages have this Message-ID (diff)
From: jic23@cam.ac.uk (Jonathan Cameron)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 4/9] ARM: SPMP8000: Add ADC driver
Date: Wed, 12 Oct 2011 16:41:31 +0100 [thread overview]
Message-ID: <4E95B52B.1080409@cam.ac.uk> (raw)
In-Reply-To: <20111012144251.GM3647@opensource.wolfsonmicro.com>
On 10/12/11 15:42, Mark Brown wrote:
> On Tue, Oct 11, 2011 at 05:24:47PM +0200, Arnd Bergmann wrote:
>> On Tuesday 11 October 2011, Mark Brown wrote:
>
>>> I'm not sure that IIO isn't the kernel subsystem we're looking for here
>>> - as I keep saying when this comes up it's just representing bare DACs
>>> and ADCs pretty directly which looks like a generic subsystem to me.
>
>> Possible, yes. Until now, IIO is a subsystem for user-level access
>> not for kernel access though, so it's not the right place yet.
>> If we decide to let IIO handle all ADC input, do you think it would
>> also be the right place to do PWM output, rather than having a
>> separate subsystem for that?
>
> Off the top of my head I'd expect PWM to be a separate thing which could
> optionally synthesize stuff onto an IIO device (bitbanging the PWM
> essentially). The specialized PWM stuff tends to be "output this steady
> state for an indefinite period" type interface rather than "here's a
> batch of samples, output them".
Same can be true of dds chips, with the addition that they often have
gpio type switching between a set of predefined frequencies (FM basically).
+ weird waveform choices sometimes.
next prev parent reply other threads:[~2011-10-12 15:41 UTC|newest]
Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-09 16:36 Add support for the SPMP8000 SoC and Letcool board Zoltan Devai
2011-10-09 16:36 ` [PATCH 1/9] ARM: vic: Don't write to the read-only register VIC_IRQ_STATUS Zoltan Devai
2011-10-10 1:35 ` Linus Walleij
2011-10-10 13:59 ` Zoltan Devai
2011-10-09 16:36 ` [PATCH 2/9] ARM: SPMP8000: Add machine base files Zoltan Devai
2011-10-09 17:22 ` Jamie Iles
2011-10-10 11:36 ` Zoltan Devai
2011-10-10 11:52 ` Jamie Iles
2011-10-11 14:44 ` Arnd Bergmann
2011-10-16 14:10 ` Zoltan Devai
2011-10-16 15:57 ` Russell King - ARM Linux
2011-10-16 20:59 ` Arnd Bergmann
2011-10-16 20:52 ` Jean-Christophe PLAGNIOL-VILLARD
2011-10-17 11:44 ` Arnd Bergmann
2011-10-17 11:44 ` Arnd Bergmann
2011-10-09 16:36 ` [PATCH 3/9] ARM: SPMP8000: Add clk support Zoltan Devai
2011-10-13 9:38 ` Russell King - ARM Linux
2011-10-16 14:16 ` Zoltan Devai
2011-10-17 12:15 ` Mark Brown
2011-10-18 10:18 ` Russell King - ARM Linux
2011-10-09 16:36 ` [PATCH 4/9] ARM: SPMP8000: Add ADC driver Zoltan Devai
2011-10-10 1:29 ` Linus Walleij
2011-10-10 1:29 ` Linus Walleij
2011-10-10 9:42 ` Jonathan Cameron
2011-10-10 9:42 ` Jonathan Cameron
2011-10-10 9:46 ` Jonathan Cameron
2011-10-10 9:46 ` Jonathan Cameron
2011-10-10 10:00 ` Mark Brown
2011-10-10 10:00 ` Mark Brown
2011-10-10 11:42 ` Zoltan Devai
2011-10-10 11:42 ` Zoltan Devai
2011-10-10 11:44 ` Mark Brown
2011-10-10 11:44 ` Mark Brown
2011-10-11 14:17 ` Arnd Bergmann
2011-10-11 14:17 ` Arnd Bergmann
2011-10-11 14:40 ` Mark Brown
2011-10-11 14:40 ` Mark Brown
2011-10-11 15:24 ` Arnd Bergmann
2011-10-11 15:24 ` Arnd Bergmann
2011-10-11 15:39 ` Jonathan Cameron
2011-10-11 15:39 ` Jonathan Cameron
2011-10-12 14:42 ` Mark Brown
2011-10-12 14:42 ` Mark Brown
2011-10-12 15:41 ` Jonathan Cameron [this message]
2011-10-12 15:41 ` Jonathan Cameron
2011-10-13 9:47 ` Russell King - ARM Linux
2011-10-13 9:47 ` Russell King - ARM Linux
2011-10-13 11:09 ` Linus Walleij
2011-10-13 11:09 ` Linus Walleij
2011-10-13 11:35 ` Jonathan Cameron
2011-10-13 11:35 ` Jonathan Cameron
2011-10-13 11:35 ` Mark Brown
2011-10-13 11:35 ` Mark Brown
2011-10-13 12:17 ` Russell King - ARM Linux
2011-10-13 12:17 ` Russell King - ARM Linux
2011-10-13 14:19 ` Arnd Bergmann
2011-10-13 14:19 ` Arnd Bergmann
2011-10-13 14:27 ` Mark Brown
2011-10-13 14:27 ` Mark Brown
2011-10-13 14:38 ` Mark Brown
2011-10-13 14:38 ` Mark Brown
2011-10-13 14:56 ` Arnd Bergmann
2011-10-13 14:56 ` Arnd Bergmann
2011-10-13 16:25 ` Mark Brown
2011-10-13 16:25 ` Mark Brown
2011-10-09 16:36 ` [PATCH 5/9] ARM: SPMP8000: Add pinmux driver Zoltan Devai
2011-10-10 1:32 ` Linus Walleij
2011-10-10 8:01 ` Barry Song
2011-10-10 8:34 ` Linus Walleij
2011-10-09 16:36 ` [PATCH 6/9] ARM: SPMP8000: Add pwm driver Zoltan Devai
2011-10-10 1:50 ` Linus Walleij
2011-10-10 9:30 ` Sascha Hauer
2011-10-09 16:36 ` [PATCH 7/9] ARM: SPMP8000: Add dts file of SPMP8000 SoC and Letcool board Zoltan Devai
2011-10-10 8:54 ` Jamie Iles
2011-10-09 16:36 ` [PATCH 8/9] ARM: SPMP8000: Add support for the " Zoltan Devai
2011-10-11 14:09 ` Arnd Bergmann
2011-10-11 14:43 ` Zoltan Devai
2011-10-11 15:18 ` Arnd Bergmann
2011-10-13 9:54 ` Russell King - ARM Linux
2011-10-09 16:36 ` [PATCH 9/9] ARM: SPMP8000: Add Kconfig and Makefile entries to build the machine Zoltan Devai
2011-10-09 17:25 ` Jamie Iles
2011-10-10 1:43 ` Linus Walleij
2011-10-13 9:53 ` Russell King - ARM Linux
2011-10-10 8:55 ` Add support for the SPMP8000 SoC and Letcool board Jamie Iles
2011-10-10 12:00 ` Zoltan Devai
2011-10-10 12:03 ` Jamie Iles
2011-10-11 14:57 ` Arnd Bergmann
[not found] ` <1319040118-29773-1-git-send-email-zoss@devai.org>
2011-10-19 16:01 ` [PATCH v2 1/5] ARM: SPMP8000: Add machine base files Zoltan Devai
2011-10-19 19:15 ` Arnd Bergmann
2011-10-21 22:54 ` Russell King - ARM Linux
2011-10-23 21:47 ` Zoltan Devai
2011-10-23 21:37 ` Zoltan Devai
2011-10-24 9:13 ` Arnd Bergmann
2011-10-24 11:00 ` Jamie Iles
2011-11-02 13:29 ` Zoltan Devai
2011-11-03 15:08 ` Arnd Bergmann
2011-10-19 16:01 ` [PATCH v2 2/5] ARM: SPMP8000: Add clk support Zoltan Devai
2011-10-19 16:01 ` [PATCH v2 3/5] ARM: SPMP8000: Add clocksource and clockevent drivers Zoltan Devai
2011-10-19 16:01 ` [PATCH v2 4/5] ARM: SPMP8000: Add SPMP8000 SoC and Letcool board dts descriptions Zoltan Devai
2011-10-19 16:01 ` Zoltan Devai
2011-10-24 12:47 ` Rob Herring
2011-10-24 12:47 ` Rob Herring
2011-10-19 16:01 ` [PATCH v2 5/5] ARM: SPMP8000: Add Kconfig and Makefile entries Zoltan Devai
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