From: Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
To: Mark Brown <broonie@kernel.org>
Cc: Nishanth Menon <nm@ti.com>, Tero Kristo <t-kristo@ti.com>,
Grygorii Strashko <grygorii.strashko@ti.com>,
Mike Turquette <mturquette@linaro.org>,
linux-kernel@vger.kernel.org,
Liam Girdwood <liam.r.girdwood@linux.intel.com>,
linux-omap <linux-omap@vger.kernel.org>,
linux-arm <linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC v1] regulator: core: introduce regulator chain locking scheme
Date: Mon, 15 Apr 2013 19:21:25 +0300 [thread overview]
Message-ID: <516C2905.8000200@ti.com> (raw)
In-Reply-To: <20130415155040.GD15837@opensource.wolfsonmicro.com>
Hi Mark,
On 04/15/2013 06:50 PM, Mark Brown wrote:
>> In addition, such locking scheme allows to have access to the supplier
>> regulator API from inside child's (consumer) regulator API.
> I've still not seen any use case articulated for doing this...
Use case is introduced in ABB series:
http://www.mail-archive.com/linux-omap@vger.kernel.org/msg88293.html
During voltage scaling we would like to have the following sequence:
cpufreq_cpu0
|
|---> set_voltage(ABB)
|
|->set_voltage(AVS)
|
|-->set_voltage(smps123)
Where smps123 is a regulator, connected ot i2c bus. In this particular
case "regulator chain" guarantees proper order of calls of voltage
scaling sequence.
Regards,
Andrii
next prev parent reply other threads:[~2013-04-15 16:21 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-15 13:03 [RFC v1 0/1] introduce regulator chain locking scheme Grygorii Strashko
2013-04-15 13:03 ` [RFC v1] regulator: core: " Grygorii Strashko
2013-04-15 15:50 ` Mark Brown
2013-04-15 16:21 ` Andrii Tseglytskyi [this message]
2013-04-15 16:40 ` Mark Brown
2013-04-18 16:29 ` Grygorii Strashko
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