From: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
To: "David E. Box" <david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Cc: wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org,
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linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH V2] i2c-designware: Add Intel Baytrail PMIC I2C bus support
Date: Tue, 23 Sep 2014 21:00:57 +0200 [thread overview]
Message-ID: <20140923190057.GN15315@lukather> (raw)
In-Reply-To: <1411497626-7984-1-git-send-email-david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
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Hi David,
On Tue, Sep 23, 2014 at 11:40:26AM -0700, David E. Box wrote:
> This patch implements an I2C bus sharing mechanism between the host and platform
> hardware on select Intel BayTrail SoC platforms using the X-Powers AXP288 PMIC.
>
> On these platforms access to the PMIC must be shared with platform hardware. The
> hardware unit assumes full control of the I2C bus and the host must request
> access through a special semaphore. Hardware control of the bus also makes it
> necessary to disable runtime pm to avoid interfering with hardware transactions.
>
> Signed-off-by: David E. Box <david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Sorry for stepping in like this without really knowing your platform,
but wouldn't using the hwspinlock framework make more sense than
hardcoding your own internal functions here?
Thanks,
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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next prev parent reply other threads:[~2014-09-23 19:00 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-12 17:36 [PATCH] i2c-designware: Intel BayTrail PMIC I2C bus support David E. Box
[not found] ` <1410543367-6565-1-git-send-email-david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-09-15 6:57 ` Maxime Coquelin
[not found] ` <54168DE2.8020303-qxv4g6HH51o@public.gmane.org>
2014-09-15 16:55 ` David E. Box
2014-09-16 9:44 ` Mika Westerberg
[not found] ` <20140916094449.GZ10854-3PARRvDOhMZrdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2014-09-16 10:53 ` Jacob Pan
2014-09-16 10:58 ` Mika Westerberg
2014-09-17 4:01 ` Li, Aubrey
2014-09-17 11:02 ` One Thousand Gnomes
2014-09-23 18:40 ` [PATCH V2] i2c-designware: Add Intel Baytrail " David E. Box
[not found] ` <1411497626-7984-1-git-send-email-david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-09-23 19:00 ` Maxime Ripard [this message]
2014-09-23 19:58 ` David E. Box
2014-09-25 9:47 ` Maxime Ripard
[not found] ` <20141007191420.GA25126@pathfinder>
2014-10-09 12:36 ` Maxime Ripard
2014-11-11 11:50 ` Mika Westerberg
2014-12-02 0:09 ` [PATCH V3 0/2] i2c-designware: Baytrail bus locking driver David E. Box
2014-12-02 0:09 ` [PATCH V3 1/2] i2c-designware: Add i2c bus locking support David E. Box
2014-12-03 16:01 ` Mika Westerberg
[not found] ` <20141203160125.GB28857-3PARRvDOhMZrdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2014-12-04 18:49 ` David E. Box
[not found] ` <1417478973-25522-2-git-send-email-david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-12-04 7:59 ` Jarkko Nikula
2014-12-04 18:42 ` David E. Box
2015-01-13 9:48 ` Wolfram Sang
2015-01-14 18:15 ` David E. Box
2014-12-02 0:09 ` [PATCH V3 2/2] i2c-designware: Add Intel Baytrail PMIC I2C bus support David E. Box
2014-12-03 16:10 ` Mika Westerberg
[not found] ` <20141203161046.GC28857-3PARRvDOhMZrdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2014-12-04 19:11 ` David E. Box
[not found] ` <1417478973-25522-1-git-send-email-david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2014-12-06 3:51 ` [PATCH V3 0/2] i2c-designware: Baytrail bus locking driver Shinya Kuribayashi
2015-01-15 9:12 ` [PATCH V4 0/2] i2c-designware: Add Intel Baytrail pmic i2c bus support David E. Box
[not found] ` <1421313137-1613-1-git-send-email-david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2015-01-15 9:12 ` [PATCH V4 2/2] i2c-designware: Add Intel Baytrail PMIC I2C " David E. Box
[not found] ` <1421313137-1613-3-git-send-email-david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2015-01-22 14:28 ` Mika Westerberg
2015-01-22 20:48 ` David E. Box
2015-01-23 9:32 ` Mika Westerberg
2015-01-23 14:18 ` Wolfram Sang
2015-01-26 11:27 ` [PATCH V4 0/2] i2c-designware: Add Intel Baytrail pmic i2c " Wolfram Sang
2015-01-15 9:12 ` [PATCH V4 1/2] i2c-designware: Add i2c bus locking support David E. Box
[not found] ` <1421313137-1613-2-git-send-email-david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2015-01-22 14:22 ` Mika Westerberg
2014-11-11 11:32 ` [PATCH V2] i2c-designware: Add Intel Baytrail PMIC I2C bus support Wolfram Sang
2014-11-11 17:11 ` David E. Box
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