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From: "David E. Box" <david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org
Cc: jdelvare-l3A5Bk7waGM@public.gmane.org,
	arnd-r2nGTMty4D4@public.gmane.org,
	maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org,
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	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH V3 0/2] i2c-designware: Baytrail bus locking driver
Date: Mon,  1 Dec 2014 16:09:31 -0800	[thread overview]
Message-ID: <1417478973-25522-1-git-send-email-david.e.box@linux.intel.com> (raw)
In-Reply-To: <1411497626-7984-1-git-send-email-david.e.box-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

Select Intel Baytrail platforms support PMIC's whose i2c bus may be controlled
exclusively by platform hardware. This patch set adds support for i2c bus
locking to the designware core and provides a driver module for managing
the lock on these platforms. Since the lock on these systems isn't enumerable
outside of the i2c platform driver, the locking functions are assigned at
compile time.

V2:     Moved semaphore detection out of dw platform driver
        Replaced function pointers with defined acquire/release functions in dw
                core. This helps elliminate the ifdefery in the dw platform driver.
        Use new has_hw_lock flag to check if the lock exists on a given bus.
        Use new pm_runtime_disabled flag to conditionally turnoff runtime pm
                in the dw platform driver.

V3:	Split lock support and driver into separate patches
	Change module build to bool. Platforms running without this driver cannot
		perform critical functions such as charging. Futhermore attempts by
		other drivers to access the i2c bus without a lock will hang the
		platform.
	Replaced has_hw_lock flag with acquire/release function pointers.
	Replaced acquire/release ifdef code with single i2c_dw_eval_lock_support()
		test for cleaner (if still undesireable) compile time scalability.
		Future Intel platforms will however continue to use the Baytrail
		driver.

David E. Box (2):
  i2c-designware: Add i2c bus locking support
  i2c-designware: Add Intel Baytrail PMIC I2C bus support

 drivers/i2c/busses/Kconfig                   |  12 +++
 drivers/i2c/busses/Makefile                  |   1 +
 drivers/i2c/busses/i2c-designware-baytrail.c | 155 +++++++++++++++++++++++++++
 drivers/i2c/busses/i2c-designware-core.c     |  11 ++
 drivers/i2c/busses/i2c-designware-core.h     |  12 +++
 drivers/i2c/busses/i2c-designware-platdrv.c  |  18 +++-
 6 files changed, 204 insertions(+), 5 deletions(-)
 create mode 100644 drivers/i2c/busses/i2c-designware-baytrail.c

-- 
1.9.1

  parent reply	other threads:[~2014-12-02  0:09 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
2014-11-11 11:32     ` Wolfram Sang
2014-11-11 17:11       ` 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
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       ` David E. Box [this message]
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

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