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Mark Brown e24a04c44c regulator: Implement WM831x BuckWise DC-DC convertor DVS support 
The BuckWise DC-DC convertors in WM831x devices support switching to
a second output voltage using the logic level on one of the device
pins. This is intended to allow rapid voltage switching for uses like
cpufreq, replacing the I2C or SPI write used to configure the voltage
of the regulator with a much faster GPIO status change.

This is implemented by keeping the DVS voltage configured as the
maximum voltage permitted for the regulator. If a request is made
for the maximum voltage then the GPIO is used to switch to the DVS
voltage, otherwise the normal ON voltage is updated and used. This
follows the idiom used by most cpufreq drivers, which drop the
minimum voltage as the core frequency is dropped but use a constant
maximum - raising the voltage should normally be fast, but lowering
it may be slower.

Configuration of the DVS MFP on the device should be done externally,
for example via OTP.

Support is present in the hardware for monitoring the status of the
transition using a second GPIO. This is not currently implemented
but platform data is provided for it - the driver currently assumes
that the device will be configured to transition immediately - but
platform data is provided to reduce merge issues once it is.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2009-12-17 10:27:22 +00:00
..
accessibility
acpi Merge branch 'misc-2.6.33' into release 2009-12-16 14:22:32 -05:00
amba
ata Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2009-12-12 14:27:24 -08:00
atm drivers/atm: Correct code taking the size of a pointer 2009-12-13 19:56:33 -08:00
auxdisplay
base Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6 2009-12-16 12:36:49 -08:00
block Merge branch 'for-2.6.33' of git://git.kernel.dk/linux-2.6-block 2009-12-15 09:11:28 -08:00
bluetooth USB: remove the auto_pm flag 2009-12-11 11:55:21 -08:00
cdrom Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2009-12-09 19:03:16 -08:00
char Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-12-16 12:33:19 -08:00
clocksource cs5535: add a generic clock event MFGPT driver 2009-12-15 08:53:28 -08:00
connector
cpufreq Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-12-14 09:58:24 -08:00
cpuidle drivers/cpuidle: Move dereference after NULL test 2009-12-15 08:53:25 -08:00
crypto Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-12-14 09:58:24 -08:00
dca
dio m68k: don't export static inline functions 2009-12-06 11:18:28 +01:00
dma Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2009-12-16 10:28:56 -08:00
edac Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp 2009-12-16 10:09:43 -08:00
eisa
firewire Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2009-12-11 15:22:27 -08:00
firmware firmware: only allow EDD on x86 2009-12-15 08:53:34 -08:00
gpio gpiolib: add support for changing value polarity in sysfs 2009-12-16 07:20:01 -08:00
gpu Merge branch 'drm-vmware-staging' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2009-12-16 13:19:31 -08:00
hid USB: remove the auto_pm flag 2009-12-11 11:55:21 -08:00
hwmon lis3: scale output values to mg 2009-12-15 08:53:36 -08:00
i2c const: constify remaining dev_pm_ops 2009-12-15 08:53:25 -08:00
ide Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2009-12-12 14:27:24 -08:00
idle
ieee1394 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-12-09 19:43:33 -08:00
ieee802154
infiniband Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-12-16 12:04:02 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-12-16 10:31:44 -08:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6 2009-12-14 12:33:02 -08:00
leds tree-wide: convert open calls to remove spaces to skip_spaces() lib function 2009-12-15 08:53:32 -08:00
lguest Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-12-14 09:58:24 -08:00
macintosh Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2009-12-12 14:27:24 -08:00
mca
md Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm 2009-12-15 09:12:01 -08:00
media V4L/DVB (13698): pms: replace asm/uaccess.h to linux/uaccess.h 2009-12-16 09:28:01 -02:00
memstick
message Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-12-09 19:43:33 -08:00
mfd mfd: compile fix for twl4030 renaming 2009-12-15 09:33:36 -08:00
misc Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-12-16 12:33:19 -08:00
mmc mmc: let tmio-mmc use dev_name() with request_irq() 2009-12-15 08:53:35 -08:00
mtd Merge git://git.infradead.org/mtd-2.6 2009-12-16 10:23:43 -08:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-12-16 10:33:18 -08:00
nubus
of Merge commit 'origin/master' into next 2009-12-09 17:14:38 +11:00
oprofile Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-12-14 09:58:24 -08:00
parisc parisc: Fixup last users of irq_chip->typename 2009-12-16 03:48:56 +00:00
parport parport_pc.c: use correct length in strncmp 2009-12-16 07:20:12 -08:00
pci Merge git://git.infradead.org/iommu-2.6 2009-12-16 10:11:38 -08:00
pcmcia const: constify remaining dev_pm_ops 2009-12-15 08:53:25 -08:00
platform Merge branch 'misc-2.6.33' into release 2009-12-16 14:22:32 -05:00
pnp Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-12-16 12:33:19 -08:00
power Merge git://git.infradead.org/battery-2.6 2009-12-15 08:59:33 -08:00
pps
ps3
rapidio
regulator regulator: Implement WM831x BuckWise DC-DC convertor DVS support 2009-12-17 10:27:22 +00:00
rtc ARM: NUC900: add RTC driver support for nuc910 and nuc920 2009-12-16 07:20:00 -08:00
s390 tree-wide: convert open calls to remove spaces to skip_spaces() lib function 2009-12-15 08:53:32 -08:00
sbus
scsi Subject: Re: [PATCH] strstrip incorrectly marked __must_check 2009-12-15 08:53:34 -08:00
serial Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2009-12-16 10:29:52 -08:00
sfi
sh sh: pfc: Fixup type mismatch in debug printks. 2009-12-09 15:51:27 +09:00
sn ioc3/ioc4: fix error path on driver registration 2009-12-15 08:53:27 -08:00
spi const: constify remaining dev_pm_ops 2009-12-15 08:53:25 -08:00
ssb Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-12-05 15:22:26 -08:00
staging Merge branch 'drm-vmware-staging' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2009-12-16 13:19:31 -08:00
tc
telephony Merge branch 'for-next' into for-linus 2009-12-07 18:36:35 +01:00
thermal Merge branch 'misc-2.6.33' into release 2009-12-16 14:22:32 -05:00
uio const: constify remaining dev_pm_ops 2009-12-15 08:53:25 -08:00
usb isp1362-hcd: use bitmap_find_next_zero_area 2009-12-16 07:20:18 -08:00
uwb
video Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2009-12-16 10:29:52 -08:00
virtio
vlynq
w1
watchdog const: constify remaining dev_pm_ops 2009-12-15 08:53:25 -08:00
xen Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-12-11 12:18:16 -08:00
zorro m68k: don't export static inline functions 2009-12-06 11:18:28 +01:00
Kconfig cs5535: add a generic clock event MFGPT driver 2009-12-15 08:53:28 -08:00
Makefile