09 Jun, 2017
1 commit
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Add TPM PWM driver support i.MX7ULP.
Signed-off-by: Bai Ping
[Octavian: updated for 4.9 APIs]
Signed-off-by: Octavian Purdila
08 Sep, 2016
1 commit
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Add support for the PWM controller found in the Amlogic SoCs. This
driver supports the Meson8b and GXBB SoCs.Signed-off-by: Neil Armstrong
Tested-by: Martin Blumenstingl
Tested-by: Jerome Brunet
Signed-off-by: Thierry Reding
25 Jul, 2016
1 commit
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Use the new ChromeOS EC EC_CMD_PWM_{GET,SET}_DUTY commands to control
one or more PWMs attached to the Embedded Controller. Because the EC
allows us to modify the duty cycle (as a percentage, where U16_MAX is
100%) but not the period, we assign the period a fixed value of
EC_PWM_MAX_DUTY and reject all attempts to change it.This driver supports only device tree at the moment, because that
provides a very flexible way of describing the relationship between PWMs
and their consumer devices (e.g., backlight). On a non-DT system, we'll
probably want to use the non-GENERIC addressing (i.e., we'll need to
make special device instances that will use EC_PWM_TYPE_KB_LIGHT or
EC_PWM_TYPE_DISPLAY_LIGHT), as well as the relatively inflexible
pwm_lookup infrastructure for matching devices. Defer that work for now.Signed-off-by: Brian Norris
Signed-off-by: Thierry Reding
11 Jul, 2016
2 commits
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This adds a driver for the PWM block found in chips of the STMPE 24xx
series of multi-purpose I2C expanders. (I think STMPE means ST
Microelectronics Multi-Purpose Expander.) This PWM was designed in
accordance with Nokia specifications and is kind of weird and usually
just switched between max and zero duty cycle. However it is indeed a
PWM so it needs to live in the PWM subsystem.This PWM is mostly used for white LED backlight.
Cc: Lee Jones
Signed-off-by: Linus Walleij
Signed-off-by: Thierry Reding -
Add support for the PWM controller present in Broadcom's iProc family of
SoCs. It has been tested on the Northstar+ bcm958625HR board.Signed-off-by: Yendapally Reddy Dhananjaya Reddy
[thierry.reding@gmail.com: bunch of coding style fixes, cleanups]
Signed-off-by: Thierry Reding
17 Dec, 2015
1 commit
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Adds support for using a OMAP dual-mode timer with PWM capability
as a Linux PWM device. The driver controls the timer by using the
dmtimer API.Add a platform_data structure for each pwm-omap-dmtimer nodes containing
the dmtimers functions in order to get driver not rely on platform
specific functions.Cc: Grant Erickson
Cc: NeilBrown
Cc: Joachim Eastwood
Suggested-by: Tony Lindgren
Signed-off-by: Neil Armstrong
Acked-by: Tony Lindgren
[thierry.reding@gmail.com: coding style bikeshed, fix timer leak]
Signed-off-by: Thierry Reding
06 Oct, 2015
4 commits
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Add display PWM driver support to modify backlight for MT8173 and
MT6595. The PWM has one channel to control the brightness of the
display. When the (high_width / period) is closer to 1, the screen
is brighter; otherwise, it is darker.Signed-off-by: YH Huang
Signed-off-by: Thierry Reding -
Add support for the BCM7038-style PWM controller found in all BCM7xxx STB SoCs.
This controller has a hardcoded 2 channels per controller, and cascades a
variable frequency generator on top of a fixed frequency generator which offers
a range of a 148ns period all the way to ~622ms periods.Signed-off-by: Florian Fainelli
Signed-off-by: Thierry Reding -
This patch adds support for R-Car SoCs PWM Timer. The PWM timer of
R-Car H2 has 7 channels. So, we can use the channels if we describe
device tree nodes.Signed-off-by: Yoshihiro Shimoda
Reviewed-by: Simon Horman
Signed-off-by: Thierry Reding -
Add a PWM controller driver for the Marvell Berlin SoCs. This PWM
controller has 4 channels.Signed-off-by: Antoine Tenart
Acked-by: Sebastian Hesselbarth
Signed-off-by: Thierry Reding
10 Sep, 2015
1 commit
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…erry.reding/linux-pwm
Pull pwm updates from Thierry Reding:
"This set of changes introduces the beginnings of a new API that's
based around the concept of states that can be atomically applied.
Drivers go to various lengths to implement something similar, which
indicates that the core should really be providing the necessary
framework.On top of that, there is a bit of cleanup as well as improved
kerneldoc and integration into the device-drivers DocBook.Regarding drivers there is a new one for the NXP LPC18xx family of
SoCs and a couple of fixes for existing drivers (pca9685, Broadcom
Kona and Atmel HLCDC)"* tag 'pwm/for-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
ARM: at91: pwm: atmel-hlcdc: Add at91sam9n12 errata
pwm: Add NXP LPC18xx PWM/SCT DT binding documentation
pwm: NXP LPC18xx PWM/SCT driver
pwm-pca9685: Support changing the output frequency
pwm-pca9685: Fix several driver bugs
pwm: kona: Modify settings application sequence
pwm: pca9685: Drop owner assignment
pwm: Add to device-drivers documentation
pwm: Clean up kerneldoc
pwm: Remove useless whitespace
pwm: sysfs: Remove unnecessary padding
pwm: sysfs: Properly convert from enum to string
pwm: Make use of pwm_get_xxx() helpers where appropriate
pwm: Add pwm_get_polarity() helper function
pwm: Constify PWM device where possible
pwm: Add the pwm_is_enabled() helper
09 Sep, 2015
1 commit
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This commit adds support for NXP LPC18xx PWM/SCT.
NXP LPC SoCs family, which includes LPC18xx/LPC43xx, provides a State
Configurable Timer (SCT) which can be configured as a Pulse Width
Modulator. Other SoCs in that family may share the same hardware.The PWM supports a total of 16 channels, but only 15 can be simultaneously
requested. There's only one period, global to all the channels, thus PWM
driver will refuse setting different values to it, unless there's only one
channel requested.Signed-off-by: Ariel D'Alessandro
[thierry.reding@gmail.com: remove excessive padding of fields]
Signed-off-by: Thierry Reding
21 Jul, 2015
1 commit
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The Crystalcove PMIC provides three PWM signals and this driver exports
one of them on the BYT platform which is used to control backlight for
DSI panel. This is platform device implementation of the drivers/mfd
cell device for CRC PMIC.CC: Samuel Ortiz
Cc: Linus Walleij
Cc: Alexandre Courbot
Cc: Thierry Reding
Cc: Paul Bolle
Cc: Paul Gortmaker
Tested-by: Ville Syrjälä
Signed-off-by: Shobhit Kumar
Reviewed-by: Varka Bhadram
Signed-off-by: Daniel Vetter
30 Jan, 2015
2 commits
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The Pistachio SOC from Imagination Technologies includes a Pulse Width
Modulation DAC which produces 1 to 4 digital bit-outputs which represent
digital waveforms. These PWM outputs are primarily in charge of controlling
backlight LED devices.Reviewed-by: Andrew Bresticker
Signed-off-by: Naidu Tellapati
Signed-off-by: Sai Masarapu
Signed-off-by: Ezequiel Garcia
Reviewed-by: Vladimir Zapolskiy
[thierry.reding: fixup license header as discussed on list]
Signed-off-by: Thierry Reding -
This adds a generic PWM framework driver for the PWM controller
found on Allwinner SoCs.Signed-off-by: Alexandre Belloni
Acked-by: Maxime Ripard
Signed-off-by: Thierry Reding
17 Nov, 2014
2 commits
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The HLCDC IP available in some Atmel SoCs (i.e. at91sam9x5, at91sam9n12
or sama5d3 families for instance) provides a PWM device.This driver add support for a PWM chip exposing a single PWM device (which
will most likely be used to drive a backlight device).Signed-off-by: Boris Brezillon
Tested-by: Anthony Harivel
Tested-by: Ludovic Desroches
Acked-by: Thierry Reding
Acked-by: Nicolas Ferre
Signed-off-by: Thierry Reding -
Add PWM driver for Broadcom BCM2835 processor (Raspberry Pi)
Signed-off-by: Bart Tanghe
Acked-by: Stephen Warren
Signed-off-by: Thierry Reding
23 Aug, 2014
1 commit
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The driver consists of core, PCI, and platform parts. It would be better
to split them into separate files.The platform driver is now called pwm-lpss-platform. Thus, previously
set CONFIG_PWM_LPSS=m is not enough to build it. But we are on the safe
side since it seems no one from outside Intel is using it for now.While here, move to use macros module_pci_driver() and
module_platform_driver().Signed-off-by: Andy Shevchenko
Reviewed-by: Mika Westerberg
Acked-by: Alan Cox
[thierry.reding: change select to depends on PWM_LPSS, cleanup]
Signed-off-by: Thierry Reding
07 Aug, 2014
1 commit
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This driver supports all current STi platforms' PWM IPs.
Signed-off-by: Ajit Pal Singh
Signed-off-by: Lee Jones
[thierry.reding: rename module to pwm-sti, fix build breakage]
Signed-off-by: Thierry Reding
11 Jul, 2014
1 commit
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This commit adds a driver for the PWM controller found on Rockchip
RK29, RK30 and RK31 SoCs.Signed-off-by: Beniamino Galvani
Signed-off-by: Thierry Reding
28 Apr, 2014
1 commit
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Add support for the six-channel Kona PWM controller found on Broadcom
mobile SoCs like bcm281xx.Signed-off-by: Tim Kryger
Reviewed-by: Alex Elder
Reviewed-by: Markus Mayer
Signed-off-by: Thierry Reding
01 Apr, 2014
1 commit
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Add support for Intel Low Power I/O subsystem PWM controllers found on
Intel BayTrail SoC.Signed-off-by: Mika Westerberg
Signed-off-by: Chew, Kean Ho
Signed-off-by: Chang, Rebecca Swee Fun
Signed-off-by: Chew, Chiau Ee
Signed-off-by: Thierry Reding
19 Mar, 2014
2 commits
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Add a new driver for the ARM CLPS711X Pulse Width Modulator (PWM) interface.
This CPU contain two 4-bit PWM outputs with constant period, based on CPU
PLL frequency. PWM polarity is determined by hardware by power on reset.Signed-off-by: Alexander Shiyan
Signed-off-by: Thierry Reding -
The FTM PWM device can be found on Vybrid VF610 Tower and
Layerscape LS-1 SoCs.Signed-off-by: Xiubo Li
Signed-off-by: Alison Wang
Signed-off-by: Jingchang Lu
Reviewed-by: Sascha Hauer
Reviewed-by: Yuan Yao
Signed-off-by: Thierry Reding
28 Jan, 2014
1 commit
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…ierry.reding/linux-pwm
Pull pwm changes from Thierry Reding:
"The patches for this release cycle include various enhancements
(device tree support, better compile coverage, ...) for existing
drivers. There is a new driver for Atmel SoCs.Various drivers as well as the sysfs support received minor fixes and
cleanups"* tag 'pwm/for-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
pwm: tiecap: Remove duplicate put_sync call
pwm: tiehrpwm: use dev_err() instead of pr_err()
pwm: pxa: remove unnecessary space before tabs
pwm: ep93xx: split module author names
pwm: use seq_puts() instead of seq_printf()
pwm: atmel-pwm: Do not unprepare clock after successful registration
of: Add Atmel PWM controller device tree binding
pwm: atmel-pwm: Add Atmel PWM controller driver
backlight: pwm_bl: Remove error message upon devm_kzalloc() failure
pwm: pca9685: depends on I2C rather than REGMAP_I2C
pwm: renesas-tpu: Enable driver compilation with COMPILE_TEST
pwm: jz4740: Use devm_clk_get()
pwm: jz4740: Pass device to clk_get()
pwm: sysfs: Convert to use ATTRIBUTE_GROUPS macro
pwm: pxa: Add device tree support
21 Jan, 2014
1 commit
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This is the other of the LP3943 MFD driver.
LP3943 can be used as a PWM generator, up to 2 channels.* Two PWM generators supported
* Supported PWM operations
request, free, config, enable and disable* Pin assignment
A driver data, 'pin_used' is checked when a PWM is requested.
If the output pin is already assigned, then returns as failure.
If the pin is available, 'pin_used' is set.
When the PWM is not used anymore, then it is cleared.
It is defined as unsigned long type for atomic bit operation APIs,
but only LSB 16bits are used because LP3943 has 16 outputs.Signed-off-by: Milo Kim
Acked-by: Thierry Reding
Signed-off-by: Lee Jones
17 Dec, 2013
1 commit
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Add a PWM framework driver for the PWM controller found on Atmel SoCs.
Signed-off-by: Bo Shen
Acked-by: Alexandre Belloni
Acked-by: Jean-Christophe PLAGNIOL-VILLARD
[thierry.reding: coding style and other minor cleanups]
Signed-off-by: Thierry Reding
17 Oct, 2013
1 commit
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Remove the non-standard EP93xx PWM driver in drivers/misc and add
a new driver for the PWM controllers on the EP93xx platform based
on the PWM framework.These PWM controllers each support 1 PWM channel with programmable
duty cycle, frequency, and polarity inversion.Signed-off-by: H Hartley Sweeten
Cc: Ryan Mallon
Acked-by: Arnd Bergmann
Acked-by: Greg Kroah-Hartman
Signed-off-by: Thierry Reding
21 Jun, 2013
2 commits
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The Timer Pulse Unit (TPU) is a 4-channels 16-bit timer used to generate
waveforms. This driver exposes PWM functions through the PWM API for
other drivers to use.The code is loosely based on the leds-renesas-tpu driver by Magnus Damm
and the TPU PWM driver shipped in the Armadillo EVA 800 kernel sources.Signed-off-by: Laurent Pinchart
Signed-off-by: Axel Lin
Tested-by: Simon Horman
Signed-off-by: Thierry Reding -
Add a simple sysfs interface to the generic PWM framework.
/sys/class/pwm/
`-- pwmchipN/ for each PWM chip
|-- export (w/o) ask the kernel to export a PWM channel
|-- npwm (r/o) number of PWM channels in this PWM chip
|-- pwmX/ for each exported PWM channel
| |-- duty_cycle (r/w) duty cycle (in nanoseconds)
| |-- enable (r/w) enable/disable PWM
| |-- period (r/w) period (in nanoseconds)
| `-- polarity (r/w) polarity of PWM (normal/inversed)
`-- unexport (w/o) return a PWM channel to the kernelBased on work by Lars Poeschel.
Signed-off-by: H Hartley Sweeten
Cc: Thierry Reding
Cc: Lars Poeschel
Cc: Ryan Mallon
Cc: Rob Landley
Signed-off-by: Thierry Reding
12 Jun, 2013
1 commit
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Add pwm driver for the NXP pca9685 16 channel pwm-led controller.
The driver is really barebones at this stage. E.g. the OE' pin and
therefore the corresponding registers are not supported.
The driver was tested on a HW where this pin is tied to GND.Signed-off-by: Steffen Trumtrar
[thierry.reding@gmail.com: style and whitespace cleanups]
Signed-off-by: Thierry Reding
08 Jan, 2013
1 commit
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This patch adds a PWM driver based on Atmel Timer Counter Block. The
Timer Counter Block is used in Waveform generator mode.A Timer Counter Block provides up to 6 PWM devices grouped by 2:
* group 0 = PWM 0 and 1
* group 1 = PWM 2 and 3
* group 2 = PMW 4 and 5PWM devices in a given group must be configured with the same period
value. If a PWM device in a group tries to change the period value and
the other device is already configured with a different value an error
will be returned.This driver requires device tree support. The Timer Counter Block number
used to create a PWM chip is given by the tc-block field in an
"atmel,tcb-pwm" compatible node.This patch was tested on kizbox board (at91sam9g20 SoC) with pwm-leds.
Signed-off-by: Boris BREZILLON
Signed-off-by: Thierry Reding
28 Nov, 2012
4 commits
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This driver only supported the Charging indicator LED.
New set of drivers going to provide support for both PWMs and LEDs for twl4030
and twl6030 series of PMICs.Signed-off-by: Peter Ujfalusi
Signed-off-by: Thierry Reding -
The driver supports the following LED outputs as generic PWM driver:
TWL4030 LEDA and LEDB (PWMA and PWMB)
TWL6030 Charging indicator LED (PWM LED)On TWL6030 when the PWM requested LED is configured to be controlled by SW.
In this case the user can enable/disable and set the duty period freely.
When the PWM has been freed, the LED driver is put back to HW control.Signed-off-by: Peter Ujfalusi
Signed-off-by: Thierry Reding -
The driver supports the following PWM outputs:
TWL4030 PWM0 and PWM1
TWL6030 PWM1 and PWM2On TWL4030 the PWM signals are muxed. Upon requesting the PWM the driver
will select the correct mux so the PWM can be used. When the PWM has been
freed the original configuration is going to be restored.Signed-off-by: Peter Ujfalusi
Signed-off-by: Thierry Reding -
In some platforms (like am33xx), PWM sub modules (ECAP, EHRPWM, EQEP)
are integrated to PWM subsystem. These PWM submodules has resources
shared and only one register bit-field is provided to control
module/clock enable/disable, makes it difficult to handle common
resources from independent PWMSS submodule drivers.So the solution here implemented in this patch is, to create driver for
PWMSS and take the role of parent driver for PWM submodules. PWMSS
parent driver enumerates all the child nodes under PWMSS module. Also
symbol "pwmss_submodule_state_change" exported to enable clock gating
for individual PWMSS submodules, and submodule drivers has to enable
clock gating from their drivers.As this is only supported during DT boot, the parent/child relationship
is created and populated in DT execution flow. The only required change
is inside DTS file, making EHRPWM & ECAP as a child to PWMSS node.Signed-off-by: Philip, Avinash
Signed-off-by: Thierry Reding
23 Nov, 2012
1 commit
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Add support for PWM chips present on SPEAr platforms. These PWM
chips support 4 channel output with programmable duty cycle and
frequency.More details on these PWM chips can be obtained from relevant
chapter of reference manual, present at following[1] location.1. http://www.st.com/internet/mcu/product/251211.jsp
Cc: Thierry Reding
Signed-off-by: Shiraz Hashim
Signed-off-by: Viresh Kumar
Reviewed-by: Vipin Kumar
Acked-by: Viresh Kumar
Signed-off-by: Thierry Reding
10 Oct, 2012
1 commit
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Pull pwm changes from Thierry Reding:
"All legacy PWM providers have now been moved to the PWM subsystem.
The plan for 3.8 is to adapt all board files to provide a lookup table
for PWM devices in order to get rid of the global namespace.
Subsequently, users of the legacy pwm_request() and pwm_free()
functions can be migrated to the new pwm_get() and pwm_put()
functions. Once this has been completed, the legacy API and the
compatibility code in the core can be removed.In addition to the above, these changes also add support for
configuring the polarity of a PWM signal (currently only supported on
ECAP and EHRPWM) and include a much needed rework of the i.MX driver.
Managed functions to obtain and release a PWM device (devm_pwm_get()
and devm_pwm_put()) have been added and the pwm-backlight driver has
been updated to use them. If the PWM subsystem hasn't been enabled,
dummy functions are provided that allow the subsystem to safely
compile out.Some common checks on input parameters have been moved to the core and
removed from the drivers. Finally, a small fix corrects the
description of the PWM specifier's second cell in the device tree
representation."* tag 'for-3.7-rc1' of git://gitorious.org/linux-pwm/linux-pwm: (23 commits)
pwm: dt: Fix description of second PWM cell
pwm: Check for negative duty-cycle and period
pwm: Add Ingenic JZ4740 support
MIPS: JZ4740: Export timer API
pwm: Move PUV3 PWM driver to PWM framework
unicore32: pwm: Use managed resource allocations
unicore32: pwm: Remove unnecessary indirection
unicore32: pwm: Use module_platform_driver()
unicore32: pwm: Properly remap memory-mapped registers
pwm-backlight: Use devm_pwm_get() instead of pwm_get()
pwm: Move AB8500 PWM driver to PWM framework
pwm: Fix compilation error when CONFIG_PWM is not defined
pwm: i.MX: fix clock lookup
pwm: i.MX: use per clock unconditionally
pwm: i.MX: add devicetree support
pwm: i.MX: Use module_platform_driver
pwm: i.MX: add functions to enable/disable pwm.
pwm: i.MX: remove unnecessary if in pwm_[en|dis]able
pwm: i.MX: factor out SoC specific functions
pwm: pwm-tiehrpwm: Add support for configuring polarity of PWM
...
06 Oct, 2012
2 commits
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This commit moves the driver to drivers/pwm and converts it to the new
PWM framework.Signed-off-by: Thierry Reding
Acked-by: Lars-Peter Clausen
Tested-by: Lars-Peter Clausen
Acked-by: Ralf Baechle -
This commit moves the driver to drivers/pwm and converts it to the new
PWM framework.Signed-off-by: Thierry Reding
Tested-by: Qin Rui
Acked-by: Guan Xuetao
