Commit Graph

84 Commits

Author SHA1 Message Date
Linus Torvalds
66c9457df3 pwm: Changes for v4.14-rc1
The changes for this release include a new driver for the PWM controller
 found on SoCs of the ZTX ZX family. Support for an old SH-Mobile SoC has
 been dropped and the Rockchip and MediaTek drivers gain support for more
 generations.
 
 Other than that there are a bunch of coding style fixes, minor bug fixes
 and cleanup as well as documentation patches.
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Merge tag 'pwm/for-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm updates from Thierry Reding:
 "The changes for this release include a new driver for the PWM
  controller found on SoCs of the ZTX ZX family. Support for an old
  SH-Mobile SoC has been dropped and the Rockchip and MediaTek drivers
  gain support for more generations.

  Other than that there are a bunch of coding style fixes, minor bug
  fixes and cleanup as well as documentation patches"

* tag 'pwm/for-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: (32 commits)
  pwm: pwm-samsung: fix suspend/resume support
  pwm: samsung: Remove redundant checks from pwm_samsung_config()
  pwm: mediatek: Disable clock on PWM configuration failure
  dt-bindings: pwm: Add MT2712/MT7622 information
  pwm: mediatek: Fix clock control issue
  pwm: mediatek: Fix PWM source clock selection
  pwm: mediatek: Fix Kconfig description
  pwm: tegra: Explicitly request exclusive reset control
  pwm: hibvt: Explicitly request exclusive reset control
  pwm: tiehrpwm: Set driver data before runtime PM enable
  pwm: tiehrpwm: Miscellaneous coding style fixups
  pwm: tiecap: Set driver data before runtime PM enable
  pwm: tiecap: Miscellaneous coding style fixups
  dt-bindings: pwm: tiecap: Add TI 66AK2G SoC specific compatible
  pwm: tiehrpwm: fix clock imbalance in probe error path
  pwm: tiehrpwm: Fix runtime PM imbalance at unbind
  pwm: Kconfig: Enable pwm-tiecap to be built for Keystone
  pwm: Add ZTE ZX PWM device driver
  dt-bindings: pwm: Add bindings doc for ZTE ZX PWM controller
  pwm: bcm2835: Support for polarity setting via DT
  ...
2017-09-11 13:04:32 -07:00
Fabrice Gasnier
e70a540b4e pwm: Add STM32 LPTimer PWM driver
Add support for single PWM channel on Low-Power Timer, that can be
found on some STM32 platforms.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2017-09-04 14:49:09 +01:00
Zhi Mao
aa12d7a7a9 pwm: mediatek: Fix Kconfig description
Fix a copy/paste error that sneaked into the Kconfig description of the
Mediatek PWM driver.

Signed-off-by: Zhi Mao <zhi.mao@mediatek.com>
Acked-by: John Crispin <john@phrozen.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2017-08-21 10:39:08 +02:00
Vignesh R
cd9b53daaf pwm: Kconfig: Enable pwm-tiecap to be built for Keystone
66AK2G SoC has ECAP subsystem that is used as pwm-backlight provider for
display. Hence, enable pwm-tiecap driver to be built for Keystone
architecture.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2017-08-21 08:11:24 +02:00
Shawn Guo
4836193c43 pwm: Add ZTE ZX PWM device driver
It adds PWM device driver for ZTE ZX family SoCs. The PWM controller
supports 4 devices with polarity configuration.

The driver has been tested with pwm-regulator support to scale core
voltage via cpufreq.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2017-08-21 08:11:24 +02:00
John Crispin
caf065f8fd pwm: Add MediaTek PWM support
This patch adds support for the PWM core found on current ARM base SoCs
made by MediaTek. This IP core supports 5 channels and has 2 operational
modes. There is the old mode, which is a classical PWM and the new mode
which allows the user to define bitmasks that get clocked out on the
pins. As the subsystem currently only supports PWM cores with the "old"
mode, we can safely ignore the "new" mode for now.

Signed-off-by: John Crispin <john@phrozen.org>
[thierry.reding@gmail.com: minor cleanups]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2017-04-06 17:45:04 +02:00
Linus Torvalds
545b2820c4 pwm: Changes for v4.11-rc1
This set contains mostly fixes to existing drivers as well as cleanup of
 code that's not been in active use for a while.
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Merge tag 'pwm/for-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm updates from Thierry Reding:
 "This set contains mostly fixes to existing drivers as well as cleanup
  of code that's not been in active use for a while"

* tag 'pwm/for-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: (27 commits)
  acpi: lpss: call pwm_add_table() for BSW PWM device
  pwm: Try to load modules during pwm_get()
  pwm: Don't hold pwm_lookup_lock longer than necessary
  pwm: Make the PWM_POLARITY flag in DTB optional
  pwm: Print error messages with pr_err() instead of pr_debug()
  pwm: imx: Add polarity inversion support to i.MX's PWMv2
  pwm: imx: doc: Update imx-pwm.txt documentation entry
  pwm: imx: Remove redundant i.MX PWMv2 code
  pwm: imx: Provide atomic PWM support for i.MX PWMv2
  pwm: imx: Move PWMv2 wait for fifo slot code to a separate function
  pwm: imx: Move PWMv2 software reset code to a separate function
  pwm: imx: Rewrite v1 code to facilitate switch to atomic PWM
  pwm: imx: Add separate set of PWM ops for v1 and v2
  pwm: imx: Remove ipg clock and enable per clock when required
  pwm: lpss: Add Intel Gemini Lake PCI ID
  pwm: lpss: Do not export board infos for different PWM types
  pwm: lpss: Avoid reconfiguring while UPDATE bit is still enabled
  pwm: lpss: Switch to new atomic API
  pwm: lpss: Allow duty cycle to be 0
  pwm: lpss: Avoid potential overflow of base_unit
  ...
2017-03-01 09:46:02 -08:00
Benjamin Gaignard
7edf736920 pwm: Add driver for STM32 plaftorm
This driver adds support for PWM driver on STM32 platform.
The SoC have multiple instances of the hardware IP and each
of them could have small differences: number of channels,
complementary output, auto reload register size...

version 9:
- fix commit message header
- remove one space MODULE_ALIAS

version 8:
- fix comments done by Thierry on version 7

version 6:
- change st,breakinput parameter to make it usuable for stm32f7 too.

version 4:
- detect at probe time hardware capabilities
- fix comments done on v2 and v3
- use PWM atomic ops

version 2:
- only keep one comptatible
- use DT parameters to discover hardware block configuration

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2017-01-25 16:11:55 +00:00
Scott Branden
5bf22ff32e pwm: bcm-iproc: Update dependencies for compile-test
Add dependency on COMMON_CLK and allow COMPILE_TEST for broader compile
coverage. Default to Y for IPROC SoCs. This allows the driver to simply
be enabled by selecting PWM.

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
[thierry.reding@gmail.com: reword commit message]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2017-01-19 00:38:17 +01:00
yuanjian
d09f008108 pwm: Add PWM driver for HiSilicon BVT SOCs
Add PWM driver for the PWM controller found on HiSilicon BVT SoCs such
as Hi3519V100, Hi3516CV300, etc. The PWM controller is primarily in
charge of controlling the P-Iris lens.

Reviewed-by: Jiancheng Xue <xuejiancheng@hisilicon.com>
Signed-off-by: Jian Yuan <yuanjian12@hisilicon.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-11-29 16:50:12 +01:00
Neil Armstrong
211ed63075 pwm: Add support for Meson PWM Controller
Add support for the PWM controller found in the Amlogic SoCs. This
driver supports the Meson8b and GXBB SoCs.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-09-08 10:55:00 +02:00
Brian Norris
1f0d3bb027 pwm: Add ChromeOS EC PWM driver
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 <briannorris@chromium.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-07-25 10:40:41 +02:00
Ryo Kodama
48169988cf pwm: rcar: Use ARCH_RENESAS
Replace ARCH_RCAR_GEN{1,2} with ARCH_RENESAS in order to support R-Car Gen3.

Signed-off-by: Ryo Kodama <ryo.kodama.vz@renesas.com>
Signed-off-by: Harunobu Kurokawa <harunobu.kurokawa.dn@renesas.com>
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-07-11 12:49:34 +02:00
Linus Walleij
ef1f09eca7 pwm: Add a driver for the STMPE PWM
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 <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-07-11 12:49:29 +02:00
Yendapally Reddy Dhananjaya Reddy
daa5abc41c pwm: Add support for Broadcom iProc PWM controller
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 <yendapally.reddy@broadcom.com>
[thierry.reding@gmail.com: bunch of coding style fixes, cleanups]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-07-11 12:49:25 +02:00
Simon Horman
03d99531ae pwm: rcar: Depend on ARCH_RENESAS instead of ARCH_SHMOBILE
This is part of an ongoing process to migrate from ARCH_SHMOBILE to
ARCH_RENESAS the motivation for which being that RENESAS seems to be a
more appropriate name than SHMOBILE for the majority of Renesas ARM
based SoCs.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-03-23 17:11:44 +01:00
Vegard Nossum
36d5be4bc9 pwm: add HAS_IOMEM dependency to PWM_FSL_FTM
Ran into this on UML:

drivers/built-in.o: In function `fsl_pwm_probe':
linux/drivers/pwm/pwm-fsl-ftm.c:436: undefined reference to `devm_ioremap_resource'
collect2: error: ld returned 1 exit status

devm_ioremap_resource() is defined only when HAS_IOMEM is selected.

Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Xiubo Li <Li.Xiubo@freescale.com>
Cc: Alison Wang <b18965@freescale.com>
Cc: Jingchang Lu <b35083@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Yuan Yao <yao.yuan@freescale.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2016-01-04 08:55:03 +01:00
Neil Armstrong
6604c6556d pwm: Add PWM driver for OMAP using dual-mode timers
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 <marathon96@gmail.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Joachim Eastwood <manabian@gmail.com>
Suggested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Tony Lindgren <tony@atomide.com>
[thierry.reding@gmail.com: coding style bikeshed, fix timer leak]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-12-16 17:25:37 +01:00
Andy Shevchenko
6f90a00c66 pwm: lpss: Select core part automatically
We have two users of core part right now. Let them to select core part
automatically.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-12-16 16:50:31 +01:00
Andy Shevchenko
912b843904 pwm-pca9685: enable ACPI device found on Galileo Gen2
There is a chip connected to i2c bus on Intel Galileo Gen2 board. Enable it via
ACPI ID INT3492.

Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-11-06 14:14:19 +01:00
YH Huang
7e3b7dc76c pwm: Add MediaTek display PWM driver support
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 <yh.huang@mediatek.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-10-06 16:07:30 +02:00
Vignesh R
25ebc9ec16 pwm: tipwmss: Enable on TI DRA7x and AM437x
TIPWMSS is present on TI's DRA7x and AM437x SoCs. Enable its usage.

Instead of adding each SoC individually, use the more generic symbol
ARCH_OMAP2PLUS instead.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-10-06 16:07:29 +02:00
Florian Fainelli
3a9f595702 pwm: Add Broadcom BCM7038 PWM controller support
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 <f.fainelli@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-10-06 16:07:27 +02:00
Yoshihiro Shimoda
ed6c1476bf pwm: Add support for R-Car PWM Timer
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 <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-10-06 09:40:46 +02:00
Antoine Ténart
59d5c8b153 pwm: Add support for the Berlin PWM controller
Add a PWM controller driver for the Marvell Berlin SoCs. This PWM
controller has 4 channels.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-10-06 09:40:44 +02:00
Linus Torvalds
82278fc079 pwm: Changes for v4.3-rc1
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).
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Merge tag 'pwm/for-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.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
2015-09-09 10:55:32 -07:00
Ariel D'Alessandro
841e6f90bb pwm: NXP LPC18xx PWM/SCT driver
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 <ariel@vanguardiasur.com.ar>
[thierry.reding@gmail.com: remove excessive padding of fields]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-09-09 15:00:33 +02:00
Shobhit Kumar
a3f37a104b pwm: crc: Add Crystalcove (CRC) PWM driver
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 <sameo@linux.intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Paul Bolle <pebolle@tiscali.nl>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Reviewed-by: Varka Bhadram <varkabhadram@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2015-07-21 09:22:23 +02:00
Naidu Tellapati
277bb6a29e pwm: Imagination Technologies PWM DAC driver
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 <abrestic@chromium.org>
Signed-off-by: Naidu Tellapati <Naidu.Tellapati@imgtec.com>
Signed-off-by: Sai Masarapu <Sai.Masarapu@imgtec.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Reviewed-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
[thierry.reding: fixup license header as discussed on list]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-01-30 12:16:04 +01:00
Alexandre Belloni
09853ce7bc pwm: Add Allwinner SoC support
This adds a generic PWM framework driver for the PWM controller
found on Allwinner SoCs.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-01-30 12:16:01 +01:00
Thierry Reding
d2048c4915 pwm: atmel-hlcdc: Depend on HAVE_CLK
The include/linux/clk.h header defines dummy implementations for the
various clk_*() functions if HAVE_CLK is not selected to improve build
coverage in randconfig builds.

The dummy implementation of clk_get_rate() returns 0, which causes the
Atmel HLCDC PWM driver's atmel_hlcdc_pwm_config() implementation to end
up calling:

	do_div(clk_period_ns, 0)

On x86, do_div(n, base) will end up evaluating to this:

	n >>= ilog2(base)

with base = 0, the implementation of ilog2() will call ____ilog2_NaN(),
which is purposely undefined and results in a linker failure:

	ERROR: "____ilog2_NaN" [drivers/pwm/pwm-atmel-hlcdc.ko] undefined!

The implementation of do_div() checks that base is a power of 2 before
calling ilog2(). The compiler doesn't optimize this away, presumably
because is_power_of_2() is an inline function and the compiler doesn't
or can't inspect it closely enough. ilog2() being a macro it still ends
up generating the ____ilog2_NaN() because of the constant 0.

The root of the problem is that the driver really should be checking
before possibly dividing by zero. That should eventually be fixed, but
for now just assume that the clock runs at a sensible frequency when
available.

Reported-by: Jim Davis <jim.epost@gmail.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2015-01-30 12:15:58 +01:00
Abhilash Kesavan
06e4cb6b1d pwm: samsung: Allow Samsung PWM driver to be enabled on Exynos7
To re-use the existing PWM driver for 64-bit ARM based Exynos7 SoC, make
the driver depend on ARCH_EXYNOS along with PLAT_SAMSUNG.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-11-17 12:24:17 +01:00
Boris Brezillon
2b4984bef4 pwm: add support for atmel-hlcdc-pwm device
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 <boris.brezillon@free-electrons.com>
Tested-by: Anthony Harivel <anthony.harivel@emtrion.de>
Tested-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-11-17 12:20:17 +01:00
Bart Tanghe
e5a06dc5ac pwm: Add BCM2835 PWM driver
Add PWM driver for Broadcom BCM2835 processor (Raspberry Pi)

Signed-off-by: Bart Tanghe <bart.tanghe@thomasmore.be>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-11-17 12:20:13 +01:00
Chen Gang
dec02f98ae pwm: Let PWM_CLPS711X depend on HAS_IOMEM
PWM_CLPS711X needs HAS_IOMEM, so depend on it, the related error (with
allmodconfig under um):

    MODPOST 1205 modules
  ERROR: "devm_ioremap_resource" [drivers/pwm/pwm-clps711x.ko] undefined!
  ERROR: "devm_ioremap" [drivers/net/phy/mdio-bcm-unimac.ko] undefined!

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-10-20 09:39:44 +02:00
Andy Shevchenko
ad16202de8 pwm: lpss: make it buildable only on X86
There is no sign of this IP block on non-x86 architectures and rather will not
be. Thus, make this explicit by applying a direct dependency to X86.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-25 11:46:37 +02:00
Andy Shevchenko
c558e39e14 pwm: lpss: Properly split driver to parts
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 <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Alan Cox <alan@linux.intel.com>
[thierry.reding: change select to depends on PWM_LPSS, cleanup]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-23 00:25:47 +02:00
Fabio Estevam
00018a8ae5 pwm: fsl-ftm: Select REGMAP_MMIO
Commit 42fa98a9c3 ("pwm: fsl-ftm: Convert to direct regmap API usage")
introduced the following error when REGMAP_MMIO=n:

drivers/built-in.o: In function `fsl_pwm_probe':
>> pwm-fsl-ftm.c:(.text+0xd7d7): undefined reference to `devm_regmap_init_mmio_clk'

Select select REGMAP_MMIO in order to fix this error.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-22 10:17:01 +02:00
Linus Torvalds
34b20e6df6 pwm: Changes for v3.17-rc1
The set of changes for this merge window contains two new drivers: one
 for Rockchip SoCs and another for STMicroelectronics STiH4xx SoCs. The
 remainder of the changes are the usual small cleanups such as removing
 redundant OOM messages, signalling that a PWM chip's operations can
 sleep and removing an unneeded dependency.
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Merge tag 'pwm/for-3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm changes from Thierry Reding:
 "The set of changes for this merge window contains two new drivers: one
  for Rockchip SoCs and another for STMicroelectronics STiH4xx SoCs.

  The remainder of the changes are the usual small cleanups such as
  removing redundant OOM messages, signalling that a PWM chip's
  operations can sleep and removing an unneeded dependency"

* tag 'pwm/for-3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: rockchip: Added to support for RK3288 SoC
  pwm: rockchip: document RK3288 SoC compatible
  pwm: sti: Remove PWM period table
  pwm: sti: Sync between enable/disable calls
  pwm: sti: Ensure same period values for all channels
  pwm: sti: Fix PWM prescaler handling
  pwm: sti: Supply Device Tree binding documentation for ST's PWM IP
  pwm: sti: Add new driver for ST's PWM IP
  pwm: imx: set can_sleep flag for imx_pwm
  pwm: lpss: remove dependency on clk framework
  pwm: pwm-tipwmss: remove unnecessary OOM messages
  pwm: rockchip: document device tree bindings
  pwm: add Rockchip SoC PWM support
2014-08-08 18:06:29 -07:00
Lee Jones
378fe115d1 pwm: sti: Add new driver for ST's PWM IP
This driver supports all current STi platforms' PWM IPs.

Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
[thierry.reding: rename module to pwm-sti, fix build breakage]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-07 16:18:27 +02:00
Beniamino Galvani
101353c82a pwm: add Rockchip SoC PWM support
This commit adds a driver for the PWM controller found on Rockchip
RK29, RK30 and RK31 SoCs.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-07-11 15:54:51 +02:00
Alexandre Belloni
bb4bbbaae2 PWM: atmel: allow building for AVR32
The Atmel PWM IP can be found on avr32 chips. This allows selecting and building
the driver on avr32.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2014-07-09 15:13:31 +02:00
Tim Kryger
6a4e4bff96 pwm: kona: Introduce Kona PWM controller support
Add support for the six-channel Kona PWM controller found on Broadcom
mobile SoCs like bcm281xx.

Signed-off-by: Tim Kryger <tim.kryger@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:07:44 +02:00
Mika Westerberg
d16a5aa9e8 pwm: add support for Intel Low Power Subsystem PWM
Add support for Intel Low Power I/O subsystem PWM controllers found on
Intel BayTrail SoC.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Chew, Kean Ho <kean.ho.chew@intel.com>
Signed-off-by: Chang, Rebecca Swee Fun <rebecca.swee.fun.chang@intel.com>
Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-01 12:03:40 +02:00
Alexander Shiyan
7eb3f6ffb5 pwm: Add CLPS711X PWM support
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 <shc_work@mail.ru>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-03-18 21:15:16 +01:00
Xiubo Li
b505183b51 pwm: Add Freescale FTM PWM driver support
The FTM PWM device can be found on Vybrid VF610 Tower and
Layerscape LS-1 SoCs.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Alison Wang <b18965@freescale.com>
Signed-off-by: Jingchang Lu <b35083@freescale.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Yuan Yao <yao.yuan@freescale.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-03-18 18:01:56 +01:00
Richard Weinberger
2974b09860 pwm: renesas-tpu: Add dependency on HAS_IOMEM
On archs like S390 or um this driver cannot build nor work.
Make it depend on HAS_IOMEM to bypass build failures.

drivers/built-in.o: In function `tpu_probe':
drivers/pwm/pwm-renesas-tpu.c:421: undefined reference to `devm_ioremap_resource'

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-02-26 16:14:42 +01:00
Linus Torvalds
398b60a8de pwm: Changes for v3.14-rc1
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.
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Merge tag 'pwm/for-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.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
2014-01-27 08:15:51 -08:00
Milo Kim
af66b3c093 pwm: Add LP3943 PWM driver
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 <milo.kim@ti.com>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2014-01-21 08:28:00 +00:00
Bo Shen
32b16d46e4 pwm: atmel-pwm: Add Atmel PWM controller driver
Add a PWM framework driver for the PWM controller found on Atmel SoCs.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
[thierry.reding: coding style and other minor cleanups]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-17 11:26:42 +01:00