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: NBrian Norris <briannorris@chromium.org>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

Replace ARCH_RCAR_GEN{1,2} with ARCH_RENESAS in order to support R-Car Gen3.
Signed-off-by: NRyo Kodama <ryo.kodama.vz@renesas.com>
Signed-off-by: NHarunobu Kurokawa <harunobu.kurokawa.dn@renesas.com>
Signed-off-by: NUlrich Hecht <ulrich.hecht+renesas@gmail.com>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NYendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>
[thierry.reding@gmail.com: bunch of coding style fixes, cleanups]
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NSimon Horman <horms+renesas@verge.net.au>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NVegard 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: NThierry Reding <thierry.reding@gmail.com>

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: NTony Lindgren <tony@atomide.com>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Acked-by: NTony Lindgren <tony@atomide.com>
[thierry.reding@gmail.com: coding style bikeshed, fix timer leak]
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

We have two users of core part right now. Let them to select core part
automatically.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NYH Huang <yh.huang@mediatek.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NVignesh R <vigneshr@ti.com>
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: NSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

Add a PWM controller driver for the Marvell Berlin SoCs. This PWM
controller has 4 channels.
Signed-off-by: NAntoine Tenart <antoine.tenart@free-electrons.com>
Acked-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NAriel D'Alessandro <ariel@vanguardiasur.com.ar>
[thierry.reding@gmail.com: remove excessive padding of fields]
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NShobhit Kumar <shobhit.kumar@intel.com>
Reviewed-by: NVarka Bhadram <varkabhadram@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

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: NAndrew Bresticker <abrestic@chromium.org>
Signed-off-by: NNaidu Tellapati <Naidu.Tellapati@imgtec.com>
Signed-off-by: NSai Masarapu <Sai.Masarapu@imgtec.com>
Signed-off-by: NEzequiel Garcia <ezequiel.garcia@imgtec.com>
Reviewed-by: NVladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
[thierry.reding: fixup license header as discussed on list]
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

This adds a generic PWM framework driver for the PWM controller
found on Allwinner SoCs.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NJim Davis <jim.epost@gmail.com>
Acked-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NAbhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NBoris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: NAnthony Harivel <anthony.harivel@emtrion.de>
Tested-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Acked-by: NThierry Reding <thierry.reding@gmail.com>
Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

Add PWM driver for Broadcom BCM2835 processor (Raspberry Pi)
Signed-off-by: NBart Tanghe <bart.tanghe@thomasmore.be>
Acked-by: NStephen Warren <swarren@wwwdotorg.org>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NChen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: NAlan Cox <alan@linux.intel.com>
[thierry.reding: change select to depends on PWM_LPSS, cleanup]
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

Commit 42fa98a9 ("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: Nkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

This driver supports all current STi platforms' PWM IPs.
Signed-off-by: NAjit Pal Singh <ajitpal.singh@st.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>
[thierry.reding: rename module to pwm-sti, fix build breakage]
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

This commit adds a driver for the PWM controller found on Rockchip
RK29, RK30 and RK31 SoCs.
Signed-off-by: NBeniamino Galvani <b.galvani@gmail.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

The Atmel PWM IP can be found on avr32 chips. This allows selecting and building
the driver on avr32.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

Add support for the six-channel Kona PWM controller found on Broadcom
mobile SoCs like bcm281xx.
Signed-off-by: NTim Kryger <tim.kryger@linaro.org>
Reviewed-by: NAlex Elder <elder@linaro.org>
Reviewed-by: NMarkus Mayer <markus.mayer@linaro.org>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

Add support for Intel Low Power I/O subsystem PWM controllers found on
Intel BayTrail SoC.
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: NChew, Kean Ho <kean.ho.chew@intel.com>
Signed-off-by: NChang, Rebecca Swee Fun <rebecca.swee.fun.chang@intel.com>
Signed-off-by: NChew, Chiau Ee <chiau.ee.chew@intel.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

The FTM PWM device can be found on Vybrid VF610 Tower and
Layerscape LS-1 SoCs.
Signed-off-by: NXiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: NAlison Wang <b18965@freescale.com>
Signed-off-by: NJingchang Lu <b35083@freescale.com>
Reviewed-by: NSascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: NYuan Yao <yao.yuan@freescale.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NRichard Weinberger <richard@nod.at>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NMilo Kim <milo.kim@ti.com>
Acked-by: NThierry Reding <thierry.reding@gmail.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

Add a PWM framework driver for the PWM controller found on Atmel SoCs.
Signed-off-by: NBo Shen <voice.shen@atmel.com>
Acked-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: NJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
[thierry.reding: coding style and other minor cleanups]
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

REGMAP_I2C is not a visible config option.
Thus make PWM_PCA9685 depend on I2c and then select REGMAP_I2C.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NSteffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

This helps increasing build testing coverage.

Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-pwm@vger.kernel.org
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: NSimon Horman <horms@verge.net.au>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>

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: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Tested-by: NSimon Horman <horms@verge.net.au>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>