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2012-11-22pwm: Add SPEAr PWM chip driver supportShiraz Hashim3-0/+288
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 <[email protected]> Signed-off-by: Shiraz Hashim <[email protected]> Signed-off-by: Viresh Kumar <[email protected]> Reviewed-by: Vipin Kumar <[email protected]> Acked-by: Viresh Kumar <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-11-01pwm: vt8500: Update vt8500 PWM driver supportTony Prisk1-23/+63
This patch updates pwm-vt8500.c to support devicetree probing and make use of the common clock subsystem. A binding document describing the PWM controller found on arch-vt8500 is also included. Signed-off-by: Tony Prisk <[email protected]> Acked-by: Arnd Bergmann <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-10-10Merge tag 'for-3.7-rc1' of git://gitorious.org/linux-pwm/linux-pwmLinus Torvalds12-131/+904
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 ...
2012-10-05pwm: Check for negative duty-cycle and periodThierry Reding6-12/+3
Make sure the duty-cycle and period passed in are not negative. This should eventually be made implicit by making them unsigned. While at it, the drivers' .config() implementations can have the equivalent checks removed. Signed-off-by: Thierry Reding <[email protected]> Cc: Shawn Guo <[email protected]> Cc: Mark Brown <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Sachin Kamat <[email protected]> Cc: Axel Lin <[email protected]> Cc: Kukjin Kim <[email protected]> Cc: Jingoo Han <[email protected]> Cc: Jonghwan Choi <[email protected]> Cc: Sascha Hauer <[email protected]> Cc: "Philip, Avinash" <[email protected]> Cc: Vaibhav Bedia <[email protected]> Acked-by: Jingoo Han <[email protected]>
2012-10-05pwm: Add Ingenic JZ4740 supportThierry Reding3-1/+232
This commit moves the driver to drivers/pwm and converts it to the new PWM framework. Signed-off-by: Thierry Reding <[email protected]> Acked-by: Lars-Peter Clausen <[email protected]> Tested-by: Lars-Peter Clausen <[email protected]> Acked-by: Ralf Baechle <[email protected]>
2012-10-05pwm: Move PUV3 PWM driver to PWM frameworkThierry Reding3-1/+172
This commit moves the driver to drivers/pwm and converts it to the new PWM framework. Signed-off-by: Thierry Reding <[email protected]> Tested-by: Qin Rui <[email protected]> Acked-by: Guan Xuetao <[email protected]>
2012-10-05Merge tag 'mfd-3.7-1' of ↵Linus Torvalds3-0/+194
git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6 Pull MFD changes from Samuel Ortiz: "MFD bits for the 3.7 merge window. As usual we have a few new drivers: - TI LP8788 - TI OMAP USB TLL - Maxim MAX8907 - SMSC ECE1099 - Dialog Semiconductor DA9055 - A simpler syscon driver that allow us to get rid of the anatop one. Drivers are also gradually getting Device Tree and IRQ domain support. The following drivers got DT support: - palmas, 88pm860x, tc3589x and twl4030-audio And those ones now use the IRQ domain APIs: - 88pm860x, tc3589x, db8500_prcmu Also some other interesting changes: - Intel's ICH LPC now supports Lynx Point - TI's twl4030-audio added a GPO child - tps6527 enabled its backlight subdevice - The twl6030 pwm driver moved to the new PWM subsystem And finally a bunch of cleanup and casual fixes for mc13xxx, 88pm860x, palmas, ab8500, wm8994, wm5110, max8907 and the tps65xxx family." Fix up various annoying conflicts: the DT and IRQ domain support came in twice and was already in 3.6. And then it was apparently rebased. Guys, DON'T REBASE! * tag 'mfd-3.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6: (89 commits) ARM: dts: Enable 88pm860x pmic mfd: 88pm860x: Move gpadc init into touch mfd: 88pm860x: Device tree support mfd: 88pm860x: Use irqdomain mfd: smsc: Add support for smsc gpio io/keypad driver backlight: tps65217_bl: Add missing platform_set_drvdata in tps65217_bl_probe mfd: DA9055 core driver mfd: tps65910: Add alarm interrupt of TPS65910 RTC to mfd device list mfd: wm5110: Add register patches for revision B mfd: wm5110: Disable control interface error report for WM5110 rev B mfd: max8907: Remove regulator-compatible from DT docs backlight: Add TPS65217 WLED driver mfd: Add backlight as subdevice to the tps65217 mfd: Provide the PRCMU with its own IRQ domain mfd: Fix max8907 sparse warning mfd: Add lp8788 mfd driver mfd: dbx500: Provide a more accurate smp_twd clock mfd: rc5t583: Fix warning messages regulator: palmas: Add DT support mfd: palmas: Change regulator defns to better suite DT ...
2012-09-20pwm: Move AB8500 PWM driver to PWM frameworkThierry Reding3-0/+163
This commit moves the driver to drivers/pwm and converts it to the new PWM framework. Signed-off-by: Thierry Reding <[email protected]> Acked-by: Linus Walleij <[email protected]> Acked-by: Arnd Bergmann <[email protected]> Acked-by: Arun Murthy <[email protected]>
2012-09-19pwm: Move TWL6030 PWM driver to PWM frameworkThierry Reding3-0/+194
This commit moves the driver to drivers/pwm and converts it to the new PWM framework. In order for this to work properly, register the PWM as child of the multi-function TWL6030 device. Signed-off-by: Thierry Reding <[email protected]> Acked-by: Peter Ujfalusi <[email protected]> Signed-off-by: Samuel Ortiz <[email protected]>
2012-09-12pwm: i.MX: fix clock lookupPhilipp Zabel1-8/+27
The i.MX PWM core has two clocks: The ipg clock and the ipg highfreq (peripheral) clock. The ipg clock has to be enabled for this hardware to work. The actual PWM output can either be driven by the ipg clock or the ipg highfreq. The ipg highfreq has the advantage that it runs even when the SoC is in low power modes. This patch requests both clocks and enables the ipg clock for accessing registers and the peripheral clock to actually turn on the PWM. Signed-off-by: Philipp Zabel <[email protected]> Signed-off-by: Sascha Hauer <[email protected]> Reviewed-by: Shawn Guo <[email protected]> Reviewed-by: Benoît Thébaudeau <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-12pwm: i.MX: use per clock unconditionallySascha Hauer1-7/+1
The i.MX PWM module has two clocks: The ipg clock and the ipg highfreq (peripheral) clock. The ipg clock has to be enabled for this hardware to work. The actual PWM output can either be driven by the ipg clock or the ipg highfreq. The ipg highfreq has the advantage that it runs even when the SoC is in low power modes. Use the always running clock also on i.MX25. Signed-off-by: Sascha Hauer <[email protected]> Reviewed-by: Shawn Guo <[email protected]> Reviewed-by: Benoît Thébaudeau <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-12pwm: i.MX: add devicetree supportPhilipp Zabel1-9/+35
At the same time remove platform based support. No user for this driver has made it into mainline so far, so all we break is out of tree stuff. Signed-off-by: Philipp Zabel <[email protected]> Signed-off-by: Sascha Hauer <[email protected]> Reviewed-by: Shawn Guo <[email protected]> Reviewed-by: Benoît Thébaudeau <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-12pwm: i.MX: Use module_platform_driverSascha Hauer1-11/+1
Signed-off-by: Sascha Hauer <[email protected]> Reviewed-by: Shawn Guo <[email protected]> Reviewed-by: Benoît Thébaudeau <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-12pwm: i.MX: add functions to enable/disable pwm.Sascha Hauer1-4/+44
We used to enable/disable the PWM only by switching the clock on or off. Instead, use the dedicated register bits. These differ on different SoCs, so introduce a SoC specific function for this. Signed-off-by: Sascha Hauer <[email protected]> Reviewed-by: Shawn Guo <[email protected]> Reviewed-by: Benoît Thébaudeau <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-12pwm: i.MX: remove unnecessary if in pwm_[en|dis]ableSascha Hauer1-14/+11
The PWM core makes sure that pwm_enable/disable are called only once. Still keep the enabled state since we will need it in pwm_config. Signed-off-by: Sascha Hauer <[email protected]> Reviewed-by: Shawn Guo <[email protected]> Reviewed-by: Benoît Thébaudeau <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-12pwm: i.MX: factor out SoC specific functionsSascha Hauer1-63/+83
To cleanup the code and to make it easier to support different SoCs. Signed-off-by: Sascha Hauer <[email protected]> Reviewed-by: Shawn Guo <[email protected]> Reviewed-by: Benoît Thébaudeau <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-10pwm: pwm-tiehrpwm: Add support for configuring polarity of PWMPhilip, Avinash1-22/+51
EHRPWM hardware supports polarity configuration of PWM output. However configuration of polarity done in hardware only in .enable() to ensure PWM output present only after enabling PWM. This commit adds support for polarity configuration for EHRPWM. When being here, remove configuring of polarity during .config() and do it explicitly from .set_polarity(). Signed-off-by: Philip, Avinash <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-10pwm: pwm-tiecap: Add support for configuring polarity of PWMPhilip, Avinash1-0/+22
ECAP APWM hardware supports polarity configuration of PWM output. This commit adds support for polarity configuration of ECAP APWM. Signed-off-by: Philip, Avinash <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-10pwm: add devm_pwm_get() and devm_pwm_put()Alexandre Courbot1-0/+58
Add resource managed variants of pwm_get() and pwm_put() for convenience. Code is largely inspired by the equivalent devm functions of the regulator framework. Signed-off-by: Alexandre Courbot <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-10pwm: Add support for configuring the PWM polarityPhilip, Avinash1-0/+22
Some hardware supports inverting the polarity of the PWM signal. This commit adds support to the PWM framework to allow users of the PWM API to configure the polarity. Note that in order to reduce complexity, changing the polarity of a PWM signal is only allowed while the PWM is disabled. A practical example where this can prove useful is to simulate inversion of the duty cycle. While inversion of polarity and duty cycle are not exactly the same, the differences for most use-cases are negligible. Signed-off-by: Philip, Avinash <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-10pwm: pwm-tiehrpwm: Fix conflicting channel period settingPhilip, Avinash1-0/+29
EHRPWM hardware supports 2 independent PWM channels. However the device uses only one register to handle period setting for both channels. So both channels should be configured for same period (in nsec). Fix the same by returning error for conflicting period values. However, allow 1. Configuration of period settings if not conflicting with other channels 2. Re-configuring of period settings if no other channels being configured Signed-off-by: Philip, Avinash <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-09-10pwm: pwm-tiecap: Disable APWM mode after configurePhilip, Avinash1-0/+7
APWM mode is enabled while configuring PWM device. This was done to handle shadow & immediate mode update of period and compare registers. However, leaving it enabled after configuring will cause APWM output on PWM pin even before enabling PWM device. Fix the same by disabling APWM mode after configuring if PWM device is not running. Signed-off-by: Philip, Avinash <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-08-20pwm: Improve Kconfig help textThierry Reding1-6/+25
The Kconfig help text should help the user understand what functionality is provided by an option. This is especially true for new subsystems. An improved help text is provided by this commit in the hopes of clarifying the usefulness of the PWM framework. Signed-off-by: Thierry Reding <[email protected]> Acked-by: Borislav Petkov <[email protected]>
2012-08-17pwm: core: Fix coding style issuesSachin Kamat1-4/+4
Fixes the following: WARNING: line over 80 characters ERROR: spaces required around that ':' (ctx:VxW) WARNING: Prefer pr_warn(... to pr_warning(... Signed-off-by: Sachin Kamat <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-08-17pwm: vt8500: Fix coding style issueSachin Kamat1-1/+1
Fixes the following: WARNING: Prefer pr_warn(... to pr_warning(... pr_warning("Waiting for status bits 0x%x to clear timed out\n", Signed-off-by: Sachin Kamat <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-08-17pwm: Remove a redundant error message when devm_request_and_ioremap failsAxel Lin3-9/+3
The implementation in devm_request_and_ioremap() already shows error message, so no need to show dev_err again if devm_request_and_ioremap() fails. Signed-off-by: Axel Lin <[email protected]> Cc: Stephen Warren <[email protected]> Cc: Philip, Avinash <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-08-17pwm: samsung: add missing device pointer to struct pwm_chipJingoo Han1-0/+1
This patch adds missing device pointer to struct pwm_chip. If the device pointer is NULL, pwmchip_add() will return error. Signed-off-by: Jingoo Han <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-08-17pwm: Add missing static storage class specifiers in core.c fileSachin Kamat1-2/+2
Fixes the following sparse warnings: drivers/pwm/core.c:152:6: warning: symbol 'of_pwmchip_add' was not declared. Should it be static? drivers/pwm/core.c:165:6: warning: symbol 'of_pwmchip_remove' was not declared. Should it be static? Signed-off-by: Sachin Kamat <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-26pwm: pwm-tiehrpwm: PWM driver support for EHRPWMPhilip, Avinash3-0/+422
Enhanced high resolution PWM module (EHRPWM) hardware can be used to generate PWM output over 2 channels. This commit adds PWM driver support for EHRPWM device present on AM33XX SOC. Current implementation supports simple PWM functionality. Reviewed-by: Vaibhav Bedia <[email protected]> Signed-off-by: Philip, Avinash <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-26pwm: pwm-tiecap: PWM driver support for ECAP APWMPhilip, Avinash3-0/+243
ECAP hardware on AM33XX SOC supports auxiliary PWM (APWM) feature. This commit adds PWM driver support for ECAP hardware on AM33XX SOC. In the ECAP hardware, each PWM pin can also be configured to be in capture mode. Current implementation only supports PWM mode of operation. Also, hardware supports sync between multiple PWM pins but the driver supports simple independent PWM functionality. Reviewed-by: Vaibhav Bedia <[email protected]> Signed-off-by: Philip, Avinash <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: fix used-uninitialized warning in pwm_get()Thierry Reding1-1/+1
Some versions of GCC don't seem no notice that the initialization of the index variable is tied to that of the chip variable and falsely report it as potentially being used uninitialized. However, to save anybody else from tripping over this, we now initialize the index variable unconditionally. Originally-by: Stephen Warren <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: add lpc32xx PWM supportAlexandre Pereira da Silva3-0/+159
Add lpc32xx SOC PWM driver. Signed-off-by: Alexandre Pereira da Silva <[email protected]> Acked-by: Roland Stigge <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: Use pr_* functions in pwm-samsung.c fileSachin Kamat1-2/+4
Replace printk with pr_* functions to avoid checkpatch warnings. Signed-off-by: Sachin Kamat <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: Convert pwm-samsung to use devm_* APIsAxel Lin1-18/+6
Signed-off-by: Axel Lin <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: Convert pwm-tegra to use devm_clk_get()Axel Lin1-6/+2
Also return proper error in tegra_pwm_remove() if pwmchip_remove() fails. Signed-off-by: Axel Lin <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: pwm-mxs: Return proper error if pwmchip_remove() failsAxel Lin1-3/+1
Signed-off-by: Axel Lin <[email protected]> Acked-by: Shawn Guo <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: pwm-bfin: Return proper error if pwmchip_remove() failsAxel Lin1-3/+1
Signed-off-by: Axel Lin <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: pxa: Propagate pwmchip_remove() errorThierry Reding1-2/+1
If the pwmchip_remove() call fails, propagate the error to the driver's remove callback. This is required to prevent the module from being unloaded if a PWM provided by the driver is still in use. Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: Convert pwm-pxa to use devm_* APIsAxel Lin1-39/+10
Signed-off-by: Axel Lin <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: Convert pwm-vt8500 to use devm_* APIsAxel Lin1-39/+8
Signed-off-by: Axel Lin <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: Convert pwm-imx to use devm_* APIsAxel Lin1-47/+10
Signed-off-by: Axel Lin <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: Conflict with legacy PWM APIThierry Reding1-0/+1
In order to avoid duplicate symbols with legacy PWM API implementations, the new PWM framework needs to conflict with any of the existing legacy implementations. This is done in two ways: for implementations provided by drivers, a conflict is added to the driver to ensure it will have to be ported to the PWM subsystem before it can coexist with other PWM providers. For architecture-specific code, the conflict is added to the PWM symbol to avoid confusion when a previously picked platform or machine can no longer be selected because of the PWM subsystem being included. Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: pwm-mxs: add pinctrl supportShawn Guo1-0/+6
Call pinctrl subsystem to set up pwm pin. Signed-off-by: Shawn Guo <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: pwm-mxs: use devm_* managed functionsShawn Guo1-16/+8
Use devm_* managed functions to have a clean fail-out. Signed-off-by: Shawn Guo <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: pwm-mxs: use global reset function stmp_reset_blockShawn Guo2-2/+3
Use global reset function stmp_reset_block instead of mxs_reset_block to remove <mach/common.h> inclusion. Signed-off-by: Shawn Guo <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-23pwm: pwm-mxs: encode soc name in compatible stringShawn Guo1-1/+1
Encode soc name in the compatible string to know the specific version hardware block. This is the general approach adopted for most bindings. Change mxs-pwm binding to use the approach. Signed-off-by: Shawn Guo <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-02pwm: add pwm-mxs supportShawn Guo3-0/+217
Add generic PWM framework driver (DT only) for Freescale MXS. Signed-off-by: Sascha Hauer <[email protected]> Signed-off-by: Shawn Guo <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-02ARM vt8500: Move vt8500 pwm driver to pwm frameworkSascha Hauer3-0/+218
Move the driver to drivers/pwm/ and convert it to use the framework. Signed-off-by: Sascha Hauer <[email protected]> Cc: Alexey Charkov <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-02ARM Samsung: Move s3c pwm driver to pwm frameworkSascha Hauer3-0/+376
Move the driver to drivers/pwm/ and convert it to use the framework. Signed-off-by: Sascha Hauer <[email protected]> Cc: Ben Dooks <[email protected]> Cc: Kukjin Kim <[email protected]> [[email protected]: fix pwmchip_add return code test] Signed-off-by: Eric Bénard <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-02ARM i.MX: Move i.MX pwm driver to pwm frameworkSascha Hauer3-0/+277
Move the driver to drivers/pwm/ and convert it to use the framework. Signed-off-by: Sascha Hauer <[email protected]> [[email protected]: set chip.dev to prevent probe failure] [[email protected]: fix pwmchip_add return code test] Signed-off-by: Eric Bénard <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
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