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path: root/drivers/pwm/pwm-tegra.c
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2019-05-21treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1Thomas Gleixner1-14/+1
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin street fifth floor boston ma 02110 1301 usa this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option [no]_[pad]_[ctrl] any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin street fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 176 file(s). Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Jilayne Lovejoy <[email protected]> Reviewed-by: Steve Winslow <[email protected]> Reviewed-by: Allison Randal <[email protected]> Reviewed-by: Kate Stewart <[email protected]> Cc: [email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
2018-09-26pwm: tegra: Remove gratuituous blank lineThierry Reding1-1/+0
It's common to follow a device tree ID table by the MODULE_DEVICE_TABLE immediately, without an extra blank line between. Signed-off-by: Thierry Reding <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2017-08-21pwm: tegra: Explicitly request exclusive reset controlPhilipp Zabel1-1/+1
Commit a53e35db70d1 ("reset: Ensure drivers are explicit when requesting reset lines") started to transition the reset control request API calls to explicitly state whether the driver needs exclusive or shared reset control behavior. Convert all drivers requesting exclusive resets to the explicit API call so the temporary transition helpers can be removed. No functional changes. Cc: Thierry Reding <[email protected]> Cc: Jonathan Hunter <[email protected]> Cc: [email protected] Cc: [email protected] Signed-off-by: Philipp Zabel <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2017-06-13pwm: tegra: Set maximum pwm clock source per SoC tapeoutLaxman Dewangan1-1/+17
The PWM hardware IP is taped-out with different maximum frequency on different SoCs. From HW team: Before Tegra186, it is 48 MHz. In Tegra186, it is 102 MHz. Add support to limit the clock source frequency to the maximum IP supported frequency. Provide these values via SoC chipdata. Signed-off-by: Laxman Dewangan <[email protected]> Acked-by: Jon Hunter <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2017-04-13pwm: tegra: Read PWM clock source rate in driver initLaxman Dewangan1-1/+6
It is required to know the PWM clock source frequency to calculate the PWM period. In driver, the clock source frequency of the PWM does not get change and, hence, get the clock source frequency in driver init. Get this values later for period calculation from pwm_config(). This will help in avoiding the clock call for getting clock rate in the pwm_config() each time. Signed-off-by: Laxman Dewangan <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2017-04-13pwm: tegra: Avoid potential overflow for short periodsThierry Reding1-6/+4
For very short periods, the result of the division might overflow the unsigned long hz variable (on 32-bit architectures). Avoid that by making it an unsigned long long. While at it, also remove an unneeded local variable whose only purpose is to store a temporary computation. Acked-by: Laxman Dewangan <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2017-04-12pwm: tegra: Add support to configure pin state in suspends/resumeLaxman Dewangan1-0/+18
In some of NVIDIA Tegra's platform, PWM controller is used to control the PWM controlled regulators. PWM signal is connected to the VID pin of the regulator where duty cycle of PWM signal decide the voltage level of the regulator output. When system enters suspend, some PWM client/slave regulator devices require the PWM output to be tristated. Add support to configure the pin state via pinctrl frameworks in suspend and active state of the system. Signed-off-by: Laxman Dewangan <[email protected]> Acked-by: Jon Hunter <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2017-04-12pwm: tegra: Increase precision in PWM rate calculationLaxman Dewangan1-2/+5
The rate of the PWM calculated as follows: hz = NSEC_PER_SEC / period_ns; rate = (rate + (hz / 2)) / hz; This has the precision loss in lower PWM rate. Change this to have more precision as: hz = DIV_ROUND_CLOSEST_ULL(NSEC_PER_SEC * 100, period_ns); rate = DIV_ROUND_CLOSEST(rate * 100, hz) Example: 1. period_ns = 16672000, PWM clock rate is 200 KHz. Based on old formula hz = NSEC_PER_SEC / period_ns = 1000000000ul/16672000 = 59 (59.98) rate = (200K + 59/2)/59 = 3390 Based on new method: hz = 5998 rate = DIV_ROUND_CLOSE(200000*100, 5998) = 3334 If we measure the PWM signal rate, we will get more accurate period with rate value of 3334 instead of 3390. 2. period_ns = 16803898, PWM clock rate is 200 KHz. Based on old formula: hz = 59, rate = 3390 Based on new formula: hz = 5951, rate = 3360 The PWM signal rate of 3360 is more near to requested period than 3333. Signed-off-by: Laxman Dewangan <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2017-04-12pwm: tegra: Use DIV_ROUND_CLOSEST_ULL() instead of local implementationLaxman Dewangan1-2/+1
Use macro DIV_ROUND_CLOSEST_ULL() for 64-bit division to closest one instead of implementing the same locally. This increase readability. Signed-off-by: Laxman Dewangan <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2016-07-11pwm: tegra: Add support for Tegra186Laxman Dewangan1-3/+19
Tegra186 has multiple PWM controllers with only one output instead of one controller with four outputs in earlier SoC generations. Add support for Tegra186 and detect the number of PWM outputs using device tree match data. Signed-off-by: Laxman Dewangan <[email protected]> Reviewed-by: Alexandre Courbot <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2016-07-11pwm: tegra: Avoid overflow when calculating duty cycleHyong Bin Kim1-2/+3
duty_ns * (1 << PWM_DUTY_WIDTH) could overflow in integer calculation when the PWM rate is low. Hence do all calculation on unsigned long long to avoid overflow. Signed-off-by: Hyong Bin Kim <[email protected]> Signed-off-by: Laxman Dewangan <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2016-07-11pwm: tegra: Allow 100 % duty cycleVictor(Weiguo) Pan1-1/+1
To get 100 % duty cycle (always high), pulse width needs to be set to 256. Signed-off-by: Victor(Weiguo) Pan <[email protected]> Signed-off-by: Laxman Dewangan <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2016-07-11pwm: tegra: Add support for reset controlRohith Seelaboyina1-0/+20
Add reset control of the PWM controller to reset it before accessing the PWM register. Signed-off-by: Rohith Seelaboyina <[email protected]> Signed-off-by: Laxman Dewangan <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2016-07-11pwm: tegra: Rename mmio_base to regsThierry Reding1-6/+6
The former is much longer to type and is ambiguous because the value stored in the field is not the (physical) base address of the memory- mapped I/O registers, but the virtual address of those registers as mapped through the MMU. Signed-off-by: Thierry Reding <[email protected]>
2016-07-11pwm: tegra: Remove useless paddingThierry Reding1-4/+4
Use single spaces to separate data type from field names in structure definitions. Signed-off-by: Thierry Reding <[email protected]>
2016-07-11pwm: tegra: Drop NUM_PWM macroThierry Reding1-5/+3
This macro is used to initialize the ->npwm field of the PWM chip. Use a literal instead and make all other places rely on ->npwm. Signed-off-by: Thierry Reding <[email protected]>
2015-07-20pwm: Add the pwm_is_enabled() helperBoris Brezillon1-3/+3
Some PWM drivers are testing the PWMF_ENABLED flag. Create a helper function to hide the logic behind enabled test. This will allow us to smoothly move from the current approach to an atomic PWM update approach. Signed-off-by: Boris Brezillon <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2015-02-18pwm: tegra: Use NSEC_PER_SECThierry Reding1-1/+1
Instead of using the literal value for the number of nanoseconds per second, use the macro instead to increase readability. Signed-off-by: Thierry Reding <[email protected]>
2014-10-20pwm: drop owner assignment from platform_driversWolfram Sang1-1/+0
A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <[email protected]>
2014-04-28pwm: tegra: Remove unnecessary OOM messagesJingoo Han1-3/+1
The site-specific OOM messages are unnecessary, because they duplicate the MM subsystem generic OOM message. Signed-off-by: Jingoo Han <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2013-06-12pwm: Fill in missing .owner fieldsThierry Reding1-0/+1
Some drivers don't set the .owner fields of the struct device_driver or struct pwm_ops, which causes the module usage count to become wrong. Signed-off-by: Thierry Reding <[email protected]>
2013-05-18drivers/pwm: don't check resource with devm_ioremap_resourceWolfram Sang1-5/+0
devm_ioremap_resource does sanity checks on the given resource. No need to duplicate this in the driver. Signed-off-by: Wolfram Sang <[email protected]> Acked-by: Stephen Warren <[email protected]>
2013-04-23pwm: Constify OF match tablesThierry Reding1-1/+1
A few drivers already annotate this properly. Make the same change for all other OF supporting drivers. Signed-off-by: Thierry Reding <[email protected]> Acked-by: Shawn Guo <[email protected]> Acked-by: Alexandre Pereira da Silva <[email protected]> Acked-by: Viresh Kumar <[email protected]>
2013-02-26Merge tag 'for-3.9-rc1' of git://gitorious.org/linux-pwm/linux-pwmLinus Torvalds1-3/+1
Pull PWM changes from Thierry Reding: "A new driver has been added to support the PWM mode of the timer counter blocks found on Atmel AT91 SoCs. The VT8500 driver now supports changing the PWM signal polarity and the TI drivers (EHRPWM and ECAP) gained suspend and resume functionality. User drivers can now query the core for whether access to a PWM device will sleep (if the PWM chip is on a slow bus such as I2C or SPI). The pwm-backlight driver now handles the backlight BL_CORE_FBBLANK state in addition to the FB layer's blanking states. To round things off, a few fixes and cleanups are also included" * tag 'for-3.9-rc1' of git://gitorious.org/linux-pwm/linux-pwm: pwm: twl: Use to_twl() instead of container_of() pwm: tegra: assume CONFIG_OF pwm_backlight: Validate dft_brightness in main probe function pwm: Export pwm_{set,get}_chip_data() pwm: Make Kconfig entries more consistent pwm: Add can_sleep property to drivers pwm: Add pwm_can_sleep() as exported API to users pwm-backlight: handle BL_CORE_FBBLANK state pwm: pwm-tiecap: Low power sleep support pwm: pwm-tiehrpwm: Low power sleep support pwm: pwm-tiehrpwm: Update the clock handling of pwm-tiehrpwm driver pwm: vt8500: Add polarity support pwm: vt8500: Register write busy test performed incorrectly pwm: atmel: add Timer Counter Block PWM driver
2013-02-15pwm: tegra: assume CONFIG_OFStephen Warren1-3/+1
Tegra only supports, and always enables, device tree. Remove all ifdefs for DT support from the driver. Signed-off-by: Stephen Warren <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2013-01-22pwm: Convert to devm_ioremap_resource()Thierry Reding1-3/+3
Convert all uses of devm_request_and_ioremap() to the newly introduced devm_ioremap_resource() which provides more consistent error handling. Signed-off-by: Thierry Reding <[email protected]> Acked-by: Viresh Kumar <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2012-11-28pwm: remove use of __devexitBill Pemberton1-1/+1
CONFIG_HOTPLUG is going away as an option so __devexit is no longer needed. Signed-off-by: Bill Pemberton <[email protected]> Acked-by: Thierry Reding <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2012-11-28pwm: remove use of __devexit_pBill Pemberton1-1/+1
CONFIG_HOTPLUG is going away as an option so __devexit_p is no longer needed. Signed-off-by: Bill Pemberton <[email protected]> Acked-by: Thierry Reding <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2012-08-17pwm: Remove a redundant error message when devm_request_and_ioremap failsAxel Lin1-3/+1
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]>
2012-07-23pwm: 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]>
2012-07-02pwm: tegra: Add device tree supportThierry Reding1-0/+11
Add auxdata to instantiate the PWFM controller from a device tree, include the corresponding nodes in the dtsi files for Tegra 20 and Tegra 30 and add binding documentation. Acked-by: Stephen Warren <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2012-07-02pwm: Add NVIDIA Tegra SoC supportThierry Reding1-0/+254
This commit adds a generic PWM framework driver for the PWFM controller found on NVIDIA Tegra SoCs. The driver is based on code from the Chromium kernel tree and was originally written by Gary King (NVIDIA) and later modified by Simon Que (Chromium). Acked-by: Stephen Warren <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
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