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path: root/drivers/pwm/pwm-mxs.c
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* pwm: Add the pwm_is_enabled() helperBoris Brezillon2015-07-201-2/+2
| | | | | | | | | | 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 <boris.brezillon@free-electrons.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
* pwm: mxs: Fix period divider computationGaetan Hug2015-03-111-2/+6
| | | | | | | | | | | | | | | | | | | The driver computes which clock divider it sould be using from the requested period. This computation assumes that the link between the register value and the actual divider value is raising 2 to the power of the registry value. div = 1 << regvalue This is true only for the first 5 values out of 8. Next values are 64, 256 and, 1024 - instead of 32, 64, 128. This affects only the users requesting a period > 0.04369s. Replace the computation with a look-up table. Signed-off-by: Gaetan Hug <ghug@induct.be> Acked-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
* pwm: drop owner assignment from platform_driversWolfram Sang2014-10-201-1/+0
| | | | | | | A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
* pwm: mxs: set pwm_chip can_sleep flagShawn Guo2014-05-211-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The .config() calls clk_get_rate() which might sleep, so we need to set pwm_chip can_sleep flag. Otherwise, we see the following warning when using PWM driven heartbeat led. WARNING: CPU: 0 PID: 0 at kernel/locking/mutex.c:856 mutex_trylock+0x184/0x1a4() DEBUG_LOCKS_WARN_ON(in_interrupt()) Modules linked in: CPU: 0 PID: 0 Comm: swapper Not tainted 3.14.0-rc5 #18 [<c0015420>] (unwind_backtrace) from [<c0012cb0>] (show_stack+0x10/0x14) [<c0012cb0>] (show_stack) from [<c001daf8>] (warn_slowpath_common+0x6c/0x8c) [<c001daf8>] (warn_slowpath_common) from [<c001dbac>] (warn_slowpath_fmt+0x30/0x40) [<c001dbac>] (warn_slowpath_fmt) from [<c045df74>] (mutex_trylock+0x184/0x1a4) [<c045df74>] (mutex_trylock) from [<c0360950>] (clk_prepare_lock+0xc/0xec) [<c0360950>] (clk_prepare_lock) from [<c0362020>] (clk_get_rate+0xc/0x68) [<c0362020>] (clk_get_rate) from [<c028d07c>] (mxs_pwm_config+0x20/0x198) [<c028d07c>] (mxs_pwm_config) from [<c028bde8>] (pwm_config+0x60/0x70) [<c028bde8>] (pwm_config) from [<c034b61c>] (__led_pwm_set+0x1c/0x3c) [<c034b61c>] (__led_pwm_set) from [<c034bc3c>] (led_heartbeat_function+0x70/0x110) [<c034bc3c>] (led_heartbeat_function) from [<c00292f0>] (call_timer_fn+0x7c/0x164) [<c00292f0>] (call_timer_fn) from [<c00295c8>] (run_timer_softirq+0x1f0/0x260) [<c00295c8>] (run_timer_softirq) from [<c002255c>] (__do_softirq+0xc4/0x2f0) [<c002255c>] (__do_softirq) from [<c0022890>] (irq_exit+0xa4/0x10c) [<c0022890>] (irq_exit) from [<c0010240>] (handle_IRQ+0x34/0x84) [<c0010240>] (handle_IRQ) from [<c0013524>] (__irq_svc+0x44/0x54) [<c0013524>] (__irq_svc) from [<c00107f8>] (arch_cpu_idle+0x40/0x48) [<c00107f8>] (arch_cpu_idle) from [<c005deb8>] (cpu_startup_entry+0x70/0x198) [<c005deb8>] (cpu_startup_entry) from [<c060aac8>] (start_kernel+0x2a8/0x2f8) Reported-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Shawn Guo <shawn.guo@freescale.com> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
* pwm: mxs: Remove redundant of_match_ptrSachin Kamat2013-10-081-1/+1
| | | | | | | | | The data structure of_match_ptr() protects is always compiled in. Hence of_match_ptr() is not needed. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Acked-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
* pwm: mxs: Check the return value from stmp_reset_block()Fabio Estevam2013-09-031-1/+7
| | | | | | | | stmp_reset_block() may fail, so let's check its return value and propagate it in the case of error. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
* pwm: Fill in missing .owner fieldsThierry Reding2013-06-121-0/+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 <thierry.reding@gmail.com>
* pwm: mxs: Let device core handle pinctrlFabio Estevam2013-05-271-6/+0
| | | | | | | | | | | | | Since commit ab78029 (drivers/pinctrl: grab default handles from device core), we can rely on device core for handling pinctrl. So remove devm_pinctrl_get_select_default() from the driver. Cc: Thierry Reding <thierry.reding@avionic-design.de> Cc: <linux-kernel@vger.kernel.org> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
* pwm: Constify OF match tablesThierry Reding2013-04-231-1/+1
| | | | | | | | | | A few drivers already annotate this properly. Make the same change for all other OF supporting drivers. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Acked-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
* pwm: mxs: Remove unused *dev from struct mxs_pwm_chipAxel Lin2013-04-021-2/+0
| | | | | | Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
* pwm: Convert to devm_ioremap_resource()Thierry Reding2013-01-221-3/+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 <thierry.reding@avionic-design.de> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* pwm: remove use of __devexitBill Pemberton2012-11-281-1/+1
| | | | | | | | | CONFIG_HOTPLUG is going away as an option so __devexit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Acked-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* pwm: remove use of __devexit_pBill Pemberton2012-11-281-1/+1
| | | | | | | | | CONFIG_HOTPLUG is going away as an option so __devexit_p is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Acked-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* pwm: pwm-mxs: Return proper error if pwmchip_remove() failsAxel Lin2012-07-231-3/+1
| | | | | | Signed-off-by: Axel Lin <axel.lin@gmail.com> Acked-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
* pwm: pwm-mxs: add pinctrl supportShawn Guo2012-07-231-0/+6
| | | | | | | Call pinctrl subsystem to set up pwm pin. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
* pwm: pwm-mxs: use devm_* managed functionsShawn Guo2012-07-231-16/+8
| | | | | | | Use devm_* managed functions to have a clean fail-out. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
* pwm: pwm-mxs: use global reset function stmp_reset_blockShawn Guo2012-07-231-2/+2
| | | | | | | | Use global reset function stmp_reset_block instead of mxs_reset_block to remove <mach/common.h> inclusion. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
* pwm: pwm-mxs: encode soc name in compatible stringShawn Guo2012-07-231-1/+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 <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
* pwm: add pwm-mxs supportShawn Guo2012-07-021-0/+207
Add generic PWM framework driver (DT only) for Freescale MXS. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
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