diff options
| author | Simon Glass <sjg@chromium.org> | 2016-01-21 19:44:54 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2016-01-21 20:42:36 -0700 |
| commit | fc760cb8c4cc16061079fb45e2e0bad11e5acedc (patch) | |
| tree | d796c4f0ae64c7d5d32b26f4fdcd9a145be5f52f /drivers/pwm | |
| parent | d4bf91ada110aeb26f844cbe95cdb9b1ddb87f19 (diff) | |
| download | u-boot-fc760cb8c4cc16061079fb45e2e0bad11e5acedc.tar.gz u-boot-fc760cb8c4cc16061079fb45e2e0bad11e5acedc.tar.bz2 u-boot-fc760cb8c4cc16061079fb45e2e0bad11e5acedc.zip | |
dm: pwm: Add a PWM uclass
Add a uclass that supports Pulse Width Modulation (PWM) devices. It
provides methods to enable/disable and configure the device.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/pwm/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pwm/pwm-uclass.c | 36 |
3 files changed, 47 insertions, 0 deletions
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig new file mode 100644 index 0000000000..bd47159860 --- /dev/null +++ b/drivers/pwm/Kconfig @@ -0,0 +1,10 @@ +config DM_PWM + bool "Enable support for pulse-width modulation devices (PWM)" + depends on DM + help + A pulse-width modulator emits a pulse of varying width and provides + control over the duty cycle (high and low time) of the signal. This + is often used to control a voltage level. The more time the PWM + spends in the 'high' state, the higher the voltage. The PWM's + frequency/period can be controlled along with the proportion of that + time that the signal is high. diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index c0c4883317..d1b15e5b11 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -10,4 +10,5 @@ #ccflags-y += -DDEBUG +obj-$(CONFIG_DM_PWM) += pwm-uclass.o obj-$(CONFIG_PWM_IMX) += pwm-imx.o pwm-imx-util.o diff --git a/drivers/pwm/pwm-uclass.c b/drivers/pwm/pwm-uclass.c new file mode 100644 index 0000000000..c2200af8a5 --- /dev/null +++ b/drivers/pwm/pwm-uclass.c @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2016 Google, Inc + * Written by Simon Glass <sjg@chromium.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <pwm.h> + +int pwm_set_config(struct udevice *dev, uint channel, uint period_ns, + uint duty_ns) +{ + struct pwm_ops *ops = pwm_get_ops(dev); + + if (!ops->set_config) + return -ENOSYS; + + return ops->set_config(dev, channel, period_ns, duty_ns); +} + +int pwm_set_enable(struct udevice *dev, uint channel, bool enable) +{ + struct pwm_ops *ops = pwm_get_ops(dev); + + if (!ops->set_enable) + return -ENOSYS; + + return ops->set_enable(dev, channel, enable); +} + +UCLASS_DRIVER(pwm) = { + .id = UCLASS_PWM, + .name = "pwm", +}; |