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authorSimon Glass <sjg@chromium.org>2016-01-21 19:44:54 -0700
committerSimon Glass <sjg@chromium.org>2016-01-21 20:42:36 -0700
commitfc760cb8c4cc16061079fb45e2e0bad11e5acedc (patch)
treed796c4f0ae64c7d5d32b26f4fdcd9a145be5f52f /drivers/pwm
parentd4bf91ada110aeb26f844cbe95cdb9b1ddb87f19 (diff)
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/Kconfig10
-rw-r--r--drivers/pwm/Makefile1
-rw-r--r--drivers/pwm/pwm-uclass.c36
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",
+};