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>
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
new file mode 100644
index 0000000..bd47159
--- /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.