xref: /openbmc/u-boot/drivers/pwm/Kconfig (revision 51cb23d4)
1config DM_PWM
2	bool "Enable support for pulse-width modulation devices (PWM)"
3	depends on DM
4	help
5	  A pulse-width modulator emits a pulse of varying width and provides
6	  control over the duty cycle (high and low time) of the signal. This
7	  is often used to control a voltage level. The more time the PWM
8	  spends in the 'high' state, the higher the voltage. The PWM's
9	  frequency/period can be controlled along with the proportion of that
10	  time that the signal is high.
11
12config PWM_EXYNOS
13	bool "Enable support for the Exynos PWM"
14	depends on DM_PWM
15	help
16	  This PWM is found on Samsung Exynos 5250 and other Samsung SoCs. It
17	  supports a programmable period and duty cycle. A 32-bit counter is
18	  used. It provides 5 channels which can be independently
19	  programmed. Channel 4 (the last) is normally used as a timer.
20
21config PWM_ROCKCHIP
22	bool "Enable support for the Rockchip PWM"
23	depends on DM_PWM
24	help
25	  This PWM is found on RK3288 and other Rockchip SoCs. It supports a
26	  programmable period and duty cycle. A 32-bit counter is used.
27	  Various options provided in the hardware (such as capture mode and
28	  continuous/single-shot) are not supported by the driver.
29
30config PWM_TEGRA
31	bool "Enable support for the Tegra PWM"
32	depends on DM_PWM
33	help
34	  This PWM is found on Tegra 20 and other Nvidia SoCs. It supports
35	  four channels with a programmable period and duty cycle. Only a
36	  32KHz clock is supported by the driver but the duty cycle is
37	  configurable.
38