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_ROCKCHIP 13 bool "Enable support for the Rockchip PWM" 14 depends on DM_PWM 15 help 16 This PWM is found on RK3288 and other Rockchip SoCs. It supports a 17 programmable period and duty cycle. A 32-bit counter is used. 18 Various options provided in the hardware (such as capture mode and 19 continuous/single-shot) are not supported by the driver. 20 21config PWM_TEGRA 22 bool "Enable support for the Tegra PWM" 23 depends on DM_PWM 24 help 25 This PWM is found on Tegra 20 and other Nvidia SoCs. It supports 26 four channels with a programmable period and duty cycle. Only a 27 32KHz clock is supported by the driver but the duty cycle is 28 configurable. 29