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