1 config 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 12 config 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 21 config 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 30 config PWM_SANDBOX 31 bool "Enable support for the sandbox PWM" 32 help 33 This is a sandbox PWM used for testing. It provides 3 channels and 34 records the settings passed into it, but otherwise does nothing 35 useful. The PWM can be enabled but is not connected to any outputs 36 so this is not very useful. 37 38 config PWM_TEGRA 39 bool "Enable support for the Tegra PWM" 40 depends on DM_PWM 41 help 42 This PWM is found on Tegra 20 and other Nvidia SoCs. It supports 43 four channels with a programmable period and duty cycle. Only a 44 32KHz clock is supported by the driver but the duty cycle is 45 configurable. 46 47 config PWM_SUNXI 48 bool "Enable support for the Allwinner Sunxi PWM" 49 depends on DM_PWM 50 help 51 This PWM is found on H3, A64 and other Allwinner SoCs. It supports a 52 programmable period and duty cycle. A 16-bit counter is used. 53
