| 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. | |
| config PWM_EXYNOS | |
| bool "Enable support for the Exynos PWM" | |
| depends on DM_PWM | |
| help | |
| This PWM is found on Samsung Exynos 5250 and other Samsung SoCs. It | |
| supports a programmable period and duty cycle. A 32-bit counter is | |
| used. It provides 5 channels which can be independently | |
| programmed. Channel 4 (the last) is normally used as a timer. | |
| config PWM_ROCKCHIP | |
| bool "Enable support for the Rockchip PWM" | |
| depends on DM_PWM | |
| help | |
| This PWM is found on RK3288 and other Rockchip SoCs. It supports a | |
| programmable period and duty cycle. A 32-bit counter is used. | |
| Various options provided in the hardware (such as capture mode and | |
| continuous/single-shot) are not supported by the driver. | |
| config PWM_SANDBOX | |
| bool "Enable support for the sandbox PWM" | |
| help | |
| This is a sandbox PWM used for testing. It provides 3 channels and | |
| records the settings passed into it, but otherwise does nothing | |
| useful. The PWM can be enabled but is not connected to any outputs | |
| so this is not very useful. | |
| config PWM_TEGRA | |
| bool "Enable support for the Tegra PWM" | |
| depends on DM_PWM | |
| help | |
| This PWM is found on Tegra 20 and other Nvidia SoCs. It supports | |
| four channels with a programmable period and duty cycle. Only a | |
| 32KHz clock is supported by the driver but the duty cycle is | |
| configurable. | |
| config PWM_MESON | |
| bool "Enable support for the Amlogic Meson PWM" | |
| depends on DM_PWM | |
| help | |
| This PWM is found on Amlogic Meson SoCs. It supports pwm_a/b | |
| pwm_c/d pwm_e/f pwmao_a/b pwmao_c/d channels with a programmable | |
| period and duty cycle. There are 4 clock sources to choose , | |
| it supported by the driver but the duty cycle is configurable. |