projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| fc760cb8 SG |
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. | |
| 0e23fd81 | 11 | |
| 5c2dd4cd SG |
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 | ||
| 0e23fd81 SG |
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. | |
| 41fa035c SG |
29 | |
| 30 | config PWM_TEGRA | |
| 31 | bool "Enable support for the Tegra PWM" | |
| 91c08afe | 32 | depends on DM_PWM |
| 41fa035c SG |
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. |