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Commit | Line | Data |
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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. |