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Simon Glassfc760cb2016-01-21 19:44:54 -07001config 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.
Simon Glass0e23fd82016-01-21 19:44:55 -070011
Simon Glass5c2dd4c2016-02-21 21:08:49 -070012config 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
Simon Glass0e23fd82016-01-21 19:44:55 -070021config 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.
Simon Glass41fa0352016-01-30 16:38:00 -070029
Simon Glass43b41562017-04-16 21:01:11 -060030config 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
Simon Glass41fa0352016-01-30 16:38:00 -070038config PWM_TEGRA
39 bool "Enable support for the Tegra PWM"
Simon Glass91c08af2016-01-30 16:38:01 -070040 depends on DM_PWM
Simon Glass41fa0352016-01-30 16:38:00 -070041 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.