2 bool "Enable support for pulse-width modulation devices (PWM)"
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.
13 bool "Enable support for the Exynos PWM"
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.
22 bool "Enable support for the Rockchip PWM"
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.
31 bool "Enable support for the sandbox PWM"
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.
39 bool "Enable support for the Tegra PWM"
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
48 bool "Enable support for the Allwinner Sunxi PWM"
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.