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 PWM found on AT91 SoC's"
14 depends on DM_PWM && ARCH_AT91
16 Support for PWM hardware on AT91 based SoC.
19 bool "Enable support for the Chrome OS EC PWM"
22 This PWM is found on several Chrome OS devices and controlled by
23 the Chrome OS embedded controller. It may be used to control the
24 screen brightness and/or the keyboard backlight depending on the
28 bool "Enable support for the Exynos PWM"
31 This PWM is found on Samsung Exynos 5250 and other Samsung SoCs. It
32 supports a programmable period and duty cycle. A 32-bit counter is
33 used. It provides 5 channels which can be independently
34 programmed. Channel 4 (the last) is normally used as a timer.
37 bool "Enable support for i.MX27 and later PWM"
39 This PWM is found i.MX27 and later i.MX SoCs.
42 bool "Enable support for Amlogic Meson SoCs PWM"
45 This PWM is found on Amlogic Meson SoCs. It supports a
46 programmable period and duty cycle for 2 independant channels.
49 bool "Enable support for MediaTek PWM"
52 This PWM is found on MT7622, MT7623, and MT7629. It supports a
53 programmable period and duty cycle.
56 bool "Enable support for the Rockchip PWM"
59 This PWM is found on RK3288 and other Rockchip SoCs. It supports a
60 programmable period and duty cycle. A 32-bit counter is used.
61 Various options provided in the hardware (such as capture mode and
62 continuous/single-shot) are not supported by the driver.
65 bool "Enable support for the sandbox PWM"
67 This is a sandbox PWM used for testing. It provides 3 channels and
68 records the settings passed into it, but otherwise does nothing
69 useful. The PWM can be enabled but is not connected to any outputs
70 so this is not very useful.
73 bool "Enable support for SiFive PWM"
76 This PWM is found SiFive's FU540 and other SoCs.
79 bool "Enable support for the Tegra PWM"
82 This PWM is found on Tegra 20 and other Nvidia SoCs. It supports
83 four channels with a programmable period and duty cycle. Only a
84 32KHz clock is supported by the driver but the duty cycle is
88 bool "Enable support for the Allwinner Sunxi PWM"
91 This PWM is found on H3, A64 and other Allwinner SoCs. It supports a
92 programmable period and duty cycle. A 16-bit counter is used.
95 bool "Enable support for EHRPWM PWM"
96 depends on DM_PWM && ARCH_OMAP2PLUS
99 PWM driver support for the EHRPWM controller found on TI SOCs.