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 Aspeed PWM"
16 This PWM is found on Ast2600 SoCs. It supports a programmable period
17 and duty cycle. It provides 16 channels which can be independently
21 bool "Enable support for PWM found on AT91 SoC's"
22 depends on DM_PWM && ARCH_AT91
24 Support for PWM hardware on AT91 based SoC.
26 config PWM_CADENCE_TTC
27 bool "Enable support for the Cadence TTC PWM"
28 depends on DM_PWM && !CADENCE_TTC_TIMER
30 Cadence TTC can be configured as timer which is done via
31 CONFIG_CADENCE_TTC_TIMER or as PWM. This is covering only PWM now.
34 bool "Enable support for the Chrome OS EC PWM"
37 This PWM is found on several Chrome OS devices and controlled by
38 the Chrome OS embedded controller. It may be used to control the
39 screen brightness and/or the keyboard backlight depending on the
43 bool "Enable support for the Exynos PWM"
46 This PWM is found on Samsung Exynos 5250 and other Samsung SoCs. It
47 supports a programmable period and duty cycle. A 32-bit counter is
48 used. It provides 5 channels which can be independently
49 programmed. Channel 4 (the last) is normally used as a timer.
52 bool "Enable support for i.MX27 and later PWM"
54 This PWM is found i.MX27 and later i.MX SoCs.
57 bool "Enable support for Amlogic Meson SoCs PWM"
60 This PWM is found on Amlogic Meson SoCs. It supports a
61 programmable period and duty cycle for 2 independant channels.
64 bool "Enable support for MediaTek PWM"
67 This PWM is found on MT7622, MT7623, and MT7629. It supports a
68 programmable period and duty cycle.
71 bool "Enable support for the Rockchip PWM"
74 This PWM is found on RK3288 and other Rockchip SoCs. It supports a
75 programmable period and duty cycle. A 32-bit counter is used.
76 Various options provided in the hardware (such as capture mode and
77 continuous/single-shot) are not supported by the driver.
80 bool "Enable support for the sandbox PWM"
82 This is a sandbox PWM used for testing. It provides 3 channels and
83 records the settings passed into it, but otherwise does nothing
84 useful. The PWM can be enabled but is not connected to any outputs
85 so this is not very useful.
88 bool "Enable support for SiFive PWM"
91 This PWM is found SiFive's FU540 and other SoCs.
94 bool "Enable support for the Tegra PWM"
97 This PWM is found on Tegra 20 and other Nvidia SoCs. It supports
98 four channels with a programmable period and duty cycle. Only a
99 32KHz clock is supported by the driver but the duty cycle is
103 bool "Enable support for the Allwinner Sunxi PWM"
106 This PWM is found on H3, A64 and other Allwinner SoCs. It supports a
107 programmable period and duty cycle. A 16-bit counter is used.
110 bool "Enable support for EHRPWM PWM"
111 depends on DM_PWM && ARCH_OMAP2PLUS
114 PWM driver support for the EHRPWM controller found on TI SOCs.