1config 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. 11 12config PWM_CROS_EC 13 bool "Enable support for the Chrome OS EC PWM" 14 depends on DM_PWM 15 help 16 This PWM is found on several Chrome OS devices and controlled by 17 the Chrome OS embedded controller. It may be used to control the 18 screen brightness and/or the keyboard backlight depending on the 19 device. 20 21config PWM_EXYNOS 22 bool "Enable support for the Exynos PWM" 23 depends on DM_PWM 24 help 25 This PWM is found on Samsung Exynos 5250 and other Samsung SoCs. It 26 supports a programmable period and duty cycle. A 32-bit counter is 27 used. It provides 5 channels which can be independently 28 programmed. Channel 4 (the last) is normally used as a timer. 29 30config PWM_IMX 31 bool "Enable support for i.MX27 and later PWM" 32 help 33 This PWM is found i.MX27 and later i.MX SoCs. 34 35config PWM_MESON 36 bool "Enable support for Amlogic Meson SoCs PWM" 37 depends on DM_PWM 38 help 39 This PWM is found on Amlogic Meson SoCs. It supports a 40 programmable period and duty cycle for 2 independant channels. 41 42config PWM_MTK 43 bool "Enable support for MediaTek PWM" 44 depends on DM_PWM 45 help 46 This PWM is found on MT7622, MT7623, and MT7629. It supports a 47 programmable period and duty cycle. 48 49config PWM_ROCKCHIP 50 bool "Enable support for the Rockchip PWM" 51 depends on DM_PWM 52 help 53 This PWM is found on RK3288 and other Rockchip SoCs. It supports a 54 programmable period and duty cycle. A 32-bit counter is used. 55 Various options provided in the hardware (such as capture mode and 56 continuous/single-shot) are not supported by the driver. 57 58config PWM_SANDBOX 59 bool "Enable support for the sandbox PWM" 60 help 61 This is a sandbox PWM used for testing. It provides 3 channels and 62 records the settings passed into it, but otherwise does nothing 63 useful. The PWM can be enabled but is not connected to any outputs 64 so this is not very useful. 65 66config PWM_SIFIVE 67 bool "Enable support for SiFive PWM" 68 depends on DM_PWM 69 help 70 This PWM is found SiFive's FU540 and other SoCs. 71 72config PWM_TEGRA 73 bool "Enable support for the Tegra PWM" 74 depends on DM_PWM 75 help 76 This PWM is found on Tegra 20 and other Nvidia SoCs. It supports 77 four channels with a programmable period and duty cycle. Only a 78 32KHz clock is supported by the driver but the duty cycle is 79 configurable. 80 81config PWM_SUNXI 82 bool "Enable support for the Allwinner Sunxi PWM" 83 depends on DM_PWM 84 help 85 This PWM is found on H3, A64 and other Allwinner SoCs. It supports a 86 programmable period and duty cycle. A 16-bit counter is used. 87 88config PWM_TI_EHRPWM 89 bool "Enable support for EHRPWM PWM" 90 depends on DM_PWM && ARCH_OMAP2PLUS 91 default y 92 help 93 PWM driver support for the EHRPWM controller found on TI SOCs. 94