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_ASPEED 13 bool "Enable support for the Aspeed PWM" 14 depends on DM_PWM 15 select SYSCON 16 help 17 This PWM is found on Ast2600 SoCs. It supports a programmable period 18 and duty cycle. It provides 16 channels which can be independently 19 programmed. 20 21config PWM_AT91 22 bool "Enable support for PWM found on AT91 SoC's" 23 depends on DM_PWM && ARCH_AT91 24 help 25 Support for PWM hardware on AT91 based SoC. 26 27config PWM_CADENCE_TTC 28 bool "Enable support for the Cadence TTC PWM" 29 depends on DM_PWM && !CADENCE_TTC_TIMER 30 help 31 Cadence TTC can be configured as timer which is done via 32 CONFIG_CADENCE_TTC_TIMER or as PWM. This is covering only PWM now. 33 34config PWM_CROS_EC 35 bool "Enable support for the Chrome OS EC PWM" 36 depends on DM_PWM 37 help 38 This PWM is found on several Chrome OS devices and controlled by 39 the Chrome OS embedded controller. It may be used to control the 40 screen brightness and/or the keyboard backlight depending on the 41 device. 42 43config PWM_EXYNOS 44 bool "Enable support for the Exynos PWM" 45 depends on DM_PWM 46 help 47 This PWM is found on Samsung Exynos 5250 and other Samsung SoCs. It 48 supports a programmable period and duty cycle. A 32-bit counter is 49 used. It provides 5 channels which can be independently 50 programmed. Channel 4 (the last) is normally used as a timer. 51 52config PWM_IMX 53 bool "Enable support for i.MX27 and later PWM" 54 help 55 This PWM is found i.MX27 and later i.MX SoCs. 56 57config PWM_MESON 58 bool "Enable support for Amlogic Meson SoCs PWM" 59 depends on DM_PWM 60 help 61 This PWM is found on Amlogic Meson SoCs. It supports a 62 programmable period and duty cycle for 2 independant channels. 63 64config PWM_MTK 65 bool "Enable support for MediaTek PWM" 66 depends on DM_PWM 67 help 68 This PWM is found on MT7622, MT7623, and MT7629. It supports a 69 programmable period and duty cycle. 70 71config PWM_ROCKCHIP 72 bool "Enable support for the Rockchip PWM" 73 depends on DM_PWM 74 help 75 This PWM is found on RK3288 and other Rockchip SoCs. It supports a 76 programmable period and duty cycle. A 32-bit counter is used. 77 Various options provided in the hardware (such as capture mode and 78 continuous/single-shot) are not supported by the driver. 79 80config PWM_SANDBOX 81 bool "Enable support for the sandbox PWM" 82 help 83 This is a sandbox PWM used for testing. It provides 3 channels and 84 records the settings passed into it, but otherwise does nothing 85 useful. The PWM can be enabled but is not connected to any outputs 86 so this is not very useful. 87 88config PWM_S5P 89 bool "Enable non-DM support for S5P PWM" 90 depends on (S5P || ARCH_NEXELL) 91 default y 92 93config PWM_SIFIVE 94 bool "Enable support for SiFive PWM" 95 depends on DM_PWM 96 help 97 This PWM is found SiFive's FU540 and other SoCs. 98 99config PWM_TEGRA 100 bool "Enable support for the Tegra PWM" 101 depends on DM_PWM 102 help 103 This PWM is found on Tegra 20 and other Nvidia SoCs. It supports 104 four channels with a programmable period and duty cycle. Only a 105 32KHz clock is supported by the driver but the duty cycle is 106 configurable. 107 108config PWM_SUNXI 109 bool "Enable support for the Allwinner Sunxi PWM" 110 depends on DM_PWM 111 help 112 This PWM is found on H3, A64 and other Allwinner SoCs. It supports a 113 programmable period and duty cycle. A 16-bit counter is used. 114 115config PWM_TI_EHRPWM 116 bool "Enable support for EHRPWM PWM" 117 depends on DM_PWM && ARCH_OMAP2PLUS 118 default y 119 help 120 PWM driver support for the EHRPWM controller found on TI SOCs. 121