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In am33xx SoC[1], enhanced capture (eCAP) supports auxiliary PWM (APWM). This series adds the PWM driver support for the APWM feature for eCAP on AM33xx. eCAP HW also supports the capture mode. Currently, this driver only supports APWM. This is based on the Linux kernel driver -> drivers/pwm/pwm-tiecap.c Version: v6.12 Tested on AM335x EVM[2]. [1] AM335x TRM - https://www.ti.com/lit/ug/spruh73q/spruh73q.pdf [2] AM335x EVM - https://www.ti.com/tool/TMDXEVM3358 Signed-off-by: Sukrut Bellary <sbellary@baylibre.com>
135 lines
4.3 KiB
Plaintext
135 lines
4.3 KiB
Plaintext
config DM_PWM
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bool "Enable support for pulse-width modulation devices (PWM)"
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depends on DM
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help
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A pulse-width modulator emits a pulse of varying width and provides
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control over the duty cycle (high and low time) of the signal. This
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is often used to control a voltage level. The more time the PWM
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spends in the 'high' state, the higher the voltage. The PWM's
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frequency/period can be controlled along with the proportion of that
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time that the signal is high.
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config PWM_ASPEED
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bool "Enable support for the Aspeed PWM"
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depends on DM_PWM
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select SYSCON
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help
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This PWM is found on Ast2600 SoCs. It supports a programmable period
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and duty cycle. It provides 16 channels which can be independently
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programmed.
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config PWM_AT91
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bool "Enable support for PWM found on AT91 SoC's"
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depends on DM_PWM && ARCH_AT91
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help
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Support for PWM hardware on AT91 based SoC.
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config PWM_CADENCE_TTC
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bool "Enable support for the Cadence TTC PWM"
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depends on DM_PWM && !CADENCE_TTC_TIMER
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help
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Cadence TTC can be configured as timer which is done via
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CONFIG_CADENCE_TTC_TIMER or as PWM. This is covering only PWM now.
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config PWM_CROS_EC
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bool "Enable support for the Chrome OS EC PWM"
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depends on DM_PWM
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help
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This PWM is found on several Chrome OS devices and controlled by
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the Chrome OS embedded controller. It may be used to control the
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screen brightness and/or the keyboard backlight depending on the
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device.
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config PWM_EXYNOS
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bool "Enable support for the Exynos PWM"
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depends on DM_PWM
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help
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This PWM is found on Samsung Exynos 5250 and other Samsung SoCs. It
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supports a programmable period and duty cycle. A 32-bit counter is
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used. It provides 5 channels which can be independently
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programmed. Channel 4 (the last) is normally used as a timer.
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config PWM_IMX
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bool "Enable support for i.MX27 and later PWM"
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help
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This PWM is found i.MX27 and later i.MX SoCs.
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config PWM_MESON
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bool "Enable support for Amlogic Meson SoCs PWM"
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depends on DM_PWM
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help
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This PWM is found on Amlogic Meson SoCs. It supports a
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programmable period and duty cycle for 2 independant channels.
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config PWM_MTK
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bool "Enable support for MediaTek PWM"
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depends on DM_PWM
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help
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This PWM is found on MT7622, MT7623, and MT7629. It supports a
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programmable period and duty cycle.
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config PWM_ROCKCHIP
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bool "Enable support for the Rockchip PWM"
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depends on DM_PWM
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help
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This PWM is found on RK3288 and other Rockchip SoCs. It supports a
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programmable period and duty cycle. A 32-bit counter is used.
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Various options provided in the hardware (such as capture mode and
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continuous/single-shot) are not supported by the driver.
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config PWM_SANDBOX
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bool "Enable support for the sandbox PWM"
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help
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This is a sandbox PWM used for testing. It provides 3 channels and
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records the settings passed into it, but otherwise does nothing
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useful. The PWM can be enabled but is not connected to any outputs
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so this is not very useful.
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config PWM_S5P
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bool "Enable non-DM support for S5P PWM"
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depends on (S5P || ARCH_NEXELL)
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default y
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config PWM_SIFIVE
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bool "Enable support for SiFive PWM"
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depends on DM_PWM
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help
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This PWM is found SiFive's FU540 and other SoCs.
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config PWM_TEGRA
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bool "Enable support for the Tegra PWM"
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depends on DM_PWM
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help
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This PWM is found on Tegra 20 and other Nvidia SoCs. It supports
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four channels with a programmable period and duty cycle. Only a
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32KHz clock is supported by the driver but the duty cycle is
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configurable.
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config PWM_STM32
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bool "Enable support for STM32 PWM"
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depends on DM_PWM && MFD_STM32_TIMERS
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help
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This enables PWM driver for STMicroelectronics STM32 pulse width
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modulation. It uses STM32 timer devices that can have up to 4 output
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channels, with complementary outputs and configurable polarity.
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config PWM_SUNXI
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bool "Enable support for the Allwinner Sunxi PWM"
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depends on DM_PWM
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help
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This PWM is found on H3, A64 and other Allwinner SoCs. It supports a
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programmable period and duty cycle. A 16-bit counter is used.
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config PWM_TI_EHRPWM
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bool "Enable support for EHRPWM PWM"
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depends on DM_PWM && ARCH_OMAP2PLUS
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default y
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help
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PWM driver support for the EHRPWM controller found on TI SOCs.
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config PWM_TI_ECAP
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bool "Enable support for ECAP PWM"
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depends on DM_PWM && ARCH_OMAP2PLUS
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help
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PWM driver support for the ECAP controller found on TI SOCs.
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