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u-boot
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drivers
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pwm
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Kconfig

Kconfig 2.2 KB
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  1. config DM_PWM
    2. 

  2. 	bool "Enable support for pulse-width modulation devices (PWM)"
    3. 

  3. 	depends on DM
    4. 

  4. 	help
    5. 

  5. 	  A pulse-width modulator emits a pulse of varying width and provides
    6. 

  6. 	  control over the duty cycle (high and low time) of the signal. This
    7. 

  7. 	  is often used to control a voltage level. The more time the PWM
    8. 

  8. 	  spends in the 'high' state, the higher the voltage. The PWM's
    9. 

  9. 	  frequency/period can be controlled along with the proportion of that
    10. 

  10. 	  time that the signal is high.
    11. 

  11. 

  12. config PWM_EXYNOS
    13. 

  13. 	bool "Enable support for the Exynos PWM"
    14. 

  14. 	depends on DM_PWM
    15. 

  15. 	help
    16. 

  16. 	  This PWM is found on Samsung Exynos 5250 and other Samsung SoCs. It
    17. 

  17. 	  supports a programmable period and duty cycle. A 32-bit counter is
    18. 

  18. 	  used. It provides 5 channels which can be independently
    19. 

  19. 	  programmed. Channel 4 (the last) is normally used as a timer.
    20. 

  20. 

  21. config PWM_ROCKCHIP
    22. 

  22. 	bool "Enable support for the Rockchip PWM"
    23. 

  23. 	depends on DM_PWM
    24. 

  24. 	help
    25. 

  25. 	  This PWM is found on RK3288 and other Rockchip SoCs. It supports a
    26. 

  26. 	  programmable period and duty cycle. A 32-bit counter is used.
    27. 

  27. 	  Various options provided in the hardware (such as capture mode and
    28. 

  28. 	  continuous/single-shot) are not supported by the driver.
    29. 

  29. 

  30. config PWM_SANDBOX
    31. 

  31. 	bool "Enable support for the sandbox PWM"
    32. 

  32. 	help
    33. 

  33. 	  This is a sandbox PWM used for testing. It provides 3 channels and
    34. 

  34. 	  records the settings passed into it, but otherwise does nothing
    35. 

  35. 	  useful. The PWM can be enabled but is not connected to any outputs
    36. 

  36. 	  so this is not very useful.
    37. 

  37. 

  38. config PWM_TEGRA
    39. 

  39. 	bool "Enable support for the Tegra PWM"
    40. 

  40. 	depends on DM_PWM
    41. 

  41. 	help
    42. 

  42. 	  This PWM is found on Tegra 20 and other Nvidia SoCs. It supports
    43. 

  43. 	  four channels with a programmable period and duty cycle. Only a
    44. 

  44. 	  32KHz clock is supported by the driver but the duty cycle is
    45. 

  45. 	  configurable.
    46. 

  46. 

  47. config PWM_SUNXI
    48. 

  48. 	bool "Enable support for the Allwinner Sunxi PWM"
    49. 

  49. 	depends on DM_PWM
    50. 

  50. 	help
    51. 

  51. 	  This PWM is found on H3, A64 and other Allwinner SoCs. It supports a
    52. 

  52. 	  programmable period and duty cycle. A 16-bit counter is used.
    53. 

  53. 

  54. config PWM_ARK
    55. 

  55. 	bool "Enable support for the Arkmicro PWM"
    56. 

  56. 	help
    57. 

  57. 	  This PWM is found on Arkmicro SoCs. It supports a
    58. 

  58. 	  programmable period and duty cycle. A 32-bit counter is used.
    59.