diff options
Diffstat (limited to 'drivers/pwm/Kconfig')
-rw-r--r-- | drivers/pwm/Kconfig | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 8fc3808d7a3e..90c5c7357a50 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig | |||
@@ -1,12 +1,31 @@ | |||
1 | menuconfig PWM | 1 | menuconfig PWM |
2 | bool "PWM Support" | 2 | bool "Pulse-Width Modulation (PWM) Support" |
3 | depends on !MACH_JZ4740 && !PUV3_PWM | 3 | depends on !MACH_JZ4740 && !PUV3_PWM |
4 | help | 4 | help |
5 | This enables PWM support through the generic PWM framework. | 5 | Generic Pulse-Width Modulation (PWM) support. |
6 | You only need to enable this, if you also want to enable | 6 | |
7 | one or more of the PWM drivers below. | 7 | In Pulse-Width Modulation, a variation of the width of pulses |
8 | 8 | in a rectangular pulse signal is used as a means to alter the | |
9 | If unsure, say N. | 9 | average power of the signal. Applications include efficient |
10 | power delivery and voltage regulation. In computer systems, | ||
11 | PWMs are commonly used to control fans or the brightness of | ||
12 | display backlights. | ||
13 | |||
14 | This framework provides a generic interface to PWM devices | ||
15 | within the Linux kernel. On the driver side it provides an API | ||
16 | to register and unregister a PWM chip, an abstraction of a PWM | ||
17 | controller, that supports one or more PWM devices. Client | ||
18 | drivers can request PWM devices and use the generic framework | ||
19 | to configure as well as enable and disable them. | ||
20 | |||
21 | This generic framework replaces the legacy PWM framework which | ||
22 | allows only a single driver implementing the required API. Not | ||
23 | all legacy implementations have been ported to the framework | ||
24 | yet. The framework provides an API that is backward compatible | ||
25 | with the legacy framework so that existing client drivers | ||
26 | continue to work as expected. | ||
27 | |||
28 | If unsure, say no. | ||
10 | 29 | ||
11 | if PWM | 30 | if PWM |
12 | 31 | ||