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authorBrian Norris <briannorris@chromium.org>2016-07-16 02:28:44 +0300
committerThierry Reding <thierry.reding@gmail.com>2016-07-25 11:40:41 +0300
commit1f0d3bb02785f698dc273b9006a473194c32f874 (patch)
treec4557cae6930d36e9e834d1cc39770672d7c0062 /drivers/pwm/Kconfig
parent9e60f50b4a79ae2df791d89d08cf2b78ad7629bd (diff)
downloadlinux-1f0d3bb02785f698dc273b9006a473194c32f874.tar.xz
pwm: Add ChromeOS EC PWM driver
Use the new ChromeOS EC EC_CMD_PWM_{GET,SET}_DUTY commands to control one or more PWMs attached to the Embedded Controller. Because the EC allows us to modify the duty cycle (as a percentage, where U16_MAX is 100%) but not the period, we assign the period a fixed value of EC_PWM_MAX_DUTY and reject all attempts to change it. This driver supports only device tree at the moment, because that provides a very flexible way of describing the relationship between PWMs and their consumer devices (e.g., backlight). On a non-DT system, we'll probably want to use the non-GENERIC addressing (i.e., we'll need to make special device instances that will use EC_PWM_TYPE_KB_LIGHT or EC_PWM_TYPE_DISPLAY_LIGHT), as well as the relatively inflexible pwm_lookup infrastructure for matching devices. Defer that work for now. Signed-off-by: Brian Norris <briannorris@chromium.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/Kconfig')
-rw-r--r--drivers/pwm/Kconfig7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index db32cb8c1aba..80a566a00d04 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -147,6 +147,13 @@ config PWM_CRC
Generic PWM framework driver for Crystalcove (CRC) PMIC based PWM
control.
+config PWM_CROS_EC
+ tristate "ChromeOS EC PWM driver"
+ depends on MFD_CROS_EC
+ help
+ PWM driver for exposing a PWM attached to the ChromeOS Embedded
+ Controller.
+
config PWM_EP93XX
tristate "Cirrus Logic EP93xx PWM support"
depends on ARCH_EP93XX