ARM: 5628/1: ep93xx: Introduce Pulse Width Modulator (PWM) driver

The EP93xx features two PWMs (one on the EP9307) with the following
features:

  * Configurable dual output
  * Separate input clocks for each PWM output
  * 16-bit resolution
  * Programmable pulse width (duty cycle), interval (frequency), and
    polarity

This adds the necessary core support as well as the driver.  A sysfs
interface is provided to control the PWM outputs.

Signed-off-by: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Ryan Mallon <ryan@bluewatersys.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 68ab39d7cb35..df1f86b5c83e 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -233,6 +233,19 @@ config ISL29003
           This driver can also be built as a module.  If so, the module
           will be called isl29003.
 
+config EP93XX_PWM
+        tristate "EP93xx PWM support"
+        depends on ARCH_EP93XX
+        help
+          This option enables device driver support for the PWM channels
+          on the Cirrus EP93xx processors.  The EP9307 chip only has one
+          PWM channel all the others have two, the second channel is an
+          alternate function of the EGPIO14 pin.  A sysfs interface is
+          provided to control the PWM channels.
+
+          To compile this driver as a module, choose M here: the module will
+          be called ep93xx_pwm.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"