AVR32 PWM driver and example user

Two patches from David Brownell follow. The first one implements a
low-level driver/library for the PWM controller integrated on some
newer AVR32- and ARM-based chips from Atmel. The second one uses this
library to implement a LED driver with variable brightness.

There's currently no user of this LED driver, but it can be tested on
the ATSTK1000 by following the instructions here:

http://avr32linux.org/twiki/bin/view/Main/AtmelPwmDriver

Also, PWM functionality in the kernel has been requested by several
AVR32 users with custom boards (which we hopefully will see support
for in mainline later), and some AT91-based boards may be able to use
the PWM LED driver by default given some suitable platform- and board
code (David mentioned AT91SAM9263EK.) I'd appreciate some feedback
from AT91 people about this.

David Brownell (2):
      Basic PWM driver for AVR32 and AT91
      PWM LED driver

 arch/avr32/mach-at32ap/at32ap700x.c   |   54 +++++
 drivers/leds/Kconfig                  |    7 +
 drivers/leds/Makefile                 |    1 +
 drivers/leds/leds-atmel-pwm.c         |  157 +++++++++++++
 drivers/misc/Kconfig                  |    9 +
 drivers/misc/Makefile                 |    1 +
 drivers/misc/atmel_pwm.c              |  409 +++++++++++++++++++++++++++++++++
 include/asm-avr32/arch-at32ap/board.h |    3 +
 include/linux/atmel_pwm.h             |   70 ++++++
 9 files changed, 711 insertions(+), 0 deletions(-)
 create mode 100644 drivers/leds/leds-atmel-pwm.c
 create mode 100644 drivers/misc/atmel_pwm.c
 create mode 100644 include/linux/atmel_pwm.h