[PATCH RESEND v4 0/4] Initial support for ImgTec PWM DAC and PDM DAC

[naidu.tellapati@gmail.com]

From: Naidu Tellapati <Naidu.Tellapati@imgtec.com>

The Pistachio SOC from Imagination Technologies includes – 4x PDM blocks
and 1x “basic PWM” block with four output channels. These share 4 MFIO pins,
each PWM channel being muxed with each PDM block output (0-3 muxed with 0-3)
using the CR_PERIP_PWM_PDM_CONTROL register in the peripheral wrapper
register bank (offset 0x140). The PDM and PWM outputs are used to control
targets such as LCD backlight.

The PWM driver uses Linux PWM framework. Since the PDM does not fit into PWM
framework we have implemented it as a MISC driver.

The series is based on v3.18-rc5.

I am re-sending the series with gmail SMTP as we had some problems with
the mail server we used in the previous rounds.

Please review and provide your comments.

Changes from v3:

 * Addressed couple of comments given in v3.

Changes from v2:

 * Added depends on MIPS || COMPILE_TEST.

 * Corrected the logic while calculating time base steps.

 * Addressed few other minor comments given in v2.

Changes from v1:

 * Used regmap_update_bits at some places in the driver.

 * Placed some #defines next to their register.

 * Added depends on HAS_IOMEM in Kconfig.

 * Removed unnecessary paragraph from file header.

 * Defined register masks in a readable way.

 * Renamed clk-names with clock-names.

 * Added system interface clock in DT binding document.

 * Addressed few other minor review comments given in v1.

Naidu Tellapati (4):
  pwm: Imagination Technologies PWM DAC driver
  DT: pwm: Add binding document for IMG PWM DAC
  pdm: Imagination Technologies PDM DAC driver
  DT: pdm: Add binding document for IMG PDM DAC

 Documentation/devicetree/bindings/misc/img-pdm.txt |   54 ++
 Documentation/devicetree/bindings/pwm/img-pwm.txt  |   23 +
 drivers/misc/Kconfig                               |   12 +
 drivers/misc/Makefile                              |    1 +
 drivers/misc/img-pdm.c                             |  676 ++++++++++++++++++++
 drivers/pwm/Kconfig                                |   12 +
 drivers/pwm/Makefile                               |    1 +
 drivers/pwm/pwm-img.c                              |  270 ++++++++
 include/linux/img_pdm.h                            |   35 +
 9 files changed, 1084 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/misc/img-pdm.txt
 create mode 100644 Documentation/devicetree/bindings/pwm/img-pwm.txt
 create mode 100644 drivers/misc/img-pdm.c
 create mode 100644 drivers/pwm/pwm-img.c
 create mode 100644 include/linux/img_pdm.h