The Pistachio SOC from Imagination Technologies includes â?? 4x PDM blocks and 1x â??basic PWMâ?? 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. Changes from v5: * Used syscon for accessing PWM & PDM control register. Changes from v4: * Removed CR_prefix from the defined macros. * Folded same data type varibles in one line. * Removed cr-periph property from PWM DT binding document. * Removed regmap_update_bits from img_pwm_enable and img_pwm_disable functions. * Addressed few more comments given in v4. 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 | 24 + drivers/misc/Kconfig | 13 + drivers/misc/Makefile | 1 + drivers/misc/img-pdm.c | 672 ++++++++++++++++++++ drivers/pwm/Kconfig | 13 + drivers/pwm/Makefile | 1 + drivers/pwm/pwm-img.c | 250 ++++++++ include/linux/img_pdm.h | 35 + 9 files changed, 1063 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
