linux/Documentation/memory-devices/ti-emif.txt
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   1TI EMIF SDRAM Controller Driver:
   2
   3Author
   4========
   5Aneesh V <aneesh@ti.com>
   6
   7Location
   8============
   9driver/memory/emif.c
  10
  11Supported SoCs:
  12===================
  13TI OMAP44xx
  14TI OMAP54xx
  15
  16Menuconfig option:
  17==========================
  18Device Drivers
  19        Memory devices
  20                Texas Instruments EMIF driver
  21
  22Description
  23===========
  24This driver is for the EMIF module available in Texas Instruments
  25SoCs. EMIF is an SDRAM controller that, based on its revision,
  26supports one or more of DDR2, DDR3, and LPDDR2 SDRAM protocols.
  27This driver takes care of only LPDDR2 memories presently. The
  28functions of the driver includes re-configuring AC timing
  29parameters and other settings during frequency, voltage and
  30temperature changes
  31
  32Platform Data (see include/linux/platform_data/emif_plat.h):
  33=====================================================================
  34DDR device details and other board dependent and SoC dependent
  35information can be passed through platform data (struct emif_platform_data)
  36- DDR device details: 'struct ddr_device_info'
  37- Device AC timings: 'struct lpddr2_timings' and 'struct lpddr2_min_tck'
  38- Custom configurations: customizable policy options through
  39  'struct emif_custom_configs'
  40- IP revision
  41- PHY type
  42
  43Interface to the external world:
  44================================
  45EMIF driver registers notifiers for voltage and frequency changes
  46affecting EMIF and takes appropriate actions when these are invoked.
  47- freq_pre_notify_handling()
  48- freq_post_notify_handling()
  49- volt_notify_handling()
  50
  51Debugfs
  52========
  53The driver creates two debugfs entries per device.
  54- regcache_dump : dump of register values calculated and saved for all
  55  frequencies used so far.
  56- mr4 : last polled value of MR4 register in the LPDDR2 device. MR4
  57  indicates the current temperature level of the device.
  58
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