Commit 2bbbf827 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

docs: memory-devices: convert ti-emif.txt to ReST 



Prepare this file to be moved to a kernel book by converting
it to ReST format and renaming it to ti-emif.rst.

While this is not part of any book, mark it as :orphan:, in order
to avoid build warnings.

Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent dc7a12bd

Documentation/memory-devices/ti-emif.txt→Documentation/memory-devices/ti-emif.rst

+17 −10
Original line number Diff line number Diff line 
TI EMIF SDRAM Controller Driver:

:orphan:



===============================

TI EMIF SDRAM Controller Driver

===============================



Author

========

======

Aneesh V <aneesh@ti.com>



Location

============

========

driver/memory/emif.c



Supported SoCs:

===================

===============

TI OMAP44xx

TI OMAP54xx



Menuconfig option:

==========================

==================

Device Drivers

	Memory devices

		Texas Instruments EMIF driver
@@ -29,10 +33,11 @@ functions of the driver includes re-configuring AC timing 
parameters and other settings during frequency, voltage and

temperature changes



Platform Data (see include/linux/platform_data/emif_plat.h):

=====================================================================

Platform Data (see include/linux/platform_data/emif_plat.h)

===========================================================

DDR device details and other board dependent and SoC dependent

information can be passed through platform data (struct emif_platform_data)



- DDR device details: 'struct ddr_device_info'

- Device AC timings: 'struct lpddr2_timings' and 'struct lpddr2_min_tck'

- Custom configurations: customizable policy options through
@@ -40,17 +45,19 @@ information can be passed through platform data (struct emif_platform_data) 
- IP revision

- PHY type



Interface to the external world:

================================

Interface to the external world

===============================

EMIF driver registers notifiers for voltage and frequency changes

affecting EMIF and takes appropriate actions when these are invoked.



- freq_pre_notify_handling()

- freq_post_notify_handling()

- volt_notify_handling()



Debugfs

========

=======

The driver creates two debugfs entries per device.



- regcache_dump : dump of register values calculated and saved for all

  frequencies used so far.

- mr4 : last polled value of MR4 register in the LPDDR2 device. MR4

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