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| author | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-06-18 20:03:13 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-07-15 16:03:03 +0200 |
| commit | 652a49bc68ce3cf0355bde357b3998bd63e73915 (patch) | |
| tree | 91811a9ba5e5ffc9e0d55cf5789bd6fee3d56edc /Documentation/memory-devices | |
| parent | docs: phy: place documentation under driver-api (diff) | |
| download | linux-652a49bc68ce3cf0355bde357b3998bd63e73915.tar.xz linux-652a49bc68ce3cf0355bde357b3998bd63e73915.zip | |
docs: add a memory-devices subdir to driver-api
There are two docs describing memory device drivers.
Add both to this new chapter of the driver-api.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'Documentation/memory-devices')
| -rw-r--r-- | Documentation/memory-devices/ti-emif.rst | 64 |
1 files changed, 0 insertions, 64 deletions
diff --git a/Documentation/memory-devices/ti-emif.rst b/Documentation/memory-devices/ti-emif.rst deleted file mode 100644 index c9242294e63c..000000000000 --- a/Documentation/memory-devices/ti-emif.rst +++ /dev/null @@ -1,64 +0,0 @@ -: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 - -Description -=========== -This driver is for the EMIF module available in Texas Instruments -SoCs. EMIF is an SDRAM controller that, based on its revision, -supports one or more of DDR2, DDR3, and LPDDR2 SDRAM protocols. -This driver takes care of only LPDDR2 memories presently. The -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) -=========================================================== -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 - 'struct emif_custom_configs' -- IP revision -- PHY type - -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 - indicates the current temperature level of the device. |