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authorSekhar Nori <nsekhar@ti.com>2009-12-17 15:59:31 +0300
committerKevin Hilman <khilman@deeprootsystems.com>2010-02-05 00:29:55 +0300
commitefc1bb8a6fd56f6df5b797dff5156c935175c319 (patch)
tree47b79c7f2d585ae73650acbf9d11058fb00ecb52 /arch/mips/nxp
parent7307d093e6f05d845fc5ce47893c391c819a5c2b (diff)
downloadlinux-efc1bb8a6fd56f6df5b797dff5156c935175c319.tar.xz
davinci: add power management support
This patch adds core power management (suspend-to-RAM) support for DaVinci SoCs. The code depends on the the "deepsleep" feature to suspend the SoC and saves power by gating the input clock. The wakeup can be based on an external event as supported by the SoC. Assembly code (in sleep.S) is added to aid gating DDR2 clocks. Code doing this work should not be accessing DDR2. The assembly code is relocated to SRAM by the code in pm.c The support has been validated on DA850/OMAP-L138 only though the code is (hopefully) generic enough that other SoCs supporting deepsleep feature simply requires SoC specific code to start using this driver. Note that all the device drivers don't support suspend/resume still and are being worked on. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
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