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ARM: OMAP2+: hwmod: add parent_hwmod support

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Add parent_hwmod pointer to omap_hwmod. This can be set to point to a
"parent" hwmod that needs to be enabled for the "child" hwmod to work.

This is used at hwmod setup time: when doing the initial setup and
reset, first enable the parent hwmod, and after setup and reset is done,
restore the parent hwmod to postsetup_state.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Archit Taneja <archit.taneja@gmail.com>
[paul@pwsan.com: add kerneldoc documentation for parent_hwmod; note that it
 is a temporary workaround]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Tomi Valkeinen
2014-10-09 17:03:14 +03:00
committed by Paul Walmsley
parent 79005fbd3e
commit f22d254551
2 changed files with 30 additions and 0 deletions
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22
arch/arm/mach-omap2/omap_hwmod.c
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@@ -2719,11 +2719,33 @@ static int __init _setup(struct omap_hwmod *oh, void *data)
if (oh->_state != _HWMOD_STATE_INITIALIZED)
return 0;
if (oh->parent_hwmod) {
int r;
r = _enable(oh->parent_hwmod);
WARN(r, "hwmod: %s: setup: failed to enable parent hwmod %s\n",
oh->name, oh->parent_hwmod->name);
}
_setup_iclk_autoidle(oh);
if (!_setup_reset(oh))
_setup_postsetup(oh);
if (oh->parent_hwmod) {
u8 postsetup_state;
postsetup_state = oh->parent_hwmod->_postsetup_state;
if (postsetup_state == _HWMOD_STATE_IDLE)
_idle(oh->parent_hwmod);
else if (postsetup_state == _HWMOD_STATE_DISABLED)
_shutdown(oh->parent_hwmod);
else if (postsetup_state != _HWMOD_STATE_ENABLED)
WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
oh->parent_hwmod->name, postsetup_state);
}
return 0;
}