> -----Original Message----- > From: Hiremath, Vaibhav > Sent: Monday, March 04, 2013 5:06 PM > To: linux-omap@xxxxxxxxxxxxxxx > Cc: tony@xxxxxxxxxxx; khilman@xxxxxxxxxx; paul@xxxxxxxxx; Nayak, > Rajendra; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; Hiremath, Vaibhav > Subject: [RFC PATCH 0/3] ARM: OMAP2+: Add command line parameter for > debugSS module control > > From: Vaibhav Hiremath <hvaibhav@xxxxxx> > > Currently there is no clean mechanism to control debugSS module and > you have to always keep clocks enabled, either, > > - By enabling it during boot as part of clk_init function > (post common-clock migration). > Or > - By having HWMOD_INIT_NO_IDLE flag in hwmod data > (Joel submitted patch for AM335x earlier). > > Based on the discussion with Kevin H, > http://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg81771.html > > This patch introduces new kernel parameter "omap_debugss_en", > which will allow user to control debugSS module enable/disable > part during boot-time. > > In case of OMAP3, the debugSS is part of EMU domain and > is currently controlled by clock tree alone. > > In case of OMAP4, the debugSS is part of EMU domain and > is currently controlled by clock tree, as MODULEMODE_SWCTRL > is not defined for hwmod. > > In case of AM335x, the debugSS is in wakeup domain and is currently > controlled through hwmod alone. Currently we keep it always enabled. > > Testing: > - Tested on AM335x based EVM and BeagleBone platform > > As required, without this flag the debugSS module will be > disabled > during kernel boot. > > OMAP (2/3/4) may require some changes from clock/hwmod perspective > in order to use this new parameter. > I am still looking into OMAP spec and this RFC version of patch-series > is to get comments or opinion from list. > > Vaibhav Hiremath (3): > ARM: AM33XX: clock: Add debugSS clock nodes to clock tree > ARM: AM33XX: hwmod: Add hwmod data for debugSS > ARM: OMAP2+: Add command line parameter for debugSS module control > > Documentation/kernel-parameters.txt | 3 + > arch/arm/mach-omap2/Makefile | 2 +- > arch/arm/mach-omap2/cclock33xx_data.c | 47 +++++++++++++++-- > arch/arm/mach-omap2/debugss.c | 80 > ++++++++++++++++++++++++++++ > arch/arm/mach-omap2/omap_hwmod_33xx_data.c | 69 ++++++++++++++++---- > ---- > 5 files changed, 173 insertions(+), 28 deletions(-) > create mode 100644 arch/arm/mach-omap2/debugss.c Kevin/Tony, Any comments or input on this patch series? Thanks, Vaibhav -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
