Current OMAP code supports couple of clocksource options based on compilation flag (CONFIG_OMAP_32K_TIMER). The 32KHz sync-timer and a gptimer which can run on 32KHz or system clock (e.g 38.4 MHz) This patch series cleans up the existing 32k-sync timer implementation without any major code changes, uses kernel parameter to override the default clocksource of "counter_32k", also in order to support some OMAP based derivative SoCs like AM33XX which doesn't have 32K sync-timer hardware IP, adds hwmod lookup for omap2+ devices, and if lookup fails then fall back to gp-timer. if(use_gptimer_clksrc == true) gptimer clocksource init; else if (counter_32 init == false) /* Fallback to gptimer */ gptimer clocksource init(; With this, we should be able to support multi-omap boot including devices with/without 32k-sync timer. This patch-series has been boot tested on AM37xEVM platform, it would be helpful if somebody help me to validate it on OMAP1/2 platforms. The patches are also available at (based on linux-omap/master) - https://github.com/hvaibhav/am335x-linux 32ksync-timer-cleanup History: ======== Changes from V4 (No Code Change at all): http://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg67019.html - Updated commit description as per Tony's comment Changes from V3: http://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg66462.html - Fixed all review comments from Kevin H * Moved counter_32k CR register offset handling to counter_32k.c file, so now, calling funtion don't have to maintain or add offset to base addr. * Added comment for function omap_init_clocksource_32k() * Used resource_size() for calculate size * Convert WARN_ON to pr_warn Changes from V2: http://lists.infradead.org/pipermail/linux-arm-kernel/2012-March/092037.html - Added early_param support to read clocksource selection from user through kernel parameter ("clocksource=") - Converted to ocp_if changes from Paul Changes from V1: http://lists.infradead.org/pipermail/linux-arm-kernel/2012-January/081037.html - Based on Tony's comment, added pbase & size argument to omap_init_clocksource_32k(), to avoid cpu_is_xxx() check. - Added commit description based on discussion on list (Thanks to Santosh here) - Reorder patch sequence Vaibhav Hiremath (3): ARM: OMAP2/3: Add idle_st bits for ST_32KSYNC timer to prcm-common header ARM: OMAP2/3: hwmod data: Add 32k-sync timer data to hwmod database ARM: OMAP: Make OMAP clocksource source selection using kernel param arch/arm/mach-omap1/timer32k.c | 6 +- arch/arm/mach-omap2/omap_hwmod_2420_data.c | 19 ++++ arch/arm/mach-omap2/omap_hwmod_2430_data.c | 19 ++++ arch/arm/mach-omap2/omap_hwmod_2xxx_ipblock_data.c | 19 ++++ arch/arm/mach-omap2/omap_hwmod_3xxx_data.c | 54 ++++++++++ arch/arm/mach-omap2/omap_hwmod_common_data.h | 1 + arch/arm/mach-omap2/prcm-common.h | 4 + arch/arm/mach-omap2/timer.c | 99 ++++++++++++++---- arch/arm/plat-omap/counter_32k.c | 108 ++++++++++---------- arch/arm/plat-omap/include/plat/common.h | 2 +- 10 files changed, 254 insertions(+), 77 deletions(-) -- 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
