OMAP2+: hwmod/clockevent: allow late-init of individual hwmods

Salut Beno?t,

Quoted 17 lines · Benoit

Quoted 8 lines · Paul Walmsley

This series adds the ability to late-initialize individual hwmods. The goal here is for clockevent (and eventually clocksource) hwmods to be late-initialized individually, and right before they are needed, in the timer init code. Then omap_hwmod_late_init(), which late-inits the rest of the hwmods, is intended to run as an initcall -- much later in the boot process.

Quoted 5 lines

This series includes the OMAP2/3 hwmod data for the GPTIMERs that Tarun posted earlier. This data is necessary for this new code to avoid warnings during boot.

Boot-tested on N800, OMAP34xx Beagleboard and OMAP4430ES2 Panda.

I'm testing it on 4430sdp, and I have the following warning:

Quoted 13 lines

[    0.000000] omap_hwmod: dpll_mpu_m2_ck: missing clockdomain for dpll_mpu_m2_ck.
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: at arch/arm/mach-omap2/timer-gp.c:157 omap2_gp_timer_init+0x80/0x190()
[    0.000000] timer-gp: omap_dm_timer_set_source() failed
[    0.000000] Modules linked in:
[    0.000000] [<c0062a6c>] (unwind_backtrace+0x0/0xec) from [<c009422c>] (warn_slowpath_common+0x4c/0x64)
[    0.000000] [<c009422c>] (warn_slowpath_common+0x4c/0x64) from [<c00942c4>] (warn_slowpath_fmt+0x2c/0x3c)
[    0.000000] [<c00942c4>] (warn_slowpath_fmt+0x2c/0x3c) from [<c0010e30>] (omap2_gp_timer_init+0x80/0x190)
[    0.000000] [<c0010e30>] (omap2_gp_timer_init+0x80/0x190) from [<c000c0dc>] (time_init+0x20/0x30)
[    0.000000] [<c000c0dc>] (time_init+0x20/0x30) from [<c0008cbc>] (start_kernel+0x1a4/0x30c)
[    0.000000] [<c0008cbc>] (start_kernel+0x1a4/0x30c) from [<80008038>] (0x80008038)
[    0.000000] ---[ end trace 1b75b31a2719ed1c ]---
[    0.000000] OMAP clockevent source: GPTIMER1 at 32768 Hz

This is due to commit 3b03b58dab847883e6b9a431558c7d8e43fa94c6 ("OMAP4:
hwmod data: Prevent timer1 to be reset and idle during init"). Could you please try reverting this and see if the warning disappears?

Tony, I guess the omap-for-linus branch will probably need to get rebuilt to drop that patch, once this series is merged...

- Paul