clk: add clk_ignore_unused option to keep boot clocks on

statically initialized clock data MUST be defined in a separate file

from the logic that implements its ops.  Basically separate the logic

from the data and all is well.

	Part 6 - Disabling clock gating of unused clocks

Sometimes during development it can be useful to be able to bypass the

default disabling of unused clocks. For example, if drivers aren't enabling

clocks properly but rely on them being on from the bootloader, bypassing

the disabling means that the driver will remain functional while the issues

are sorted out.

To bypass this disabling, include "clk_ignore_unused" in the bootargs to the

kernel.

	AVR32	AVR32 architecture is enabled.

	AX25	Appropriate AX.25 support is enabled.

	BLACKFIN Blackfin architecture is enabled.

	CLK	Common clock infrastructure is enabled.

	DRM	Direct Rendering Management support is enabled.

	DYNAMIC_DEBUG Build in debug messages and enable them at runtime

	EDD	BIOS Enhanced Disk Drive Services (EDD) is enabled

	cio_ignore=	[S390]

			See Documentation/s390/CommonIO for details.

	clk_ignore_unused

			[CLK]

			Keep all clocks already enabled by bootloader on,

			even if no driver has claimed them. This is useful

			for debug and development, but should not be

			needed on a platform with proper driver support.

			For more information, see Documentation/clk.txt.

	clock=		[BUGS=X86-32, HW] gettimeofday clocksource override.

			[Deprecated]

	return;

}

static bool clk_ignore_unused;

static int __init clk_ignore_unused_setup(char *__unused)

{

	clk_ignore_unused = true;

	return 1;

}

__setup("clk_ignore_unused", clk_ignore_unused_setup);

static int clk_disable_unused(void)

{

	struct clk *clk;

	if (clk_ignore_unused) {

		pr_warn("clk: Not disabling unused clocks\n");

		return 0;

	}

	clk_prepare_lock();

	hlist_for_each_entry(clk, &clk_root_list, child_node)