Merge branch '2023-08-31-replace-more-init-hooks-with-events' into next

To quote the author:
This series replaces some more of the init hooks in board_f.c and
board_r.c with events. Notably it converts last_state_init() over.

It also provides a 'simple' event spy, which takes no arguments. It
turns out that this is quite a common case, so it is worth optimising
for this, to reduce code size, before events become too commonly used.

Finally, it introduces a way of emitting an event in an initcall,
instead of calling a function. This is likely to be used at least as
often as the functions, as we convert more of these initcalls.

As part of this, the initcall code is brought back into a C file. Somehow
the compiler has changed or something else, so that this does not confer
any benefits now.

For boards with EVENT enabled, this unfortunately results in small
growth, e.g. for firefly:

   aarch64: (for 1/1 boards) all +114.0 data +16.0 rodata +22.0 text +76.0
       arm: (for 1/1 boards) all +82.0 rodata +18.0 text +64.0

For boards without EVENT enabled the growth is smaller, e.g. nokia_rx51:

       arm: (for 1/1 boards) all +32.0 data +8.0 rodata -8.0 text +32.0

I cannot find a good way to avoid the latter, other than macro magic
with an embedded comma (to completely remove an event entry), which
seems nasty.

1 files changed, 4 insertions, 8 deletions

diff --git a/arch/mips/mach-pic32/cpu.c b/arch/mips/mach-pic32/cpu.c
index ec3c2505313..7ed306e045e 100644
--- a/arch/mips/mach-pic32/cpu.c
+++ b/arch/mips/mach-pic32/cpu.c
@@ -57,7 +57,7 @@ static ulong clk_get_cpu_rate(void)
 }
 
 /* initialize prefetch module related to cpu_clk */
-static void prefetch_init(void)
+static int prefetch_init(void)
 {
 	struct pic32_reg_atomic *regs;
 	const void __iomem *base;
@@ -93,16 +93,12 @@ static void prefetch_init(void)
 	/* Enable prefetch for all */
 	writel(0x30, &regs->set);
 	iounmap(regs);
-}
 
-/* arch specific CPU init after DM */
-static int pic32_flash_prefetch(void *ctx, struct event *event)
-{
-	/* flash prefetch */
-	prefetch_init();
 	return 0;
 }
-EVENT_SPY(EVT_DM_POST_INIT_F, pic32_flash_prefetch);
+
+/* arch-specific CPU init after DM: flash prefetch */
+EVENT_SPY_SIMPLE(EVT_DM_POST_INIT_F, prefetch_init);
 
 /* Un-gate DDR2 modules (gated by default) */
 static void ddr2_pmd_ungate(void)