[PATCH v3 10/15] lib: utils: fdt_fixup: Allow preserving PMU properties

[Yu Chien Peter Lin]

Add a scratch option to control PMU fixup, so the next
stage software can dump the PMU node including event
mapping information for debugging purposes.

Signed-off-by: Yu Chien Peter Lin <peterlin at andestech.com>
Reviewed-by: Anup Patel <anup at brainfault.org>
---
Changes v1 -> v2:
  - New patch
Changes v2 -> v3:
  - Rename to SBI_SCRATCH_PRESERVE_PMU_NODE (suggested by Anup)
  - Include Anup's RB tag
---
 include/sbi/sbi_scratch.h | 2 ++
 lib/utils/fdt/fdt_fixup.c | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/sbi/sbi_scratch.h b/include/sbi/sbi_scratch.h
index e6a33ba..0f67cde 100644
--- a/include/sbi/sbi_scratch.h
+++ b/include/sbi/sbi_scratch.h
@@ -151,6 +151,8 @@ enum sbi_scratch_options {
 	SBI_SCRATCH_NO_BOOT_PRINTS = (1 << 0),
 	/** Enable runtime debug prints */
 	SBI_SCRATCH_DEBUG_PRINTS = (1 << 1),
+	/** Preserve PMU node properties */
+	SBI_SCRATCH_PRESERVE_PMU_NODE = (1 << 2),
 };
 
 /** Get pointer to sbi_scratch for current HART */
diff --git a/lib/utils/fdt/fdt_fixup.c b/lib/utils/fdt/fdt_fixup.c
index e213ded..cf20edf 100644
--- a/lib/utils/fdt/fdt_fixup.c
+++ b/lib/utils/fdt/fdt_fixup.c
@@ -387,6 +387,8 @@ int fdt_reserved_memory_fixup(void *fdt)
 
 void fdt_fixups(void *fdt)
 {
+	struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
+
 	fdt_aplic_fixup(fdt);
 
 	fdt_imsic_fixup(fdt);
@@ -394,5 +396,7 @@ void fdt_fixups(void *fdt)
 	fdt_plic_fixup(fdt);
 
 	fdt_reserved_memory_fixup(fdt);
-	fdt_pmu_fixup(fdt);
+
+	if (!(scratch->options & SBI_SCRATCH_PRESERVE_PMU_NODE))
+		fdt_pmu_fixup(fdt);
 }
-- 
2.34.1