powerpc/mm: Do radix device tree scanning earlier

Like we just did for hash, split the device tree scanning parts out and
call them from mmu_early_init_devtree().
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/book3s/64/mmu.h

@@ -109,6 +109,7 @@ extern int mmu_io_psize;
 /* MMU initialization */
 void mmu_early_init_devtree(void);
 void hash__early_init_devtree(void);
+void radix__early_init_devtree(void);
 extern void radix_init_native(void);
 extern void hash__early_init_mmu(void);
 extern void radix__early_init_mmu(void);

arch/powerpc/mm/init_64.c

@@ -427,7 +427,9 @@ void __init mmu_early_init_devtree(void)
 	if (disable_radix)
 		cur_cpu_spec->mmu_features &= ~MMU_FTR_RADIX;
 
-	if (!radix_enabled())
+	if (radix_enabled())
+		radix__early_init_devtree();
+	else
 		hash__early_init_devtree();
 }
 #endif /* CONFIG_PPC_STD_MMU_64 */

arch/powerpc/mm/pgtable-radix.c

@@ -264,7 +264,7 @@ static int __init radix_dt_scan_page_sizes(unsigned long node,
 	return 1;
 }
 
-static void __init radix_init_page_sizes(void)
+void __init radix__early_init_devtree(void)
 {
 	int rc;
 
@@ -343,7 +343,6 @@ void __init radix__early_init_mmu(void)
 	__pte_frag_nr = H_PTE_FRAG_NR;
 	__pte_frag_size_shift = H_PTE_FRAG_SIZE_SHIFT;
 
-	radix_init_page_sizes();
 	if (!firmware_has_feature(FW_FEATURE_LPAR)) {
 		radix_init_native();
 		lpcr = mfspr(SPRN_LPCR);