[PATCH] fdtdec: drop needlessly convoluted CONFIG_PHANDLE_CHECK_SEQ

[Rasmus Villemoes]

Asking if the alias we found actually points at the device tree node
we passed in (in the guise of its offset from blob) can be done simply
by asking if the fdt_path_offset() of the alias' path is identical to
offset.

In fact, the current method suffers from the possibility of false
negatives: dtc does not necessarily emit a phandle property for a node
just because it is referenced in /aliases; it only emits a phandle
property for a node if it is referenced in <angle brackets>
somewhere. So if both the node we passed in and the alias node we're
considering don't have phandles, fdt_get_phandle() returns 0 for both.

Since the proper check is so simple, there's no reason to hide that
behind a config option (and if one really wanted that, it should be
called something else because there's no need to involve phandle in
the check).

Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
---
 configs/am65x_evm_a53_defconfig  | 1 -
 configs/evb-ast2600_defconfig    | 1 -
 configs/sama7g5ek_mmc1_defconfig | 1 -
 configs/sama7g5ek_mmc_defconfig  | 1 -
 lib/Kconfig                      | 7 -------
 lib/fdtdec.c                     | 7 ++-----
 6 files changed, 2 insertions(+), 16 deletions(-)

diff --git a/configs/am65x_evm_a53_defconfig b/configs/am65x_evm_a53_defconfig
index 9f41b397c3..a635d6d137 100644
--- a/configs/am65x_evm_a53_defconfig
+++ b/configs/am65x_evm_a53_defconfig
@@ -170,4 +170,3 @@ CONFIG_USB_GADGET_VENDOR_NUM=0x0451
 CONFIG_USB_GADGET_PRODUCT_NUM=0x6162
 CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_OF_LIBFDT_OVERLAY=y
-CONFIG_PHANDLE_CHECK_SEQ=y
diff --git a/configs/evb-ast2600_defconfig b/configs/evb-ast2600_defconfig
index ea75762926..015df20f09 100644
--- a/configs/evb-ast2600_defconfig
+++ b/configs/evb-ast2600_defconfig
@@ -84,4 +84,3 @@ CONFIG_WDT=y
 CONFIG_SHA384=y
 CONFIG_HEXDUMP=y
 # CONFIG_EFI_LOADER is not set
-CONFIG_PHANDLE_CHECK_SEQ=y
diff --git a/configs/sama7g5ek_mmc1_defconfig b/configs/sama7g5ek_mmc1_defconfig
index 42d96f7c02..3f33eb1142 100644
--- a/configs/sama7g5ek_mmc1_defconfig
+++ b/configs/sama7g5ek_mmc1_defconfig
@@ -76,4 +76,3 @@ CONFIG_TIMER=y
 CONFIG_MCHP_PIT64B_TIMER=y
 CONFIG_OF_LIBFDT_OVERLAY=y
 # CONFIG_EFI_LOADER_HII is not set
-CONFIG_PHANDLE_CHECK_SEQ=y
diff --git a/configs/sama7g5ek_mmc_defconfig b/configs/sama7g5ek_mmc_defconfig
index e03a6ba9af..6266eb0b59 100644
--- a/configs/sama7g5ek_mmc_defconfig
+++ b/configs/sama7g5ek_mmc_defconfig
@@ -76,4 +76,3 @@ CONFIG_TIMER=y
 CONFIG_MCHP_PIT64B_TIMER=y
 CONFIG_OF_LIBFDT_OVERLAY=y
 # CONFIG_EFI_LOADER_HII is not set
-CONFIG_PHANDLE_CHECK_SEQ=y
diff --git a/lib/Kconfig b/lib/Kconfig
index acc0ac081a..884569f9b1 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -958,11 +958,4 @@ config LMB_RESERVED_REGIONS
 	  Define the number of supported reserved regions in the library logical
 	  memory blocks.
 
-config PHANDLE_CHECK_SEQ
-	bool "Enable phandle check while getting sequence number"
-	help
-	  When there are multiple device tree nodes with same name,
-          enable this config option to distinguish them using
-	  phandles in fdtdec_get_alias_seq() function.
-
 endmenu
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index e20f6aad9c..ffa78f97ca 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -516,11 +516,8 @@ int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
 		 * Adding an extra check to distinguish DT nodes with
 		 * same name
 		 */
-		if (IS_ENABLED(CONFIG_PHANDLE_CHECK_SEQ)) {
-			if (fdt_get_phandle(blob, offset) !=
-			    fdt_get_phandle(blob, fdt_path_offset(blob, prop)))
-				continue;
-		}
+		if (offset != fdt_path_offset(blob, prop))
+			continue;
 
 		val = trailing_strtol(name);
 		if (val != -1) {
-- 
2.31.1