fdt: Swap the signature for board_fdt_blob_setup()

This returns a devicetree and updates a parameter with an error code.
Swap it, since this fits better with the way U-Boot normally works. It
also (more easily) allows leaving the existing pointer unchanged.

No yaks were harmed in this change, but there is a very small code-size
reduction.

For sifive, the OF_BOARD option must be set for the function to be
called, so there is no point in checking it again. Also OF_SEPARATE is
defined always.

Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Matthias Brugger <[email protected]>
Reviewed-by: Patrice Chotard <[email protected]>
[trini: Update total_compute]
Signed-off-by: Tom Rini <[email protected]>

3 files changed, 20 insertions, 15 deletions

diff --git a/arch/arm/mach-apple/board.c b/arch/arm/mach-apple/board.c
index 0b6d290b8ac..2644a04a622 100644
--- a/arch/arm/mach-apple/board.c
+++ b/arch/arm/mach-apple/board.c
@@ -691,11 +691,12 @@ int dram_init_banksize(void)
 
 extern long fw_dtb_pointer;
 
-void *board_fdt_blob_setup(int *err)
+int board_fdt_blob_setup(void **fdtp)
 {
 	/* Return DTB pointer passed by m1n1 */
-	*err = 0;
-	return (void *)fw_dtb_pointer;
+	*fdtp = (void *)fw_dtb_pointer;
+
+	return 0;
 }
 
 void build_mem_map(void)
diff --git a/arch/arm/mach-snapdragon/board.c b/arch/arm/mach-snapdragon/board.c
index 75a880f093c..f1319df4314 100644
--- a/arch/arm/mach-snapdragon/board.c
+++ b/arch/arm/mach-snapdragon/board.c
@@ -150,12 +150,12 @@ static void show_psci_version(void)
  * or for supporting quirky devices where it's easier to leave the downstream DT in place
  * to improve ABL compatibility. Otherwise, we use the DT provided by ABL.
  */
-void *board_fdt_blob_setup(int *err)
+int board_fdt_blob_setup(void **fdtp)
 {
 	struct fdt_header *fdt;
 	bool internal_valid, external_valid;
+	int ret = 0;
 
-	*err = 0;
 	fdt = (struct fdt_header *)get_prev_bl_fdt_addr();
 	external_valid = fdt && !fdt_check_header(fdt);
 	internal_valid = !fdt_check_header(gd->fdt_blob);
@@ -170,10 +170,11 @@ void *board_fdt_blob_setup(int *err)
 
 	if (internal_valid) {
 		debug("Using built in FDT\n");
+		ret = -EEXIST;
 	} else {
 		debug("Using external FDT\n");
 		/* So we can use it before returning */
-		gd->fdt_blob = fdt;
+		*fdtp = fdt;
 	}
 
 	/*
@@ -182,7 +183,7 @@ void *board_fdt_blob_setup(int *err)
 	 */
 	qcom_parse_memory();
 
-	return (void *)gd->fdt_blob;
+	return ret;
 }
 
 void reset_cpu(void)
diff --git a/arch/arm/mach-stm32mp/boot_params.c b/arch/arm/mach-stm32mp/boot_params.c
index ebddf6a7dbc..2d058edc419 100644
--- a/arch/arm/mach-stm32mp/boot_params.c
+++ b/arch/arm/mach-stm32mp/boot_params.c
@@ -6,6 +6,7 @@
 #define LOG_CATEGORY LOGC_ARCH
 
 #include <config.h>
+#include <errno.h>
 #include <log.h>
 #include <linux/libfdt.h>
 #include <asm/arch/sys_proto.h>
@@ -16,20 +17,22 @@
  * Use the saved FDT address provided by TF-A at boot time (NT_FW_CONFIG =
  * Non Trusted Firmware configuration file) when the pointer is valid
  */
-void *board_fdt_blob_setup(int *err)
+int board_fdt_blob_setup(void **fdtp)
 {
 	unsigned long nt_fw_dtb = get_stm32mp_bl2_dtb();
 
 	log_debug("%s: nt_fw_dtb=%lx\n", __func__, nt_fw_dtb);
 
-	*err = 0;
 	/* use external device tree only if address is valid */
-	if (nt_fw_dtb >= STM32_DDR_BASE) {
-		if (fdt_magic(nt_fw_dtb) == FDT_MAGIC)
-			return (void *)nt_fw_dtb;
-		log_debug("%s: DTB not found.\n", __func__);
+	if (nt_fw_dtb < STM32_DDR_BASE ||
+	    fdt_magic(nt_fw_dtb) != FDT_MAGIC) {
+		log_debug("DTB not found.\n");
+		log_debug("fall back to builtin DTB, %p\n", _end);
+
+		return -EEXIST;
 	}
-	log_debug("%s: fall back to builtin DTB, %p\n", __func__, _end);
 
-	return (void *)_end;
+	*fdtp = (void *)nt_fw_dtb;
+
+	return 0;
 }