Re: [PATCH v2 2/2] fdt: Swap the signature for board_fdt_blob_setup()

On Tue, 26 Nov 2024 at 10:10, Patrice CHOTARD patrice.chotard@foss.st.com wrote:

On 11/2/24 18:49, Simon Glass wrote:

...

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 sjg@chromium.org

Changes in v2:

• Set up the existing FDT in case the board wants to check it
• Update snapdragon to return -EEXIST
• Set the existing FDT before calling board_fd_blob_setup()
• Update sandbox to return -EEXIST if an fdt comes from a bloblist
• Update do_go_uboot() to set the existing FDT
• Drop unnecessary setting of FDT in vexpress64
• Tidy up redundant RISC-V code

arch/arm/mach-apple/board.c | 7 ++-- arch/arm/mach-snapdragon/board.c | 9 ++--- arch/arm/mach-stm32mp/boot_params.c | 19 ++++++----- arch/sandbox/cpu/cpu.c | 34 +++++++++---------- board/Marvell/octeontx/board-fdt.c | 12 +++---- board/Marvell/octeontx2/board-fdt.c | 12 +++---- board/Marvell/octeontx2/board.c | 3 +- board/andestech/ae350/ae350.c | 23 +++++++------ board/armltd/vexpress64/vexpress64.c | 33 ++++++++---------- board/broadcom/bcmstb/bcmstb.c | 7 ++-- board/emulation/qemu-arm/qemu-arm.c | 7 ++-- board/emulation/qemu-ppce500/qemu-ppce500.c | 12 +++---- board/emulation/qemu-riscv/qemu-riscv.c | 7 ++-- board/highbank/highbank.c | 7 ++-- board/raspberrypi/rpi/rpi.c | 13 ++++--- board/sifive/unleashed/unleashed.c | 12 +++---- board/sifive/unmatched/unmatched.c | 11 +++--- .../visionfive2/starfive_visionfive2.c | 11 +++--- board/xen/xenguest_arm64/xenguest_arm64.c | 14 ++++---- board/xilinx/common/board.c | 26 ++++++++------ include/fdtdec.h | 9 ++--- lib/fdtdec.c | 14 +++++--- 22 files changed, 152 insertions(+), 150 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 2ab2ceb5138..cd49de540f0 100644 --- a/arch/arm/mach-snapdragon/board.c +++ b/arch/arm/mach-snapdragon/board.c @@ -147,12 +147,12 @@ 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);
  

@@ -167,10 +167,11 @@ 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;
  }
  
  /*
  

@@ -179,7 +180,7 @@ 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;
  

}

For mach-stm32mp: Reviewed-by: Patrice Chotard patrice.chotard@foss.st.com

Thanks

Applied to sjg/master, thanks!