[PATCH v3 14/20] board: sandbox: Convert extension support to UCLASS framework

Kory Maincent (TI.com)
2025-10-13T13:34:58Z

Migrate sandbox extension board detection from legacy implementation to
the new UCLASS-based extension board framework.

Signed-off-by: Kory Maincent (TI.com) <kory.maincent@bootlin.com>
---

Change in v3:
- Use U_BOOT_DRVINFO.
---
arch/Kconfig | 2 +-
board/sandbox/sandbox.c | 28 ++++++++++++++++------------
2 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 7e05e0c2263..5bb65a29f8d 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -215,7 +215,7 @@ config SANDBOX
select SYSRESET_CMD_POWEROFF if CMD_POWEROFF
select SYS_CACHE_SHIFT_4
select IRQ
- select SUPPORT_EXTENSION_SCAN if CMDLINE
+ select SUPPORT_DM_EXTENSION_SCAN if CMDLINE
select SUPPORT_ACPI
imply BITREVERSE
select BLOBLIST
diff --git a/board/sandbox/sandbox.c b/board/sandbox/sandbox.c
index c5d7b9651a9..77e5a0478ca 100644
--- a/board/sandbox/sandbox.c
+++ b/board/sandbox/sandbox.c
@@ -111,27 +111,31 @@ int ft_board_setup(void *fdt, struct bd_info *bd)
}

#ifdef CONFIG_CMD_EXTENSION
-int extension_board_scan(struct list_head *extension_list)
+static int sandbox_extension_board_scan(struct udevice *dev,
+ struct alist *extension_list)
{
int i;

for (i = 0; i < 2; i++) {
- struct extension *extension;
-
- extension = calloc(1, sizeof(struct extension));
- if (!extension)
+ struct extension extension = {0};
+
+ snprintf(extension.overlay, sizeof(extension.overlay), "overlay%d.dtbo", i);
+ snprintf(extension.name, sizeof(extension.name), "extension board %d", i);
+ snprintf(extension.owner, sizeof(extension.owner), "sandbox");
+ snprintf(extension.version, sizeof(extension.version), "1.1");
+ snprintf(extension.other, sizeof(extension.other), "Fictional extension board");
+ if (!alist_add(extension_list, extension))
return -ENOMEM;
-
- snprintf(extension->overlay, sizeof(extension->overlay), "overlay%d.dtbo", i);
- snprintf(extension->name, sizeof(extension->name), "extension board %d", i);
- snprintf(extension->owner, sizeof(extension->owner), "sandbox");
- snprintf(extension->version, sizeof(extension->version), "1.1");
- snprintf(extension->other, sizeof(extension->other), "Fictional extension board");
- list_add_tail(&extension->list, extension_list);
}

return i;
}
+
+U_BOOT_EXTENSION(sandbox_extension, sandbox_extension_board_scan);
+
+U_BOOT_DRVINFO(sandbox_extension) = {
+ .name = "sandbox_extension",
+};
#endif

#ifdef CONFIG_BOARD_LATE_INIT

--
2.43.0