diff options
Diffstat (limited to 'doc/usage/cmd')
| -rw-r--r-- | doc/usage/cmd/extension.rst | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/doc/usage/cmd/extension.rst b/doc/usage/cmd/extension.rst index 4c261e74951..fbe95aace79 100644 --- a/doc/usage/cmd/extension.rst +++ b/doc/usage/cmd/extension.rst @@ -25,9 +25,8 @@ Device Tree overlays depending on the detected extension boards. The "extension" command comes with three sub-commands: - - "extension scan" makes the generic code call the board-specific - extension_board_scan() function to retrieve the list of detected - extension boards. + - "extension scan" makes the generic code call a board-specific extension + function to retrieve the list of detected extension boards. - "extension list" allows to list the detected extension boards. @@ -98,17 +97,23 @@ Simple extension_board_scan function example .. code-block:: c - int extension_board_scan(struct list_head *extension_list) + static int foo_extension_board_scan(struct alist *extension_list) { - struct extension *extension; + struct extension extension = {0}; - extension = calloc(1, sizeof(struct extension)); - snprintf(extension->overlay, sizeof(extension->overlay), "overlay.dtbo"); - snprintf(extension->name, sizeof(extension->name), "extension board"); - snprintf(extension->owner, sizeof(extension->owner), "sandbox"); - snprintf(extension->version, sizeof(extension->version), "1.1"); - snprintf(extension->other, sizeof(extension->other), "Extension board information"); - list_add_tail(&extension->list, extension_list); + snprintf(extension.overlay, sizeof(extension.overlay), "overlay.dtbo"); + snprintf(extension.name, sizeof(extension.name), "extension board"); + snprintf(extension.owner, sizeof(extension.owner), "sandbox"); + snprintf(extension.version, sizeof(extension.version), "1.1"); + snprintf(extension.other, sizeof(extension.other), "Extension board information"); + if (!alist_add(extension_list, extension)) + return -ENOMEM; return 1; } + + U_BOOT_EXTENSION(foo_extension_name, foo_extension_board_scan); + + U_BOOT_DRVINFO(foo_extension_name) = { + .name = "foo_extension_name", + }; |