Introduce a common fdt operations library for basic device tree operations that are common between various boards.
The first library to introduce here is the capability to set up fdtfile as a standard variable as part of board identification rather than depend on scripted ifdeffery.
Reviewed-by: Jonathan Humphreys j-humphreys@ti.com Reviewed-by: Roger Quadros rogerq@kernel.org Signed-off-by: Nishanth Menon nm@ti.com --- Changes since V3: * No change
V3: https://lore.kernel.org/r/20240130130615.670783-3-nm@ti.com
board/ti/common/Kconfig | 12 ++++++++ board/ti/common/Makefile | 1 + board/ti/common/fdt_ops.c | 64 +++++++++++++++++++++++++++++++++++++++ board/ti/common/fdt_ops.h | 42 +++++++++++++++++++++++++ 4 files changed, 119 insertions(+) create mode 100644 board/ti/common/fdt_ops.c create mode 100644 board/ti/common/fdt_ops.h
diff --git a/board/ti/common/Kconfig b/board/ti/common/Kconfig index 49edd98014ab..de44e4de2115 100644 --- a/board/ti/common/Kconfig +++ b/board/ti/common/Kconfig @@ -49,3 +49,15 @@ config TI_COMMON_CMD_OPTIONS imply CMD_SPI imply CMD_TIME imply CMD_USB if USB + +config TI_FDT_FOLDER_PATH + string "Location of Folder path where dtb is present" + default "ti/davinci" if ARCH_DAVINCI + default "ti/keystone" if ARCH_KEYSTONE + default "ti/omap" if ARCH_OMAP2PLUS + default "ti" if ARCH_K3 + depends on ARCH_DAVINCI || ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3 + help + Folder path for kernel device tree default. + This is used along with fdtfile path to locate the kernel + device tree blob. diff --git a/board/ti/common/Makefile b/board/ti/common/Makefile index 26bf12e2e6d5..5ac361ba7fcf 100644 --- a/board/ti/common/Makefile +++ b/board/ti/common/Makefile @@ -3,3 +3,4 @@
obj-${CONFIG_TI_I2C_BOARD_DETECT} += board_detect.o obj-${CONFIG_CMD_EXTENSION} += cape_detect.o +obj-${CONFIG_OF_LIBFDT} += fdt_ops.o diff --git a/board/ti/common/fdt_ops.c b/board/ti/common/fdt_ops.c new file mode 100644 index 000000000000..eb917be9e0da --- /dev/null +++ b/board/ti/common/fdt_ops.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Library to support FDT file operations which are common + * + * Copyright (C) 2024 Texas Instruments Incorporated - https://www.ti.com/ + */ + +#include <env.h> +#include <vsprintf.h> +#include "fdt_ops.h" + +void ti_set_fdt_env(const char *board_name, struct ti_fdt_map *fdt_map) +{ + char *fdt_file_name = NULL; + char fdtfile[TI_FDT_FILE_MAX]; + + if (board_name) { + while (fdt_map) { + /* Check for NULL terminator in the list */ + if (!fdt_map->board_name) + break; + if (!strncmp(fdt_map->board_name, board_name, TI_BOARD_NAME_MAX)) { + fdt_file_name = fdt_map->fdt_file_name; + break; + } + fdt_map++; + } + } + + /* match not found OR null board_name */ + if (!fdt_file_name) { + /* + * Prioritize CONFIG_DEFAULT_FDT_FILE - if that is not defined, + * or is empty, then use CONFIG_DEFAULT_DEVICE_TREE + */ +#ifdef CONFIG_DEFAULT_FDT_FILE + if (strlen(CONFIG_DEFAULT_FDT_FILE)) { + snprintf(fdtfile, sizeof(fdtfile), "%s/%s", + CONFIG_TI_FDT_FOLDER_PATH, CONFIG_DEFAULT_FDT_FILE); + } else +#endif + { + snprintf(fdtfile, sizeof(fdtfile), "%s/%s.dtb", + CONFIG_TI_FDT_FOLDER_PATH, CONFIG_DEFAULT_DEVICE_TREE); + } + } else { + snprintf(fdtfile, sizeof(fdtfile), "%s/%s", CONFIG_TI_FDT_FOLDER_PATH, + fdt_file_name); + } + + env_set("fdtfile", fdtfile); + + /* + * XXX: DEPRECATION WARNING: 2 u-boot versions (2024.10). + * + * Maintain compatibility with downstream scripts that may be using + * name_fdt + */ + if (board_name) + env_set("name_fdt", fdtfile); + /* Also set the findfdt legacy script to warn users to stop using this */ + env_set("findfdt", + "echo WARN: fdtfile already set. Stop using findfdt in script"); +} diff --git a/board/ti/common/fdt_ops.h b/board/ti/common/fdt_ops.h new file mode 100644 index 000000000000..5d304994fb6e --- /dev/null +++ b/board/ti/common/fdt_ops.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Library to support common device tree manipulation for TI EVMs + * + * Copyright (C) 2024 Texas Instruments Incorporated - https://www.ti.com + */ + +#ifndef __FDT_OPS_H +#define __FDT_OPS_H + +#define TI_BOARD_NAME_MAX 20 +#define TI_FDT_FILE_MAX 200 + +/** + * struct ti_fdt_map - mapping of device tree blob name to board name + * @board_name: board_name up to TI_BOARD_NAME_MAX long + * @fdt_file_name: device tree blob name as described by kernel + */ +struct ti_fdt_map { + const char *board_name; + char *fdt_file_name; +}; + +/** + * ti_set_fdt_env - Find the correct device tree file name based on the + * board name and set 'fdtfile' env variable with correct folder + * structure appropriate to the architecture and Linux kernel's + * 'make install_dtbs' conventions. This function is invoked typically + * as part of board_late_init. + * + * fdt name is picked by: + * a) If a board name match is found, use the match + * b) If not, CONFIG_DEFAULT_FDT_FILE (Boot OS device tree) if that is defined + * and not null + * c) If not, Use CONFIG_DEFAULT_DEVICE_TREE (DT control for bootloader) + * + * @board_name: match to search with (max of TI_BOARD_NAME_MAX chars) + * @fdt_map: NULL terminated array of device tree file name matches. + */ +void ti_set_fdt_env(const char *board_name, struct ti_fdt_map *fdt_map); + +#endif /* __FDT_OPS_H */