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Sun, 02 Nov 2025 20:38:38 -0800 (PST) Received: from Latitude-7490.ht.home ([2607:fa49:8c41:2600:4474:25a:7017:ff44]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8ac02f854a0sm594864185a.27.2025.11.02.20.38.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 02 Nov 2025 20:38:37 -0800 (PST) From: chalianis1@gmail.com To: s.hauer@pengutronix.de Cc: barebox@lists.infradead.org, Chali Anis Date: Sun, 2 Nov 2025 23:38:32 -0500 Message-Id: <20251103043833.149013-1-chalianis1@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251102_203840_550897_5770DE27 X-CRM114-Status: GOOD ( 15.67 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-3.4 required=4.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 1/2] drivers: misc: external_state: add a barebox external state. X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) From: Chali Anis Add a driver to use an external state dtb, gives the ability to define an external state at compile time. useful for yocto or buildroot defining a state.dtb that will be passed to barebox at compile time vi a defconfig fragment. Signed-off-by: Chali Anis --- drivers/misc/Kconfig | 13 ++++++++ drivers/misc/Makefile | 1 + drivers/misc/external_state.c | 58 +++++++++++++++++++++++++++++++++++ 3 files changed, 72 insertions(+) create mode 100644 drivers/misc/external_state.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index e235646ee551..91075788b5b8 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -21,6 +21,19 @@ config STATE_DRV depends on OFDEVICE depends on STATE +config EXTERNAL_STATE + tristate "Use external barebox state dtb" + depends on OFDEVICE + depends on STATE + help + This permits the use of an extranl dtb state blob + which permits to dynamicly at compile time specify + an external blob vi EXTERNAL_STATE_DTB_PATH + +config EXTERNAL_STATE_DTB_PATH + string "the external barebox state dtb path" + depends on EXTERNAL_STATE + config DEV_MEM bool "Generic memory I/O device (/dev/mem)" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index c4b61de7b8b5..eba19f8c22c3 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_JTAG) += jtag.o obj-$(CONFIG_SRAM) += sram.o obj-$(CONFIG_STATE_DRV) += state.o +obj-$(CONFIG_EXTERNAL_STATE) += external_state.o obj-$(CONFIG_DEV_MEM) += mem.o obj-$(CONFIG_DEV_PORT) += port.o obj-$(CONFIG_UBOOTVAR) += ubootvar.o diff --git a/drivers/misc/external_state.c b/drivers/misc/external_state.c new file mode 100644 index 000000000000..d392133d3370 --- /dev/null +++ b/drivers/misc/external_state.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2014 Sascha Hauer , Pengutronix + * Copyright (C) 2025 Anis Chali , Ro-Main + */ + +#include +#include +#include +#include +#include + +#include + +static int state_external_init(void) +{ + const char *dt_path = CONFIG_EXTERNAL_STATE_DTB_PATH; + struct device_node *state_root = NULL; + size_t size; + void *fdt; + int ret; + + if (strlen(dt_path) <= 0) + return -EINVAL; + + fdt = read_file(dt_path, &size); + if (!fdt) { + pr_info("unable to read %s: %m\n", dt_path); + return 0; + } + + state_root = of_unflatten_dtb(fdt, size); + if (!IS_ERR(state_root)) { + struct device_node *np = NULL; + struct state *state; + + ret = barebox_register_of(state_root); + if (ret) + pr_warn("Failed to register device-tree: %pe\n", ERR_PTR(ret)); + + np = of_find_node_by_alias(state_root, "state"); + + state = state_new_from_node(np, false); + if (IS_ERR(state)) + return PTR_ERR(state); + + ret = state_load(state); + if (ret != -ENOMEDIUM) + pr_warn("Failed to load persistent state, continuing with defaults, %d\n", + ret); + + return 0; + } + + return -EINVAL; +} + +late_initcall(state_external_init); -- 2.34.1