linux-kernel - [RFC PATCH 2/3] of: fdt: print dtb build information

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Message-ID: <20200113181625.3130-3-alexandre.torgue@st.com>
Date:   Mon, 13 Jan 2020 19:16:24 +0100
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     <robh+dt@...nel.org>, Frank Rowand <frowand.list@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        <david@...son.dropbear.id.au>, <sjg@...omium.org>
CC:     <devicetree@...r.kernel.org>,
        Alexandre Torgue <alexandre.torgue@...com>,
        <linux-kernel@...r.kernel.org>, <linux-kbuild@...r.kernel.org>,
        <devicetree-compiler@...r.kernel.org>
Subject: [RFC PATCH 2/3] of: fdt: print dtb build information

This commit prints out DTB build information (build time, dts source
version used, ...) if "Build-info" property exists in DTB root node.

Signed-off-by: Alexandre Torgue <alexandre.torgue@...com>

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 2cdf64d2456f..df5f54f9582a 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1224,9 +1224,18 @@ bool __init early_init_dt_scan(void *params)
  */
 void __init unflatten_device_tree(void)
 {
+	const char *build_info;
+	unsigned long dt_root;
+
 	__unflatten_device_tree(initial_boot_params, NULL, &of_root,
 				early_init_dt_alloc_memory_arch, false);
 
+	/* If available, provide dtb build information */
+	dt_root = of_get_flat_dt_root();
+	build_info = of_get_flat_dt_prop(dt_root, "Build-info", NULL);
+	if (build_info)
+		pr_info("%s\n", build_info);
+
 	/* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
 	of_alias_scan(early_init_dt_alloc_memory_arch);
 
-- 
2.17.1