linux-kernel - [PATCH RFC v3 15/35] of: fdt: Add of_flat_read

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Thu, 25 Jan 2024 16:42:36 +0000
From: Alexandru Elisei <alexandru.elisei@....com>
To: catalin.marinas@....com,
	will@...nel.org,
	oliver.upton@...ux.dev,
	maz@...nel.org,
	james.morse@....com,
	suzuki.poulose@....com,
	yuzenghui@...wei.com,
	arnd@...db.de,
	akpm@...ux-foundation.org,
	mingo@...hat.com,
	peterz@...radead.org,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org,
	dietmar.eggemann@....com,
	rostedt@...dmis.org,
	bsegall@...gle.com,
	mgorman@...e.de,
	bristot@...hat.com,
	vschneid@...hat.com,
	mhiramat@...nel.org,
	rppt@...nel.org,
	hughd@...gle.com
Cc: pcc@...gle.com,
	steven.price@....com,
	anshuman.khandual@....com,
	vincenzo.frascino@....com,
	david@...hat.com,
	eugenis@...gle.com,
	kcc@...gle.com,
	hyesoo.yu@...sung.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	kvmarm@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org,
	linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH RFC v3 15/35] of: fdt: Add of_flat_read_u32()

Add the function of_flat_read_u32() to return the value of a property as
an u32.

Signed-off-by: Alexandru Elisei <alexandru.elisei@....com>
---

Changes since rfc v2:

* New patch, suggested by Rob Herring.

 drivers/of/fdt.c       | 21 +++++++++++++++++++++
 include/linux/of_fdt.h |  2 ++
 2 files changed, 23 insertions(+)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index bf502ba8da95..dfcd79fd5fd9 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -755,6 +755,27 @@ const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
 	return fdt_getprop(initial_boot_params, node, name, size);
 }
 
+/*
+ * of_flat_read_u32 - Return the value of the given property as an u32.
+ *
+ * @node: device node from which the property value is to be read
+ * @propname: name of the property
+ * @out_value: the value of the property
+ * @return: 0 on success, -EINVAL if property does not exist
+ */
+int __init of_flat_read_u32(unsigned long node, const char *propname,
+			    u32 *out_value)
+{
+	const __be32 *reg;
+
+	reg = of_get_flat_dt_prop(node, propname, NULL);
+	if (!reg)
+		return -EINVAL;
+
+	*out_value = be32_to_cpup(reg);
+	return 0;
+}
+
 /**
  * of_fdt_is_compatible - Return true if given node from the given blob has
  * compat in its compatible list
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index 0e26f8c3b10e..d7901699061b 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -57,6 +57,8 @@ extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
 extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
 extern unsigned long of_get_flat_dt_root(void);
 extern uint32_t of_get_flat_dt_phandle(unsigned long node);
+extern int of_flat_read_u32(unsigned long node, const char *propname,
+			    u32 *out_value);
 
 extern int early_init_dt_scan_chosen(char *cmdline);
 extern int early_init_dt_scan_memory(void);
-- 
2.43.0