linux-kernel - [PATCH v4 1/2] of: property: add of_property_for_each

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Message-Id: <20240804-clk-u64-v4-1-8e55569f39a4@nxp.com>
Date: Sun, 04 Aug 2024 20:32:55 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-clk@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: [PATCH v4 1/2] of: property: add of_property_for_each_u64

From: Peng Fan <peng.fan@....com>

Preparing for assigned-clock-rates-u64 support, add function
of_property_for_each_u64 to iterate each u64 value

Reviewed-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/of/property.c | 23 +++++++++++++++++++++++
 include/linux/of.h    | 23 +++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/drivers/of/property.c b/drivers/of/property.c
index 164d77cb9445..f70fd8deb9cd 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -548,6 +548,29 @@ const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
 }
 EXPORT_SYMBOL_GPL(of_prop_next_u32);
 
+const __be64 *of_prop_next_u64(struct property *prop, const __be64 *cur,
+			       u64 *pu)
+{
+	const void *curv = cur;
+
+	if (!prop)
+		return NULL;
+
+	if (!cur) {
+		curv = prop->value;
+		goto out_val;
+	}
+
+	curv += sizeof(*cur);
+	if (curv >= prop->value + prop->length)
+		return NULL;
+
+out_val:
+	*pu = be64_to_cpup(curv);
+	return curv;
+}
+EXPORT_SYMBOL_GPL(of_prop_next_u64);
+
 const char *of_prop_next_string(struct property *prop, const char *cur)
 {
 	const void *curv = cur;
diff --git a/include/linux/of.h b/include/linux/of.h
index 85b60ac9eec5..de481a4bdad0 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -437,6 +437,16 @@ extern int of_detach_node(struct device_node *);
  */
 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
 			       u32 *pu);
+
+/*
+ * u64 u;
+ *
+ * of_property_for_each_u64(np, "propname", u)
+ *         printk("U64 value: %llx\n", u);
+ */
+const __be64 *of_prop_next_u64(struct property *prop, const __be64 *cur,
+			       u64 *pu);
+
 /*
  * struct property *prop;
  * const char *s;
@@ -832,6 +842,12 @@ static inline const __be32 *of_prop_next_u32(struct property *prop,
 	return NULL;
 }
 
+static inline const __be64 *of_prop_next_u64(struct property *prop,
+		const __be64 *cur, u64 *pu)
+{
+	return NULL;
+}
+
 static inline const char *of_prop_next_string(struct property *prop,
 		const char *cur)
 {
@@ -1436,6 +1452,13 @@ static inline int of_property_read_s32(const struct device_node *np,
 	     _it.item;							\
 	     _it.item = of_prop_next_u32(_it.prop, _it.item, &u))
 
+#define of_property_for_each_u64(np, propname, u)			\
+	for (struct {struct property *prop; const __be64 *item; } _it =	\
+		{of_find_property(np, propname, NULL),			\
+		 of_prop_next_u64(_it.prop, NULL, &u)};			\
+		_it.item;						\
+		_it.item = of_prop_next_u64(_it.prop, _it.item, &u))
+
 #define of_property_for_each_string(np, propname, prop, s)	\
 	for (prop = of_find_property(np, propname, NULL),	\
 		s = of_prop_next_string(prop, NULL);		\

-- 
2.37.1