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Date: Thu, 25 Aug 2011 17:43:42 -0600
From: Stephen Warren <swarren@...dia.com>
To: Grant Likely <grant.likely@...retlab.ca>,
Colin Cross <ccross@...roid.com>,
Erik Gilling <konkers@...roid.com>,
Olof Johansson <olof@...om.net>
Cc: Russell King <linux@....linux.org.uk>,
Arnd Bergmann <arnd@...db.de>,
devicetree-discuss@...ts.ozlabs.org, linux-tegra@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Belisko Marek <marek.belisko@...il.com>,
Jamie Iles <jamie@...ieiles.com>,
Shawn Guo <shawn.guo@...escale.com>,
Sergei Shtylyov <sshtylyov@...sta.com>,
Linus Walleij <linus.walleij@...aro.org>,
Stephen Warren <swarren@...dia.com>
Subject: [PATCH v3 11/13] of: add property iteration helpers
This patch adds macros for_each_u32_property_value and
for_each_string_property_value, which iterate over an array of values
within a device-tree property. Usage is for example:
struct of_iter_string_prop iter;
for_each_string_property_value(iter, np, "pins")
printk("Got value %s\n", iter.value);
Signed-off-by: Stephen Warren <swarren@...dia.com>
---
include/linux/of_iter_prop.h | 135 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 135 insertions(+), 0 deletions(-)
create mode 100644 include/linux/of_iter_prop.h
diff --git a/include/linux/of_iter_prop.h b/include/linux/of_iter_prop.h
new file mode 100644
index 0000000..c7fb2bf
--- /dev/null
+++ b/include/linux/of_iter_prop.h
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2011 NVIDIA Inc.
+ *
+ * Iterate over properties that store arrays.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#ifndef __OF_ITER_PROP_H__
+#define __OF_ITER_PROP_H__
+
+#include <linux/of.h>
+
+#ifdef CONFIG_OF
+struct of_iter_u32_prop {
+ const struct property *prop;
+ int len;
+ const __be32 *pvalue;
+ u32 value;
+};
+
+static inline void of_iter_u32_next(struct of_iter_u32_prop *iter)
+{
+ if (iter->len < 0)
+ return;
+
+ iter->value = be32_to_cpup(iter->pvalue++);
+ iter->len--;
+}
+
+static inline void of_iter_u32_init(struct of_iter_u32_prop *iter,
+ const struct device_node *np,
+ const char *name)
+{
+ iter->prop = of_find_property(np, name, &iter->len);
+ if (!iter->prop) {
+ iter->len = -1;
+ return;
+ }
+
+ iter->pvalue = iter->prop->value;
+ if (!iter->pvalue) {
+ iter->len = -1;
+ return;
+ }
+
+ iter->len /= sizeof(*iter->pvalue);
+
+ of_iter_u32_next(iter);
+}
+
+static inline bool of_iter_u32_test(struct of_iter_u32_prop *iter)
+{
+ return iter->len >= 0;
+}
+
+#define for_each_u32_property_value(iter, np, prop_name) \
+ for (of_iter_u32_init(&iter, np, prop_name); \
+ of_iter_u32_test(&iter); \
+ of_iter_u32_next(&iter))
+
+struct of_iter_string_prop {
+ const struct property *prop;
+ int len;
+ const char *value;
+ const char *after;
+};
+
+static inline void of_iter_string_init(struct of_iter_string_prop *iter,
+ const struct device_node *np,
+ const char *name)
+{
+ iter->prop = of_find_property(np, name, &iter->len);
+ if (!iter->prop) {
+ iter->value = NULL;
+ return;
+ }
+
+ iter->value = iter->prop->value;
+ if (!iter->value)
+ return;
+
+ iter->after = iter->value + iter->len;
+}
+
+static inline bool of_iter_string_test(struct of_iter_string_prop *iter)
+{
+ if (!iter->value)
+ return false;
+
+ return iter->value < iter->after;
+}
+
+static inline void of_iter_string_next(struct of_iter_string_prop *iter)
+{
+ int len;
+
+ if (!iter->value)
+ return;
+
+ len = strnlen(iter->value, iter->len);
+ iter->len -= len;
+ iter->value += len + 1;
+}
+
+#define for_each_string_property_value(iter, np, prop_name) \
+ for (of_iter_string_init(&iter, np, prop_name); \
+ of_iter_string_test(&iter); \
+ of_iter_string_next(&iter))
+
+#else
+struct of_iter_u32_prop {
+ u32 value;
+};
+
+#define for_each_u32_property_value(iter, np, prop_name) \
+ while (0)
+
+struct of_iter_string_prop {
+ const char *value;
+};
+
+#define for_each_string_property_value(iter, np, prop_name) \
+ while (0)
+
+#endif /* CONFIG_OF */
+
+#endif /* __OF_ITER_PROP_H__ */
--
1.7.0.4
--
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