summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/sysdev/mpc5xxx_clocks.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/powerpc/sysdev/mpc5xxx_clocks.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/sysdev/mpc5xxx_clocks.c')
-rw-r--r--arch/powerpc/sysdev/mpc5xxx_clocks.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mpc5xxx_clocks.c b/arch/powerpc/sysdev/mpc5xxx_clocks.c
new file mode 100644
index 0000000000..58cee28e23
--- /dev/null
+++ b/arch/powerpc/sysdev/mpc5xxx_clocks.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/property.h>
+
+#include <asm/mpc5xxx.h>
+
+/**
+ * mpc5xxx_fwnode_get_bus_frequency - Find the bus frequency for a firmware node
+ * @fwnode: firmware node
+ *
+ * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
+ * or 0 if the bus frequency cannot be found.
+ */
+unsigned long mpc5xxx_fwnode_get_bus_frequency(struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *parent;
+ u32 bus_freq;
+ int ret;
+
+ ret = fwnode_property_read_u32(fwnode, "bus-frequency", &bus_freq);
+ if (!ret)
+ return bus_freq;
+
+ fwnode_for_each_parent_node(fwnode, parent) {
+ ret = fwnode_property_read_u32(parent, "bus-frequency", &bus_freq);
+ if (!ret) {
+ fwnode_handle_put(parent);
+ return bus_freq;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(mpc5xxx_fwnode_get_bus_frequency);