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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
commit76cb841cb886eef6b3bee341a2266c76578724ad (patch)
treef5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/powerpc/sysdev/mpc5xxx_clocks.c
parentInitial commit. (diff)
downloadlinux-c109f8d9e922037b3fa45f46d78384d49db8ad76.tar.xz
linux-c109f8d9e922037b3fa45f46d78384d49db8ad76.zip
Adding upstream version 4.19.249.upstream/4.19.249upstream
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.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mpc5xxx_clocks.c b/arch/powerpc/sysdev/mpc5xxx_clocks.c
new file mode 100644
index 000000000..834a6d7fb
--- /dev/null
+++ b/arch/powerpc/sysdev/mpc5xxx_clocks.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * mpc5xxx_get_bus_frequency - Find the bus frequency for a device
+ * @node: device node
+ *
+ * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
+ * or 0 if the bus frequency cannot be found.
+ */
+
+#include <linux/kernel.h>
+#include <linux/of_platform.h>
+#include <linux/export.h>
+#include <asm/mpc5xxx.h>
+
+unsigned long mpc5xxx_get_bus_frequency(struct device_node *node)
+{
+ const unsigned int *p_bus_freq = NULL;
+
+ of_node_get(node);
+ while (node) {
+ p_bus_freq = of_get_property(node, "bus-frequency", NULL);
+ if (p_bus_freq)
+ break;
+
+ node = of_get_next_parent(node);
+ }
+ of_node_put(node);
+
+ return p_bus_freq ? *p_bus_freq : 0;
+}
+EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);