powerpc/mpc5xxx: Switch mpc5xxx_get_bus_frequency() to use fwnode

Switch mpc5xxx_get_bus_frequency() to use fwnode in order to help
cleaning up other parts of the kernel from OF specific code.

No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Chris Packham <chris.packham@alliedtelesis.co.nz> # for i2c-mpc
Acked-by: Wolfram Sang <wsa@kernel.org> # for the I2C part
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> # for mscan/mpc5xxx_can
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220507100147.5802-2-andriy.shevchenko@linux.intel.com

1 files changed, 22 insertions, 19 deletions

diff --git a/arch/powerpc/sysdev/mpc5xxx_clocks.c b/arch/powerpc/sysdev/mpc5xxx_clocks.c
index 834a6d7fbd88..c5bf7e1b3780 100644
--- a/arch/powerpc/sysdev/mpc5xxx_clocks.c
+++ b/arch/powerpc/sysdev/mpc5xxx_clocks.c
@@ -1,31 +1,34 @@
 // 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 <linux/property.h>
+
 #include <asm/mpc5xxx.h>
 
-unsigned long mpc5xxx_get_bus_frequency(struct device_node *node)
+/**
+ * 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)
 {
-	const unsigned int *p_bus_freq = NULL;
+	struct fwnode_handle *parent;
+	u32 bus_freq;
+	int ret;
 
-	of_node_get(node);
-	while (node) {
-		p_bus_freq = of_get_property(node, "bus-frequency", NULL);
-		if (p_bus_freq)
-			break;
+	ret = fwnode_property_read_u32(fwnode, "bus-frequency", &bus_freq);
+	if (!ret)
+		return bus_freq;
 
-		node = of_get_next_parent(node);
+	fwnode_for_each_parent_node(fwnode, parent) {
+		ret = fwnode_property_read_u32(parent, "bus-frequency", &bus_freq);
+		if (!ret)
+			return bus_freq;
 	}
-	of_node_put(node);
 
-	return p_bus_freq ? *p_bus_freq : 0;
+	return 0;
 }
-EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);
+EXPORT_SYMBOL(mpc5xxx_fwnode_get_bus_frequency);