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

arch/powerpc/include/asm/mpc5xxx.h

@@ -11,7 +11,14 @@
 #ifndef __ASM_POWERPC_MPC5xxx_H__
 #define __ASM_POWERPC_MPC5xxx_H__
 
-extern unsigned long mpc5xxx_get_bus_frequency(struct device_node *node);
+#include <linux/property.h>
+
+unsigned long mpc5xxx_fwnode_get_bus_frequency(struct fwnode_handle *fwnode);
+
+static inline unsigned long mpc5xxx_get_bus_frequency(struct device *dev)
+{
+	return mpc5xxx_fwnode_get_bus_frequency(dev_fwnode(dev));
+}
 
 #endif /* __ASM_POWERPC_MPC5xxx_H__ */
 

arch/powerpc/platforms/52xx/mpc52xx_gpt.c

@@ -722,7 +722,7 @@ static int mpc52xx_gpt_probe(struct platform_device *ofdev)
 
 	raw_spin_lock_init(&gpt->lock);
 	gpt->dev = &ofdev->dev;
-	gpt->ipb_freq = mpc5xxx_get_bus_frequency(ofdev->dev.of_node);
+	gpt->ipb_freq = mpc5xxx_get_bus_frequency(&ofdev->dev);
 	gpt->regs = of_iomap(ofdev->dev.of_node, 0);
 	if (!gpt->regs)
 		return -ENOMEM;

arch/powerpc/sysdev/mpc5xxx_clocks.c

 // 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);

drivers/ata/pata_mpc52xx.c

@@ -683,7 +683,7 @@ static int mpc52xx_ata_probe(struct platform_device *op)
 	struct bcom_task *dmatsk;
 
 	/* Get ipb frequency */
-	ipb_freq = mpc5xxx_get_bus_frequency(op->dev.of_node);
+	ipb_freq = mpc5xxx_get_bus_frequency(&op->dev);
 	if (!ipb_freq) {
 		dev_err(&op->dev, "could not determine IPB bus frequency\n");
 		return -ENODEV;

drivers/i2c/busses/i2c-mpc.c

@@ -239,6 +239,7 @@ static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
 static int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
 					  u32 *real_clk)
 {
+	struct fwnode_handle *fwnode = of_fwnode_handle(node);
 	const struct mpc_i2c_divider *div = NULL;
 	unsigned int pvr = mfspr(SPRN_PVR);
 	u32 divider;
@@ -246,12 +247,12 @@ static int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
 
 	if (clock == MPC_I2C_CLOCK_LEGACY) {
 		/* see below - default fdr = 0x3f -> div = 2048 */
-		*real_clk = mpc5xxx_get_bus_frequency(node) / 2048;
+		*real_clk = mpc5xxx_fwnode_get_bus_frequency(fwnode) / 2048;
 		return -EINVAL;
 	}
 
 	/* Determine divider value */
-	divider = mpc5xxx_get_bus_frequency(node) / clock;
+	divider = mpc5xxx_fwnode_get_bus_frequency(fwnode) / clock;
 
 	/*
 	 * We want to choose an FDR/DFSR that generates an I2C bus speed that
@@ -266,7 +267,7 @@ static int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
 			break;
 	}
 
-	*real_clk = mpc5xxx_get_bus_frequency(node) / div->divider;
+	*real_clk = mpc5xxx_fwnode_get_bus_frequency(fwnode) / div->divider;
 	return (int)div->fdr;
 }
 

drivers/net/can/mscan/mpc5xxx_can.c

@@ -63,7 +63,7 @@ static u32 mpc52xx_can_get_clock(struct platform_device *ofdev,
 	else
 		*mscan_clksrc = MSCAN_CLKSRC_XTAL;
 
-	freq = mpc5xxx_get_bus_frequency(ofdev->dev.of_node);
+	freq = mpc5xxx_get_bus_frequency(&ofdev->dev);
 	if (!freq)
 		return 0;
 

drivers/net/ethernet/freescale/fec_mpc52xx.c

@@ -924,7 +924,7 @@ static int mpc52xx_fec_probe(struct platform_device *op)
 	/* Start with safe defaults for link connection */
 	priv->speed = 100;
 	priv->duplex = DUPLEX_HALF;
-	priv->mdio_speed = ((mpc5xxx_get_bus_frequency(np) >> 20) / 5) << 1;
+	priv->mdio_speed = ((mpc5xxx_get_bus_frequency(&op->dev) >> 20) / 5) << 1;
 
 	/* The current speed preconfigures the speed of the MII link */
 	prop = of_get_property(np, "current-speed", &prop_size);

drivers/net/ethernet/freescale/fec_mpc52xx_phy.c

@@ -100,8 +100,7 @@ static int mpc52xx_fec_mdio_probe(struct platform_device *of)
 	dev_set_drvdata(dev, bus);
 
 	/* set MII speed */
-	out_be32(&priv->regs->mii_speed,
-		((mpc5xxx_get_bus_frequency(of->dev.of_node) >> 20) / 5) << 1);
+	out_be32(&priv->regs->mii_speed, ((mpc5xxx_get_bus_frequency(dev) >> 20) / 5) << 1);
 
 	err = of_mdiobus_register(bus, np);
 	if (err)

drivers/net/ethernet/freescale/fs_enet/mii-fec.c

@@ -102,7 +102,7 @@ static int fs_enet_mdio_probe(struct platform_device *ofdev)
 	struct resource res;
 	struct mii_bus *new_bus;
 	struct fec_info *fec;
-	int (*get_bus_freq)(struct device_node *);
+	int (*get_bus_freq)(struct device *);
 	int ret = -ENOMEM, clock, speed;
 
 	match = of_match_device(fs_enet_mdio_fec_match, &ofdev->dev);
@@ -136,7 +136,7 @@ static int fs_enet_mdio_probe(struct platform_device *ofdev)
 	}
 
 	if (get_bus_freq) {
-		clock = get_bus_freq(ofdev->dev.of_node);
+		clock = get_bus_freq(&ofdev->dev);
 		if (!clock) {
 			/* Use maximum divider if clock is unknown */
 			dev_warn(&ofdev->dev, "could not determine IPS clock\n");

drivers/spi/spi-mpc52xx.c

@@ -437,7 +437,7 @@ static int mpc52xx_spi_probe(struct platform_device *op)
 	ms->irq0 = irq_of_parse_and_map(op->dev.of_node, 0);
 	ms->irq1 = irq_of_parse_and_map(op->dev.of_node, 1);
 	ms->state = mpc52xx_spi_fsmstate_idle;
-	ms->ipb_freq = mpc5xxx_get_bus_frequency(op->dev.of_node);
+	ms->ipb_freq = mpc5xxx_get_bus_frequency(&op->dev);
 	ms->gpio_cs_count = of_gpio_count(op->dev.of_node);
 	if (ms->gpio_cs_count > 0) {
 		master->num_chipselect = ms->gpio_cs_count;

drivers/tty/serial/mpc52xx_uart.c

@@ -1630,7 +1630,7 @@ mpc52xx_console_setup(struct console *co, char *options)
 		return ret;
 	}
 
-	uartclk = mpc5xxx_get_bus_frequency(np);
+	uartclk = mpc5xxx_fwnode_get_bus_frequency(of_fwnode_handle(np));
 	if (uartclk == 0) {
 		pr_debug("Could not find uart clock frequency!\n");
 		return -EINVAL;
@@ -1747,7 +1747,7 @@ static int mpc52xx_uart_of_probe(struct platform_device *op)
 	/* set the uart clock to the input clock of the psc, the different
 	 * prescalers are taken into account in the set_baudrate() methods
 	 * of the respective chip */
-	uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
+	uartclk = mpc5xxx_get_bus_frequency(&op->dev);
 	if (uartclk == 0) {
 		dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
 		return -EINVAL;