[PATCH v1 2/4] powerpc/mpc5xxx: Switch mpc5xxx_get_bus_frequency() to use fwnode

Andy Shevchenko
2022-05-04T13:56:01Z

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>
---
arch/powerpc/include/asm/mpc5xxx.h | 9 +++-
arch/powerpc/platforms/52xx/mpc52xx_gpt.c | 2 +-
arch/powerpc/sysdev/mpc5xxx_clocks.c | 41 ++++++++++---------
drivers/ata/pata_mpc52xx.c | 2 +-
drivers/i2c/busses/i2c-mpc.c | 7 ++--
drivers/net/can/mscan/mpc5xxx_can.c | 2 +-
drivers/net/ethernet/freescale/fec_mpc52xx.c | 2 +-
.../net/ethernet/freescale/fec_mpc52xx_phy.c | 3 +-
.../net/ethernet/freescale/fs_enet/mii-fec.c | 4 +-
drivers/spi/spi-mpc52xx.c | 2 +-
drivers/tty/serial/mpc52xx_uart.c | 4 +-
11 files changed, 44 insertions(+), 34 deletions(-)

diff --git a/arch/powerpc/include/asm/mpc5xxx.h b/arch/powerpc/include/asm/mpc5xxx.h
index 2f60f5c5461b..44db26380435 100644
--- a/arch/powerpc/include/asm/mpc5xxx.h
+++ b/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__ */

diff --git a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
index f862b48b4824..8f896a42d7d8 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
@@ -720,7 +720,7 @@ 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;
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);
diff --git a/drivers/ata/pata_mpc52xx.c b/drivers/ata/pata_mpc52xx.c
index 03b6ae37a578..6559b606736d 100644
--- a/drivers/ata/pata_mpc52xx.c
+++ b/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;
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index 6c698c10d3cd..2030668ecde5 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/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 = 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;
}

diff --git a/drivers/net/can/mscan/mpc5xxx_can.c b/drivers/net/can/mscan/mpc5xxx_can.c
index 65ba6697bd7d..c469b2f3e57d 100644
--- a/drivers/net/can/mscan/mpc5xxx_can.c
+++ b/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;

diff --git a/drivers/net/ethernet/freescale/fec_mpc52xx.c b/drivers/net/ethernet/freescale/fec_mpc52xx.c
index be0bd4b44926..159d59147827 100644
--- a/drivers/net/ethernet/freescale/fec_mpc52xx.c
+++ b/drivers/net/ethernet/freescale/fec_mpc52xx.c
@@ -922,7 +922,7 @@ 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);
diff --git a/drivers/net/ethernet/freescale/fec_mpc52xx_phy.c b/drivers/net/ethernet/freescale/fec_mpc52xx_phy.c
index b5497e308302..3c9b1fae956b 100644
--- a/drivers/net/ethernet/freescale/fec_mpc52xx_phy.c
+++ b/drivers/net/ethernet/freescale/fec_mpc52xx_phy.c
@@ -99,8 +99,7 @@ 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)
diff --git a/drivers/net/ethernet/freescale/fs_enet/mii-fec.c b/drivers/net/ethernet/freescale/fs_enet/mii-fec.c
index 152f4d83765a..d37d7a19a759 100644
--- a/drivers/net/ethernet/freescale/fs_enet/mii-fec.c
+++ b/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");
diff --git a/drivers/spi/spi-mpc52xx.c b/drivers/spi/spi-mpc52xx.c
index 3ebdce804b90..bc5e36fd4288 100644
--- a/drivers/spi/spi-mpc52xx.c
+++ b/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;
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
index e50f069b5ebb..3f1986c89694 100644
--- a/drivers/tty/serial/mpc52xx_uart.c
+++ b/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;
--
2.35.1