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mdio: mux: Enhanced MDIO mux framework for integrated multiplexers

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An integrated multiplexer uses same address space for
"muxed bus selection" and "generation of mdio transaction"
hence its good to register parent bus from mux driver.

Hence added a mechanism where mux driver could register a
parent bus and pass it down to framework via mdio_mux_init api.

Signed-off-by: Pramod Kumar <pramod.kumar@broadcom.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pramod Kumar 2016-06-10 11:03:45 +05:30 committed by David S. Miller
parent d46e416c11
commit f20e6657a8
4 changed files with 23 additions and 13 deletions
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2
drivers/net/phy/mdio-mux-gpio.c
View File

@ -55,7 +55,7 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev)
return PTR_ERR(s->gpios);
r = mdio_mux_init(&pdev->dev,
mdio_mux_gpio_switch_fn, &s->mux_handle, s);
mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL);
if (r != 0) {
gpiod_put_array(s->gpios);

2
drivers/net/phy/mdio-mux-mmioreg.c
View File

@ -126,7 +126,7 @@ static int mdio_mux_mmioreg_probe(struct platform_device *pdev)
}
ret = mdio_mux_init(&pdev->dev, mdio_mux_mmioreg_switch_fn,
&s->mux_handle, s);
&s->mux_handle, s, NULL);
if (ret) {
dev_err(&pdev->dev, "failed to register mdio-mux bus %s\n",
np->full_name);

28
drivers/net/phy/mdio-mux.c
View File

@ -89,7 +89,8 @@ static int parent_count;
int mdio_mux_init(struct device *dev,
int (*switch_fn)(int cur, int desired, void *data),
void **mux_handle,
void *data)
void *data,
struct mii_bus *mux_bus)
{
struct device_node *parent_bus_node;
struct device_node *child_bus_node;
@ -101,10 +102,21 @@ int mdio_mux_init(struct device *dev,
if (!dev->of_node)
return -ENODEV;
parent_bus_node = of_parse_phandle(dev->of_node, "mdio-parent-bus", 0);
if (!mux_bus) {
parent_bus_node = of_parse_phandle(dev->of_node,
"mdio-parent-bus", 0);
if (!parent_bus_node)
return -ENODEV;
if (!parent_bus_node)
return -ENODEV;
parent_bus = of_mdio_find_bus(parent_bus_node);
if (!parent_bus) {
ret_val = -EPROBE_DEFER;
goto err_parent_bus;
}
} else {
parent_bus = mux_bus;
}
pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL);
if (pb == NULL) {
@ -112,11 +124,6 @@ int mdio_mux_init(struct device *dev,
goto err_parent_bus;
}
parent_bus = of_mdio_find_bus(parent_bus_node);
if (parent_bus == NULL) {
ret_val = -EPROBE_DEFER;
goto err_parent_bus;
}
pb->switch_data = data;
pb->switch_fn = switch_fn;
@ -177,7 +184,8 @@ int mdio_mux_init(struct device *dev,
put_device(&pb->mii_bus->dev);
err_parent_bus:
of_node_put(parent_bus_node);
if (!mux_bus)
of_node_put(parent_bus_node);
return ret_val;
}
EXPORT_SYMBOL_GPL(mdio_mux_init);

4
include/linux/mdio-mux.h
View File

@ -10,11 +10,13 @@
#ifndef __LINUX_MDIO_MUX_H
#define __LINUX_MDIO_MUX_H
#include <linux/device.h>
#include <linux/phy.h>
int mdio_mux_init(struct device *dev,
int (*switch_fn) (int cur, int desired, void *data),
void **mux_handle,
void *data);
void *data,
struct mii_bus *mux_bus);
void mdio_mux_uninit(void *mux_handle);