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Subject[PATCH net-next v2 09/10] net: phy: Allow pre-declaration of MDIO devices
Date
Allow board support code to collect pre-declarations for MDIO devices by
registering them with mdiobus_register_board_info(). SPI and I2C buses
have a similar feature, we were missing this for MDIO devices, but this
is particularly useful for e.g: MDIO-connected switches which need to
provide their port layout (often board-specific) to a MDIO Ethernet
switch driver.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/net/phy/Makefile | 3 +-
drivers/net/phy/mdio-boardinfo.c | 86 ++++++++++++++++++++++++++++++++++++++++
drivers/net/phy/mdio-boardinfo.h | 19 +++++++++
drivers/net/phy/mdio_bus.c | 5 +++
drivers/net/phy/mdio_device.c | 11 +++++
include/linux/mdio.h | 3 ++
include/linux/mod_devicetable.h | 1 +
include/linux/phy.h | 19 +++++++++
8 files changed, 146 insertions(+), 1 deletion(-)
create mode 100644 drivers/net/phy/mdio-boardinfo.c
create mode 100644 drivers/net/phy/mdio-boardinfo.h

diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 356859ac7c18..407b0b601ea8 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -1,6 +1,7 @@
# Makefile for Linux PHY drivers and MDIO bus drivers

-libphy-y := phy.o phy_device.o mdio_bus.o mdio_device.o
+libphy-y := phy.o phy_device.o mdio_bus.o mdio_device.o \
+ mdio-boardinfo.o
libphy-$(CONFIG_SWPHY) += swphy.o
libphy-$(CONFIG_LED_TRIGGER_PHY) += phy_led_triggers.o

diff --git a/drivers/net/phy/mdio-boardinfo.c b/drivers/net/phy/mdio-boardinfo.c
new file mode 100644
index 000000000000..230b40ffee5a
--- /dev/null
+++ b/drivers/net/phy/mdio-boardinfo.c
@@ -0,0 +1,86 @@
+/*
+ * mdio-boardinfo - Collect pre-declarations for MDIO devices
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+
+#include "mdio-boardinfo.h"
+
+static LIST_HEAD(mdio_board_list);
+static DEFINE_MUTEX(mdio_board_lock);
+
+/**
+ * mdiobus_setup_mdiodev_from_board_info - create and setup MDIO devices
+ * from pre-collected board specific MDIO information
+ * @mdiodev: MDIO device pointer
+ * Context: can sleep
+ */
+void mdiobus_setup_mdiodev_from_board_info(struct mii_bus *bus)
+{
+ struct mdio_board_entry *be;
+ struct mdio_device *mdiodev;
+ struct mdio_board_info *bi;
+ int ret;
+
+ mutex_lock(&mdio_board_lock);
+ list_for_each_entry(be, &mdio_board_list, list) {
+ bi = &be->board_info;
+
+ if (strcmp(bus->id, bi->bus_id))
+ continue;
+
+ mdiodev = mdio_device_create(bus, bi->mdio_addr) ;
+ if (IS_ERR(mdiodev))
+ continue;
+
+ strncpy(mdiodev->modalias, bi->modalias,
+ sizeof(mdiodev->modalias));
+ mdiodev->bus_match = mdio_device_bus_match;
+ mdiodev->dev.platform_data = (void *)bi->platform_data;
+
+ ret = mdio_device_register(mdiodev);
+ if (ret) {
+ mdio_device_free(mdiodev);
+ continue;
+ }
+ }
+ mutex_unlock(&mdio_board_lock);
+}
+
+/**
+ * mdio_register_board_info - register MDIO devices for a given board
+ * @info: array of devices descriptors
+ * @n: number of descriptors provided
+ * Context: can sleep
+ *
+ * The board info passed can be marked with __initdata but be pointers
+ * such as platform_data etc. are copied as-is
+ */
+int mdiobus_register_board_info(const struct mdio_board_info *info,
+ unsigned int n)
+{
+ struct mdio_board_entry *be;
+ unsigned int i;
+
+ be = kcalloc(n, sizeof(*be), GFP_KERNEL);
+ if (!be)
+ return -ENOMEM;
+
+ for (i = 0; i < n; i++, be++, info++) {
+ memcpy(&be->board_info, info, sizeof(*info));
+ mutex_lock(&mdio_board_lock);
+ list_add_tail(&be->list, &mdio_board_list);
+ mutex_unlock(&mdio_board_lock);
+ }
+
+ return 0;
+}
diff --git a/drivers/net/phy/mdio-boardinfo.h b/drivers/net/phy/mdio-boardinfo.h
new file mode 100644
index 000000000000..00f98163e90e
--- /dev/null
+++ b/drivers/net/phy/mdio-boardinfo.h
@@ -0,0 +1,19 @@
+/*
+ * mdio-boardinfo.h - board info interface internal to the mdio_bus
+ * component
+ */
+
+#ifndef __MDIO_BOARD_INFO_H
+#define __MDIO_BOARD_INFO_H
+
+#include <linux/phy.h>
+#include <linux/mutex.h>
+
+struct mdio_board_entry {
+ struct list_head list;
+ struct mdio_board_info board_info;
+};
+
+void mdiobus_setup_mdiodev_from_board_info(struct mii_bus *bus);
+
+#endif /* __MDIO_BOARD_INFO_H */
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 653d076eafe5..976cb9c4ab01 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -41,6 +41,8 @@
#define CREATE_TRACE_POINTS
#include <trace/events/mdio.h>

+#include "mdio-boardinfo.h"
+
int mdiobus_register_device(struct mdio_device *mdiodev)
{
if (mdiodev->bus->mdio_map[mdiodev->addr])
@@ -343,7 +345,10 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
}
}

+ mdiobus_setup_mdiodev_from_board_info(bus);
+
bus->state = MDIOBUS_REGISTERED;
+
pr_info("%s: probed\n", bus->name);
return 0;

diff --git a/drivers/net/phy/mdio_device.c b/drivers/net/phy/mdio_device.c
index fc3aaaa36b1d..e24f28924af8 100644
--- a/drivers/net/phy/mdio_device.c
+++ b/drivers/net/phy/mdio_device.c
@@ -34,6 +34,17 @@ static void mdio_device_release(struct device *dev)
kfree(to_mdio_device(dev));
}

+int mdio_device_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct mdio_device *mdiodev = to_mdio_device(dev);
+ struct mdio_driver *mdiodrv = to_mdio_driver(drv);
+
+ if (mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY)
+ return 0;
+
+ return strcmp(mdiodev->modalias, drv->name) == 0;
+}
+
struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr)
{
struct mdio_device *mdiodev;
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index b6587a4b32e7..00a7f43c1482 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -10,6 +10,7 @@
#define __LINUX_MDIO_H__

#include <uapi/linux/mdio.h>
+#include <linux/mod_devicetable.h>

struct mii_bus;

@@ -29,6 +30,7 @@ struct mdio_device {

const struct dev_pm_ops *pm_ops;
struct mii_bus *bus;
+ char modalias[MDIO_NAME_SIZE];

int (*bus_match)(struct device *dev, struct device_driver *drv);
void (*device_free)(struct mdio_device *mdiodev);
@@ -71,6 +73,7 @@ int mdio_device_register(struct mdio_device *mdiodev);
void mdio_device_remove(struct mdio_device *mdiodev);
int mdio_driver_register(struct mdio_driver *drv);
void mdio_driver_unregister(struct mdio_driver *drv);
+int mdio_device_bus_match(struct device *dev, struct device_driver *drv);

static inline bool mdio_phy_id_is_c45(int phy_id)
{
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 8a57f0b1242d..8850fcaf50db 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -501,6 +501,7 @@ struct platform_device_id {
kernel_ulong_t driver_data;
};

+#define MDIO_NAME_SIZE 32
#define MDIO_MODULE_PREFIX "mdio:"

#define MDIO_ID_FMT "%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d"
diff --git a/include/linux/phy.h b/include/linux/phy.h
index f7d95f644eed..7745f7391d3e 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -882,6 +882,25 @@ void mdio_bus_exit(void);

extern struct bus_type mdio_bus_type;

+struct mdio_board_info {
+ const char *bus_id;
+ char modalias[MDIO_NAME_SIZE];
+ int mdio_addr;
+ const void *platform_data;
+};
+
+#if IS_ENABLED(CONFIG_PHYLIB)
+int mdiobus_register_board_info(const struct mdio_board_info *info,
+ unsigned int n);
+#else
+static inline int mdiobus_register_board_info(const struct mdio_board_info *i,
+ unsigned int n)
+{
+ return 0;
+}
+#endif
+
+
/**
* module_phy_driver() - Helper macro for registering PHY drivers
* @__phy_drivers: array of PHY drivers to register
--
2.9.3
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