[PATCH v2 09/10] of: mdio: provide devm_of_mdiobus_register()

Bartosz Golaszewski
2020-06-29T21:03:36Z

Implement a managed variant of of_mdiobus_register(). We need to make
mdio_devres into its own module because otherwise we'd hit circular
sumbol dependencies between phylib and of_mdio.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
.../driver-api/driver-model/devres.rst | 1 +
drivers/net/phy/Makefile | 4 +-
drivers/net/phy/mdio_devres.c | 37 +++++++++++++++++++
include/linux/of_mdio.h | 3 ++
4 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index e0333d66a7f4..eaaaafc21134 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -343,6 +343,7 @@ MDIO
devm_mdiobus_alloc()
devm_mdiobus_alloc_size()
devm_mdiobus_register()
+ devm_of_mdiobus_register()

MEM
devm_free_pages()
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 896afdcac437..c9a9adf194d5 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -3,7 +3,8 @@

libphy-y := phy.o phy-c45.o phy-core.o phy_device.o \
linkmode.o
-mdio-bus-y += mdio_bus.o mdio_device.o mdio_devres.o
+mdio-bus-y += mdio_bus.o mdio_device.o
+mdio-devres-y += mdio_devres.o

ifdef CONFIG_MDIO_DEVICE
obj-y += mdio-boardinfo.o
@@ -17,6 +18,7 @@ libphy-y += $(mdio-bus-y)
else
obj-$(CONFIG_MDIO_DEVICE) += mdio-bus.o
endif
+obj-$(CONFIG_MDIO_DEVICE) += mdio-devres.o
libphy-$(CONFIG_SWPHY) += swphy.o
libphy-$(CONFIG_LED_TRIGGER_PHY) += phy_led_triggers.o

diff --git a/drivers/net/phy/mdio_devres.c b/drivers/net/phy/mdio_devres.c
index 0b9bd9a61378..b560e99695df 100644
--- a/drivers/net/phy/mdio_devres.c
+++ b/drivers/net/phy/mdio_devres.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-or-later

#include <linux/device.h>
+#include <linux/of_mdio.h>
#include <linux/phy.h>
#include <linux/stddef.h>

@@ -94,3 +95,39 @@ int __devm_mdiobus_register(struct device *dev, struct mii_bus *bus,
return 0;
}
EXPORT_SYMBOL(__devm_mdiobus_register);
+
+#if IS_ENABLED(CONFIG_OF_MDIO)
+/**
+ * devm_of_mdiobus_register - Resource managed variant of of_mdiobus_register()
+ * @dev: Device to register mii_bus for
+ * @mdio: MII bus structure to register
+ * @np: Device node to parse
+ */
+int devm_of_mdiobus_register(struct device *dev, struct mii_bus *mdio,
+ struct device_node *np)
+{
+ struct mdiobus_devres *dr;
+ int ret;
+
+ if (WARN_ON(!devres_find(dev, devm_mdiobus_free,
+ mdiobus_devres_match, mdio)))
+ return -EINVAL;
+
+ dr = devres_alloc(devm_mdiobus_unregister, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ ret = of_mdiobus_register(mdio, np);
+ if (ret) {
+ devres_free(dr);
+ return ret;
+ }
+
+ dr->mii = mdio;
+ devres_add(dev, dr);
+ return 0;
+}
+EXPORT_SYMBOL(devm_of_mdiobus_register);
+#endif /* CONFIG_OF_MDIO */
+
+MODULE_LICENSE("GPL");
diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
index ba8e157f24ad..1efb88d9f892 100644
--- a/include/linux/of_mdio.h
+++ b/include/linux/of_mdio.h
@@ -8,12 +8,15 @@
#ifndef __LINUX_OF_MDIO_H
#define __LINUX_OF_MDIO_H

+#include <linux/device.h>
#include <linux/phy.h>
#include <linux/of.h>

#if IS_ENABLED(CONFIG_OF_MDIO)
bool of_mdiobus_child_is_phy(struct device_node *child);
int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np);
+int devm_of_mdiobus_register(struct device *dev, struct mii_bus *mdio,
+ struct device_node *np);
struct phy_device *of_phy_find_device(struct device_node *phy_np);
struct phy_device *
of_phy_connect(struct net_device *dev, struct device_node *phy_np,
--
2.26.1