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Date: Thu, 2 Nov 2023 17:55:21 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Luiz Angelo Daros de Luca <luizluca@...il.com>, netdev@...r.kernel.org,
alsi@...g-olufsen.dk, andrew@...n.ch, vivien.didelot@...il.com,
f.fainelli@...il.com, davem@...emloft.net, kuba@...nel.org,
pabeni@...hat.com, robh+dt@...nel.org, krzk+dt@...nel.org,
arinc.unal@...nc9.com
Subject: Re: [PATCH net-next v2 3/3] net: dsa: realtek: support reset
controller
On Thu, Nov 02, 2023 at 03:59:48PM +0100, Linus Walleij wrote:
> I don't know if this is an answer to your question, but look at what I did in
>
> drivers/usb/fotg210/Makefile:
>
> # This setup links the different object files into one single
> # module so we don't have to EXPORT() a lot of internal symbols
> # or create unnecessary submodules.
> fotg210-objs-y += fotg210-core.o
> fotg210-objs-$(CONFIG_USB_FOTG210_HCD) += fotg210-hcd.o
> fotg210-objs-$(CONFIG_USB_FOTG210_UDC) += fotg210-udc.o
> fotg210-objs := $(fotg210-objs-y)
> obj-$(CONFIG_USB_FOTG210) += fotg210.o
>
> Everything starting with CONFIG_* is a Kconfig option obviously.
>
> The final module is just one file named fotg210.ko no matter whether
> HCD (host controller), UDC (device controller) or both parts were
> compiled into it. Often you just need one of them, sometimes you may
> need both.
>
> It's a pretty clean example of how you do this "one module from
> several optional parts" using Kbuild.
To be clear, something like this is what you mean, right?
diff --git a/drivers/net/dsa/realtek/Kconfig b/drivers/net/dsa/realtek/Kconfig
index 060165a85fb7..857a039fb0f1 100644
--- a/drivers/net/dsa/realtek/Kconfig
+++ b/drivers/net/dsa/realtek/Kconfig
@@ -15,39 +15,37 @@ menuconfig NET_DSA_REALTEK
if NET_DSA_REALTEK
+config NET_DSA_REALTEK_INTERFACE
+ tristate
+ help
+ Common interface driver for accessing Realtek switches, either
+ through MDIO or SMI.
+
config NET_DSA_REALTEK_MDIO
- tristate "Realtek MDIO interface driver"
- depends on OF
- depends on NET_DSA_REALTEK_RTL8365MB || NET_DSA_REALTEK_RTL8366RB
- depends on NET_DSA_REALTEK_RTL8365MB || !NET_DSA_REALTEK_RTL8365MB
- depends on NET_DSA_REALTEK_RTL8366RB || !NET_DSA_REALTEK_RTL8366RB
+ tristate "Realtek MDIO interface support"
help
Select to enable support for registering switches configured
through MDIO.
config NET_DSA_REALTEK_SMI
- tristate "Realtek SMI interface driver"
- depends on OF
- depends on NET_DSA_REALTEK_RTL8365MB || NET_DSA_REALTEK_RTL8366RB
- depends on NET_DSA_REALTEK_RTL8365MB || !NET_DSA_REALTEK_RTL8365MB
- depends on NET_DSA_REALTEK_RTL8366RB || !NET_DSA_REALTEK_RTL8366RB
+ bool "Realtek SMI interface support"
help
Select to enable support for registering switches connected
through SMI.
config NET_DSA_REALTEK_RTL8365MB
tristate "Realtek RTL8365MB switch subdriver"
- imply NET_DSA_REALTEK_SMI
- imply NET_DSA_REALTEK_MDIO
+ select NET_DSA_REALTEK_INTERFACE
select NET_DSA_TAG_RTL8_4
+ depends on OF
help
Select to enable support for Realtek RTL8365MB-VC and RTL8367S.
config NET_DSA_REALTEK_RTL8366RB
tristate "Realtek RTL8366RB switch subdriver"
- imply NET_DSA_REALTEK_SMI
- imply NET_DSA_REALTEK_MDIO
+ select NET_DSA_REALTEK_INTERFACE
select NET_DSA_TAG_RTL4_A
+ depends on OF
help
Select to enable support for Realtek RTL8366RB.
diff --git a/drivers/net/dsa/realtek/Makefile b/drivers/net/dsa/realtek/Makefile
index 0aab57252a7c..35b7734c0ad0 100644
--- a/drivers/net/dsa/realtek/Makefile
+++ b/drivers/net/dsa/realtek/Makefile
@@ -1,6 +1,15 @@
# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_NET_DSA_REALTEK_MDIO) += realtek-mdio.o
-obj-$(CONFIG_NET_DSA_REALTEK_SMI) += realtek-smi.o
+
+obj-$(CONFIG_NET_DSA_REALTEK_INTERFACE) := realtek-interface.o
+
+realtek-interface-objs := realtek-interface-common.o
+ifdef CONFIG_NET_DSA_REALTEK_MDIO
+realtek-interface-objs += realtek-mdio.o
+endif
+ifdef CONFIG_NET_DSA_REALTEK_SMI
+realtek-interface-objs += realtek-smi.o
+endif
+
obj-$(CONFIG_NET_DSA_REALTEK_RTL8366RB) += rtl8366.o
rtl8366-objs := rtl8366-core.o rtl8366rb.o
obj-$(CONFIG_NET_DSA_REALTEK_RTL8365MB) += rtl8365mb.o
diff --git a/drivers/net/dsa/realtek/realtek-interface-common.c b/drivers/net/dsa/realtek/realtek-interface-common.c
new file mode 100644
index 000000000000..bb7c77cdb9e2
--- /dev/null
+++ b/drivers/net/dsa/realtek/realtek-interface-common.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/module.h>
+
+#include "realtek-mdio.h"
+#include "realtek-smi.h"
+
+static int __init realtek_interface_init(void)
+{
+ int err;
+
+ err = realtek_mdio_init();
+ if (err)
+ return err;
+
+ err = realtek_smi_init();
+ if (err) {
+ realtek_smi_exit();
+ return err;
+ }
+
+ return 0;
+}
+module_init(realtek_interface_init);
+
+static void __exit realtek_interface_exit(void)
+{
+ realtek_smi_exit();
+ realtek_mdio_exit();
+}
+module_exit(realtek_interface_exit);
+
+MODULE_AUTHOR("Luiz Angelo Daros de Luca <luizluca@...il.com>");
+MODULE_AUTHOR("Linus Walleij <linus.walleij@...aro.org>");
+MODULE_DESCRIPTION("Driver for interfacing with Realtek switches via MDIO or SMI");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/dsa/realtek/realtek-mdio.c b/drivers/net/dsa/realtek/realtek-mdio.c
index 292e6d087e8b..6997dec14de2 100644
--- a/drivers/net/dsa/realtek/realtek-mdio.c
+++ b/drivers/net/dsa/realtek/realtek-mdio.c
@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0+
-/* Realtek MDIO interface driver
+/* Realtek MDIO interface support
*
* ASICs we intend to support with this driver:
*
@@ -19,12 +19,12 @@
* Copyright (C) 2009-2010 Gabor Juhos <juhosg@...nwrt.org>
*/
-#include <linux/module.h>
#include <linux/of.h>
#include <linux/overflow.h>
#include <linux/regmap.h>
#include "realtek.h"
+#include "realtek-mdio.h"
/* Read/write via mdiobus */
#define REALTEK_MDIO_CTRL0_REG 31
@@ -283,8 +283,12 @@ static struct mdio_driver realtek_mdio_driver = {
.shutdown = realtek_mdio_shutdown,
};
-mdio_module_driver(realtek_mdio_driver);
+int realtek_mdio_init(void)
+{
+ return mdio_driver_register(&realtek_mdio_driver);
+}
-MODULE_AUTHOR("Luiz Angelo Daros de Luca <luizluca@...il.com>");
-MODULE_DESCRIPTION("Driver for Realtek ethernet switch connected via MDIO interface");
-MODULE_LICENSE("GPL");
+void realtek_mdio_exit(void)
+{
+ mdio_driver_unregister(&realtek_mdio_driver);
+}
diff --git a/drivers/net/dsa/realtek/realtek-mdio.h b/drivers/net/dsa/realtek/realtek-mdio.h
new file mode 100644
index 000000000000..941b4ef9d531
--- /dev/null
+++ b/drivers/net/dsa/realtek/realtek-mdio.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef _REALTEK_MDIO_H
+#define _REALTEK_MDIO_H
+
+#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_MDIO)
+
+int realtek_mdio_init(void);
+void realtek_mdio_exit(void);
+
+#else
+
+static inline int realtek_mdio_init(void)
+{
+ return 0;
+}
+
+static inline void realtek_mdio_exit(void)
+{
+}
+
+#endif
+
+#endif
diff --git a/drivers/net/dsa/realtek/realtek-smi.c b/drivers/net/dsa/realtek/realtek-smi.c
index 755546ed8db6..4c282bfc884d 100644
--- a/drivers/net/dsa/realtek/realtek-smi.c
+++ b/drivers/net/dsa/realtek/realtek-smi.c
@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0+
-/* Realtek Simple Management Interface (SMI) driver
+/* Realtek Simple Management Interface (SMI) interface
* It can be discussed how "simple" this interface is.
*
* The SMI protocol piggy-backs the MDIO MDC and MDIO signals levels
@@ -26,7 +26,6 @@
*/
#include <linux/kernel.h>
-#include <linux/module.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
@@ -40,6 +39,7 @@
#include <linux/if_bridge.h>
#include "realtek.h"
+#include "realtek-smi.h"
#define REALTEK_SMI_ACK_RETRY_COUNT 5
@@ -560,8 +560,13 @@ static struct platform_driver realtek_smi_driver = {
.remove_new = realtek_smi_remove,
.shutdown = realtek_smi_shutdown,
};
-module_platform_driver(realtek_smi_driver);
-MODULE_AUTHOR("Linus Walleij <linus.walleij@...aro.org>");
-MODULE_DESCRIPTION("Driver for Realtek ethernet switch connected via SMI interface");
-MODULE_LICENSE("GPL");
+int realtek_smi_init(void)
+{
+ return platform_driver_register(&realtek_smi_driver);
+}
+
+void realtek_smi_exit(void)
+{
+ platform_driver_unregister(&realtek_smi_driver);
+}
diff --git a/drivers/net/dsa/realtek/realtek-smi.h b/drivers/net/dsa/realtek/realtek-smi.h
new file mode 100644
index 000000000000..9a4838321f94
--- /dev/null
+++ b/drivers/net/dsa/realtek/realtek-smi.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef _REALTEK_SMI_H
+#define _REALTEK_SMI_H
+
+#if IS_ENABLED(CONFIG_NET_DSA_REALTEK_SMI)
+
+int realtek_smi_init(void);
+void realtek_smi_exit(void);
+
+#else
+
+static inline int realtek_smi_init(void)
+{
+ return 0;
+}
+
+static inline void realtek_smi_exit(void)
+{
+}
+
+#endif
+
+#endif
--
2.34.1
It looks pretty reasonable to me. More stuff could go into
realtek-interface-common.c, that could be called directly from
realtek-smi.c and realtek-mdio.c without exporting anything.
I've eliminated the possibility for the SMI and MDIO options to be
anything other than y or n, because only a single interface module
(the common one) exists, and the y/n/m quality of that is
implied/selected by the drivers which depend on it. I hope I wasn't too
trigger-happy with this.
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