net: lan969x: fix cyclic dependency reported by depmod

Depmod reports a cyclic dependency between modules sparx5-switch.ko and
lan969x-switch.ko:

depmod: ERROR: Cycle detected: lan969x_switch -> sparx5_switch -> lan969x_switch
depmod: ERROR: Found 2 modules in dependency cycles!
make[2]: *** [scripts/Makefile.modinst:132: depmod] Error 1
make: *** [Makefile:224: __sub-make] Error 2

This makes sense, as they both require symbols from each other.

Fix this by compiling lan969x support into the sparx5-switch.ko module.
In order to do this, in a sensible way, we move the lan969x/ dir into
the sparx5/ dir and do some code cleanup of code that is no longer
required.

After this patch, depmod will no longer complain, as lan969x support is
compiled into the sparx5-swicth.ko module, and can no longer be compiled
as a standalone module.

Fixes: 98a01119608d ("net: sparx5: add compatible string for lan969x")
Signed-off-by: Daniel Machon <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

MAINTAINERS

···
 M:	[e-mail]
 L:	[e-mail]
 S:	Maintained
-F:	drivers/net/ethernet/microchip/lan969x/*
+F:	drivers/net/ethernet/microchip/sparx5/lan969x/*
 
 MICROCHIP LCDFB DRIVER
 M:	Nicolas Ferre <[e-mail]>

drivers/net/ethernet/microchip/Kconfig

···
 
 source "drivers/net/ethernet/microchip/lan865x/Kconfig"
 source "drivers/net/ethernet/microchip/lan966x/Kconfig"
-source "drivers/net/ethernet/microchip/lan969x/Kconfig"
 source "drivers/net/ethernet/microchip/sparx5/Kconfig"
 source "drivers/net/ethernet/microchip/vcap/Kconfig"
 source "drivers/net/ethernet/microchip/fdma/Kconfig"

drivers/net/ethernet/microchip/Makefile

···
 
 obj-$(CONFIG_LAN865X) += lan865x/
 obj-$(CONFIG_LAN966X_SWITCH) += lan966x/
-obj-$(CONFIG_LAN969X_SWITCH) += lan969x/
 obj-$(CONFIG_SPARX5_SWITCH) += sparx5/
 obj-$(CONFIG_VCAP) += vcap/
 obj-$(CONFIG_FDMA) += fdma/

drivers/net/ethernet/microchip/lan969x/Kconfig

···
-config LAN969X_SWITCH
-	bool "Lan969x switch driver"
-	depends on SPARX5_SWITCH
-	help
-	  This driver supports the lan969x family of network switch devices.

drivers/net/ethernet/microchip/lan969x/Makefile

···
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# Makefile for the Microchip lan969x network device drivers.
-#
-
-obj-$(CONFIG_SPARX5_SWITCH) += lan969x-switch.o
-
-lan969x-switch-y := lan969x_regs.o lan969x.o lan969x_calendar.o \
- lan969x_vcap_ag_api.o lan969x_vcap_impl.o
-
-# Provide include files
-ccflags-y += -I$(srctree)/drivers/net/ethernet/microchip/fdma
-ccflags-y += -I$(srctree)/drivers/net/ethernet/microchip/vcap

drivers/net/ethernet/microchip/lan969x/lan969x.c drivers/net/ethernet/microchip/sparx5/lan969x/lan969x.c

···
 	.consts     = &lan969x_consts,
 	.ops        = &lan969x_ops,
 };
-EXPORT_SYMBOL_GPL(lan969x_desc);
-
-MODULE_DESCRIPTION("Microchip lan969x switch driver");
-MODULE_AUTHOR("Daniel Machon <[e-mail]>");
-MODULE_LICENSE("Dual MIT/GPL");

drivers/net/ethernet/microchip/sparx5/Kconfig

···
 	  DSCP and PCP.
 
 	  If unsure, set to Y.
+
+config LAN969X_SWITCH
+	bool "Lan969x switch driver"
+	depends on SPARX5_SWITCH
+	help
+	  This driver supports the lan969x family of network switch devices.

drivers/net/ethernet/microchip/sparx5/Makefile

···
 sparx5-switch-$(CONFIG_SPARX5_DCB) += sparx5_dcb.o
 sparx5-switch-$(CONFIG_DEBUG_FS) += sparx5_vcap_debugfs.o
 
+sparx5-switch-$(CONFIG_LAN969X_SWITCH) += lan969x/lan969x_regs.o \
+					  lan969x/lan969x.o \
+					  lan969x/lan969x_calendar.o \
+					  lan969x/lan969x_vcap_ag_api.o \
+					  lan969x/lan969x_vcap_impl.o
+
 # Provide include files
 ccflags-y += -I$(srctree)/drivers/net/ethernet/microchip/vcap
 ccflags-y += -I$(srctree)/drivers/net/ethernet/microchip/fdma

drivers/net/ethernet/microchip/sparx5/sparx5_calendar.c

···
 	default: return 0;
 	}
 }
-EXPORT_SYMBOL_GPL(sparx5_cal_speed_to_value);
 
 static u32 sparx5_bandwidth_to_calendar(u32 bw)
 {
···
 		return SPX5_CAL_SPEED_NONE;
 	return sparx5_bandwidth_to_calendar(port->conf.bandwidth);
 }
-EXPORT_SYMBOL_GPL(sparx5_get_port_cal_speed);
 
 /* Auto configure the QSYS calendar based on port configuration */
 int sparx5_config_auto_calendar(struct sparx5 *sparx5)

drivers/net/ethernet/microchip/sparx5/sparx5_main.c

···
 #include <linux/types.h>
 #include <linux/reset.h>
 
-#include "../lan969x/lan969x.h" /* for lan969x match data */
+#include "lan969x/lan969x.h" /* for lan969x match data */
 
 #include "sparx5_main_regs.h"
 #include "sparx5_main.h"
···
 
 static const struct of_device_id mchp_sparx5_match[] = {
 	{ .compatible = "microchip,sparx5-switch", .data = &sparx5_desc },
-#if IS_ENABLED(CONFIG_LAN969X_SWITCH)
+#ifdef CONFIG_LAN969X_SWITCH
 	{ .compatible = "microchip,lan9691-switch", .data = &lan969x_desc },
 #endif
 	{ }

drivers/net/ethernet/microchip/sparx5/sparx5_ptp.c

···
 
 	spin_unlock_irqrestore(&sparx5->ptp_clock_lock, flags);
 }
-EXPORT_SYMBOL_GPL(sparx5_get_hwtimestamp);
 
 irqreturn_t sparx5_ptp_irq_handler(int irq, void *args)
 {