net: mscc: ocelot: convert MSCC_OCELOT_SWITCH into a library

Hide the CONFIG_MSCC_OCELOT_SWITCH option from users. It is meant to be
only a hardware library which is selected by the drivers that use it
(ocelot, felix).

Since it is "selected" from Kconfig, all its dependencies are manually
transferred to the driver that selects it. This is because "select" in
Kconfig language is a bit of a mess, and doesn't handle dependencies of
selected options quite right.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/ocelot/Kconfig

@@ -4,7 +4,9 @@ config NET_DSA_MSCC_FELIX
 	depends on NET_DSA && PCI
 	depends on NET_VENDOR_MICROSEMI
 	depends on NET_VENDOR_FREESCALE
-	select MSCC_OCELOT_SWITCH
+	depends on HAS_IOMEM
+	depends on REGMAP_MMIO
+	select MSCC_OCELOT_SWITCH_LIB
 	select NET_DSA_TAG_OCELOT
 	select FSL_ENETC_MDIO
 	help

drivers/net/ethernet/mscc/Kconfig

@@ -11,20 +11,22 @@ config NET_VENDOR_MICROSEMI
 
 if NET_VENDOR_MICROSEMI
 
-config MSCC_OCELOT_SWITCH
-	tristate "Ocelot switch driver"
-	depends on NET_SWITCHDEV
-	depends on HAS_IOMEM
-	select PHYLIB
-	select REGMAP_MMIO
+# Users should depend on NET_SWITCHDEV, HAS_IOMEM, PHYLIB and REGMAP_MMIO
+config MSCC_OCELOT_SWITCH_LIB
+	tristate
 	help
-	  This driver supports the Ocelot network switch device.
+	  This is a hardware support library for Ocelot network switches. It is
+	  used by switchdev as well as by DSA drivers.
 
 config MSCC_OCELOT_SWITCH_OCELOT
 	tristate "Ocelot switch driver on Ocelot"
-	depends on MSCC_OCELOT_SWITCH
+	depends on NET_SWITCHDEV
 	depends on GENERIC_PHY
+	depends on REGMAP_MMIO
+	depends on HAS_IOMEM
+	depends on PHYLIB
 	depends on OF_NET
+	select MSCC_OCELOT_SWITCH_LIB
 	help
 	  This driver supports the Ocelot network switch device as present on
 	  the Ocelot SoCs.

drivers/net/ethernet/mscc/Makefile

 # SPDX-License-Identifier: (GPL-2.0 OR MIT)
-obj-$(CONFIG_MSCC_OCELOT_SWITCH) += mscc_ocelot_common.o
-mscc_ocelot_common-y := ocelot.o ocelot_io.o
-mscc_ocelot_common-y += ocelot_regs.o ocelot_tc.o ocelot_police.o ocelot_ace.o ocelot_flower.o ocelot_ptp.o
+obj-$(CONFIG_MSCC_OCELOT_SWITCH_LIB) += mscc_ocelot_switch_lib.o
+mscc_ocelot_switch_lib-y := \
+	ocelot.o \
+	ocelot_io.o \
+	ocelot_regs.o \
+	ocelot_tc.o \
+	ocelot_police.o \
+	ocelot_ace.o \
+	ocelot_flower.o \
+	ocelot_ptp.o
 obj-$(CONFIG_MSCC_OCELOT_SWITCH_OCELOT) += mscc_ocelot.o
 mscc_ocelot-y := ocelot_vsc7514.o