i2c: Drop legacy muxing pseudo-drivers

The i2c-amd756-s4882 and i2c-nforce2-s4985 muxing pseudo-drivers were
written at a time when the i2c core did not support muxing. They are
essentially board-specific hacks. If we had to add support for these
boards today, we would implement it in a completely different way.

These Tyan server boards are 19 years old by now, so I very much doubt
any of these is still running today. So let's just drop this clumsy
code. If anyone really still needs this support and complains, I'll
rewrite it in a proper way on top of i2c-mux.

This also fixes the following warnings:
drivers/i2c/busses/i2c-amd756.c:286:20: warning: symbol 'amd756_smbus' was not declared. Should it be static?
drivers/i2c/busses/i2c-nforce2.c:123:20: warning: symbol 'nforce2_smbus' was not declared. Should it be static?

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Andi Shyti <andi.shyti@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Author: jdelvare

MAINTAINERS

@@ -10722,12 +10722,10 @@ F:	Documentation/i2c/busses/i2c-viapro.rst
 F:	drivers/i2c/busses/i2c-ali1535.c
 F:	drivers/i2c/busses/i2c-ali1563.c
 F:	drivers/i2c/busses/i2c-ali15x3.c
-F:	drivers/i2c/busses/i2c-amd756-s4882.c
 F:	drivers/i2c/busses/i2c-amd756.c
 F:	drivers/i2c/busses/i2c-amd8111.c
 F:	drivers/i2c/busses/i2c-i801.c
 F:	drivers/i2c/busses/i2c-isch.c
-F:	drivers/i2c/busses/i2c-nforce2-s4985.c
 F:	drivers/i2c/busses/i2c-nforce2.c
 F:	drivers/i2c/busses/i2c-piix4.*
 F:	drivers/i2c/busses/i2c-sis5595.c

drivers/i2c/busses/Kconfig

@@ -62,19 +62,6 @@ config I2C_AMD756
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-amd756.
 
-config I2C_AMD756_S4882
-	tristate "SMBus multiplexing on the Tyan S4882"
-	depends on I2C_AMD756 && X86
-	help
-	  Enabling this option will add specific SMBus support for the Tyan
-	  S4882 motherboard.  On this 4-CPU board, the SMBus is multiplexed
-	  over 8 different channels, where the various memory module EEPROMs
-	  and temperature sensors live.  Saying yes here will give you access
-	  to these in addition to the trunk.
-
-	  This driver can also be built as a module.  If so, the module
-	  will be called i2c-amd756-s4882.
-
 config I2C_AMD8111
 	tristate "AMD 8111"
 	depends on PCI && HAS_IOPORT
@@ -268,19 +255,6 @@ config I2C_NFORCE2
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-nforce2.
 
-config I2C_NFORCE2_S4985
-	tristate "SMBus multiplexing on the Tyan S4985"
-	depends on I2C_NFORCE2 && X86
-	help
-	  Enabling this option will add specific SMBus support for the Tyan
-	  S4985 motherboard.  On this 4-CPU board, the SMBus is multiplexed
-	  over 4 different channels, where the various memory module EEPROMs
-	  live.  Saying yes here will give you access to these in addition
-	  to the trunk.
-
-	  This driver can also be built as a module.  If so, the module
-	  will be called i2c-nforce2-s4985.
-
 config I2C_NVIDIA_GPU
 	tristate "NVIDIA GPU I2C controller"
 	depends on PCI

drivers/i2c/busses/Makefile

@@ -14,14 +14,12 @@ obj-$(CONFIG_I2C_ALI1535)	+= i2c-ali1535.o
 obj-$(CONFIG_I2C_ALI1563)	+= i2c-ali1563.o
 obj-$(CONFIG_I2C_ALI15X3)	+= i2c-ali15x3.o
 obj-$(CONFIG_I2C_AMD756)	+= i2c-amd756.o
-obj-$(CONFIG_I2C_AMD756_S4882)	+= i2c-amd756-s4882.o
 obj-$(CONFIG_I2C_AMD8111)	+= i2c-amd8111.o
 obj-$(CONFIG_I2C_CHT_WC)	+= i2c-cht-wc.o
 obj-$(CONFIG_I2C_I801)		+= i2c-i801.o
 obj-$(CONFIG_I2C_ISCH)		+= i2c-isch.o
 obj-$(CONFIG_I2C_ISMT)		+= i2c-ismt.o
 obj-$(CONFIG_I2C_NFORCE2)	+= i2c-nforce2.o
-obj-$(CONFIG_I2C_NFORCE2_S4985)	+= i2c-nforce2-s4985.o
 obj-$(CONFIG_I2C_NVIDIA_GPU)	+= i2c-nvidia-gpu.o
 obj-$(CONFIG_I2C_PIIX4)		+= i2c-piix4.o
 obj-$(CONFIG_I2C_SIS5595)	+= i2c-sis5595.o

drivers/i2c/busses/i2c-amd756-s4882.c

@@ -283,7 +283,7 @@ static const struct i2c_algorithm smbus_algorithm = {
 	.functionality	= amd756_func,
 };
 
-struct i2c_adapter amd756_smbus = {
+static struct i2c_adapter amd756_smbus = {
 	.owner		= THIS_MODULE,
 	.class          = I2C_CLASS_HWMON,
 	.algo		= &smbus_algorithm,
@@ -398,5 +398,3 @@ module_pci_driver(amd756_driver);
 MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
 MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
 MODULE_LICENSE("GPL");
-
-EXPORT_SYMBOL(amd756_smbus);