platform/x86: Move Mellanox platform hotplug driver to platform/mellanox

In preparation for making the hotplug driver build for different
architectures, move mlxcpld-hotplug.c to platform/mellanox and the
header to include/linux/platform_data as mlxreg.h to reflect the new
interface changes to come.

Replace references to CPLD with REG throughout the files, consistent
with the new name.

Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
[dvhart: update copyright, rewrite commit message]
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

MAINTAINERS

@@ -8860,12 +8860,13 @@ W:	http://www.mellanox.com
 Q:	http://patchwork.ozlabs.org/project/netdev/list/
 F:	drivers/net/ethernet/mellanox/mlxfw/
 
-MELLANOX MLX CPLD HOTPLUG DRIVER
+MELLANOX HARDWARE PLATFORM SUPPORT
+M:	Andy Shevchenko <andy@infradead.org>
+M:	Darren Hart <dvhart@infradead.org>
 M:	Vadim Pasternak <vadimp@mellanox.com>
 L:	platform-driver-x86@vger.kernel.org
 S:	Supported
-F:	drivers/platform/x86/mlxcpld-hotplug.c
-F:	include/linux/platform_data/mlxcpld-hotplug.h
+F:	drivers/platform/mellanox/
 
 MELLANOX MLX4 core VPI driver
 M:	Tariq Toukan <tariqt@mellanox.com>

drivers/platform/Kconfig

@@ -8,3 +8,5 @@ endif
 source "drivers/platform/goldfish/Kconfig"
 
 source "drivers/platform/chrome/Kconfig"
+
+source "drivers/platform/mellanox/Kconfig"

drivers/platform/Makefile

@@ -4,6 +4,7 @@
 #
 
 obj-$(CONFIG_X86)		+= x86/
+obj-$(CONFIG_MELLANOX_PLATFORM)	+= mellanox/
 obj-$(CONFIG_MIPS)		+= mips/
 obj-$(CONFIG_OLPC)		+= olpc/
 obj-$(CONFIG_GOLDFISH)		+= goldfish/

drivers/platform/mellanox/Kconfig

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Platform support for Mellanox hardware
+#
+
+menuconfig MELLANOX_PLATFORM
+	bool "Platform support for Mellanox hardware"
+	depends on X86 || COMPILE_TEST
+	---help---
+	  Say Y here to get to see options for platform support for
+	  Mellanox systems. This option alone does not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and disabled.
+
+if MELLANOX_PLATFORM
+
+config MLXREG_HOTPLUG
+	tristate "Mellanox platform hotplug driver support"
+	depends on HWMON
+	depends on I2C
+	---help---
+	  This driver handles hot-plug events for the power suppliers, power
+	  cables and fans on the wide range Mellanox IB and Ethernet systems.
+
+endif # MELLANOX_PLATFORM

drivers/platform/mellanox/Makefile

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for linux/drivers/platform/mellanox
+# Mellanox Platform-Specific Drivers
+#
+obj-$(CONFIG_MLXREG_HOTPLUG)	+= mlxreg-hotplug.o