platform/mellanox: Add support for new SN2201 system

The SN2201 is a highly integrated for one rack unit system with
L3 management switches. It has 48 x 1Gbps RJ45 + 4 x 100G QSFP28
ports in a compact 1RU form factor. The system also including a
serial port (RS-232 interface), an OOB port (1G/100M MDI interface)
and USB ports for management functions.

The processor used on SN2201 is Intel Atom®Processor C Series,
C3338R which is one of the Denverton product families.

System equipped with Nvidia®Spectrum-1 32x100GbE Ethernet switch.

Features:
-  48 ports RJ45 support 10/100/1000M speed.
-  Support 4 QSFP28 ports with 10/25/40/50/100G.
-  A USB port is available on SN2201. This port is used for image and File
   Management purposes - backing up and restoring images and config files
-  Provides flow control mechanism to ensure zero packet loss.
   Uses backpressure for half-duplex operation and IEEE802.3x
   for full duplex operation.
-  Cut-through and Store-and-Forward free switching mechanism.
   By default the mode is cut-through.
-  Standard 1U chassis height.
-  19" rack mountable.
-  Extensive system LED and per port LEDs.
-  Redundant power supply.
-  2 x AC Power Supply (one PSU is default, second PSU is optional).

Signed-off-by: Michael Shych <michaelsh@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20220430115809.54565-3-michaelsh@nvidia.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/mellanox/Kconfig

@@ -78,4 +78,21 @@ config MLXBF_PMC
 	  to performance monitoring counters within various blocks in the
 	  Mellanox BlueField SoC via a sysfs interface.
 
+config NVSW_SN2201
+	tristate "Nvidia SN2201 platform driver support"
+	depends on REGMAP
+	depends on HWMON
+	depends on I2C
+	depends on REGMAP_I2C
+	help
+	  This driver provides support for the Nvidia SN2201 platfom.
+	  The SN2201 is a highly integrated for one rack unit system with
+	  L3 management switches. It has 48 x 1Gbps RJ45 + 4 x 100G QSFP28
+	  ports in a compact 1RU form factor. The system also including a
+	  serial port (RS-232 interface), an OOB port (1G/100M MDI interface)
+	  and USB ports for management functions.
+	  The processor used on SN2201 is Intel Atom®Processor C Series,
+	  C3338R which is one of the Denverton product families.
+	  System equipped with Nvidia®Spectrum-1 32x100GbE Ethernet switch.
+
 endif # MELLANOX_PLATFORM

drivers/platform/mellanox/Makefile

@@ -9,3 +9,4 @@ obj-$(CONFIG_MLXBF_TMFIFO)	+= mlxbf-tmfifo.o
 obj-$(CONFIG_MLXREG_HOTPLUG)	+= mlxreg-hotplug.o
 obj-$(CONFIG_MLXREG_IO) += mlxreg-io.o
 obj-$(CONFIG_MLXREG_LC) += mlxreg-lc.o
+obj-$(CONFIG_NVSW_SN2201) += nvsw-sn2201.o