Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 70 insertions, 0 deletions

diff --git a/Documentation/hwmon/mlxreg-fan.rst b/Documentation/hwmon/mlxreg-fan.rst
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+Kernel driver mlxreg-fan
+========================
+
+Provides FAN control for the next Mellanox systems:
+
+- QMB700, equipped with 40x200GbE InfiniBand ports;
+- MSN3700, equipped with 32x200GbE or 16x400GbE Ethernet ports;
+- MSN3410, equipped with 6x400GbE plus 48x50GbE Ethernet ports;
+- MSN3800, equipped with 64x1000GbE Ethernet ports;
+
+Author: Vadim Pasternak <vadimp@mellanox.com>
+
+These are the Top of the Rack systems, equipped with Mellanox switch
+board with Mellanox Quantum or Spectrume-2 devices.
+FAN controller is implemented by the programmable device logic.
+
+The default registers offsets set within the programmable device is as
+following:
+
+======================= ====
+pwm1			0xe3
+fan1 (tacho1)		0xe4
+fan2 (tacho2)		0xe5
+fan3 (tacho3)		0xe6
+fan4 (tacho4)		0xe7
+fan5 (tacho5)		0xe8
+fan6 (tacho6)		0xe9
+fan7 (tacho7)		0xea
+fan8 (tacho8)		0xeb
+fan9 (tacho9)		0xec
+fan10 (tacho10)		0xed
+fan11 (tacho11)		0xee
+fan12 (tacho12)		0xef
+======================= ====
+
+This setup can be re-programmed with other registers.
+
+Description
+-----------
+
+The driver implements a simple interface for driving a fan connected to
+a PWM output and tachometer inputs.
+This driver obtains PWM and tachometers registers location according to
+the system configuration and creates FAN/PWM hwmon objects and a cooling
+device. PWM and tachometers are sensed through the on-board programmable
+device, which exports its register map. This device could be attached to
+any bus type, for which register mapping is supported.
+Single instance is created with one PWM control, up to 12 tachometers and
+one cooling device. It could be as many instances as programmable device
+supports.
+The driver exposes the fan to the user space through the hwmon's and
+thermal's sysfs interfaces.
+
+/sys files in hwmon subsystem
+-----------------------------
+
+================= == ===================================================
+fan[1-12]_fault   RO files for tachometers TACH1-TACH12 fault indication
+fan[1-12]_input   RO files for tachometers TACH1-TACH12 input (in RPM)
+pwm1		  RW file for fan[1-12] target duty cycle (0..255)
+================= == ===================================================
+
+/sys files in thermal subsystem
+-------------------------------
+
+================= == ====================================================
+cur_state	  RW file for current cooling state of the cooling device
+		     (0..max_state)
+max_state	  RO file for maximum cooling state of the cooling device
+================= == ====================================================