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From 653ef165247824be27e900ab28d1f8aa74c09604 Mon Sep 17 00:00:00 2001
From: Michael Shych <michaelsh@nvidia.com>
Date: Sat, 30 Apr 2022 14:49:05 +0300
Subject: [PATCH] docs: hwmon: add emc2305.rst to docs
Submitted to linux-hwmon mailing list at
https://patchwork.kernel.org/project/linux-hwmon/patch/20220430114905.53448-4-michaelsh@nvidia.com/
Add description of emc2305 driver.
Signed-off-by: Michael Shych <michaelsh@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
---
Documentation/hwmon/emc2305.rst | 40 +++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
create mode 100644 Documentation/hwmon/emc2305.rst
--- /dev/null
+++ b/Documentation/hwmon/emc2305.rst
@@ -0,0 +1,40 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver emc2305
+=====================
+
+Supported chips:
+ Microchip EMC2305, EMC2303, EMC2302, EMC2301
+
+ Addresses scanned: I2C 0x27, 0x2c, 0x2d, 0x2e, 0x2f, 0x4c, 0x4d
+ Prefixes: 'emc2305'
+
+ Datasheet: Publicly available at the Microchip website :
+ https://www.microchip.com/en-us/product/EMC2305
+
+Description:
+-----------
+This driver implements support for Microchip EMC2301/2/3/5 RPM-based PWM Fan Controller.
+The EMC2305 Fan Controller supports up to 5 independently controlled PWM fan drives.
+Fan rotation speeds are reported in RPM.
+The driver supports the RPM-based PWM control to keep a fan at the desired speed.
+The driver provides the possibility to have one common PWM interface for all FANs
+or up to the maximum available or configured independent PWMs.
+
+The driver provides the following sysfs interfaces in hwmon subsystem:
+
+================= == ===================================================
+fan[1-5]_fault RO files for tachometers TACH1-TACH5 fault indication
+fan[1-5]_input RO files for tachometers TACH1-TACH5 input (in RPM)
+pwm[1-5] RW file for fan[1-5] target duty cycle (0..255)
+================= == ===================================================
+
+sysfs interfaces in thermal subsystem:
+
+================= == ========================================================================
+cur_state RW file for the current cooling state of the cooling device (0..max_state)
+max_state RO file for the maximum cooling state of the cooling device
+================= == ========================================================================
+
+Configuration is possible via device tree:
+Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
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