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