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[hwmon-next,v4,3/3] docs: hwmon: add emc2305.rst to docs

Message ID 20220623165217.59252-4-michaelsh@nvidia.com (mailing list archive)
State New
Headers show
Series Add support for EMC2305 Fan Speed Controller. | expand

Commit Message

Michael Shych June 23, 2022, 4:52 p.m. UTC
From: Michael Shych <michaelsh@nvidia.com>

Add description of emc2305 driver.

Signed-off-by: Michael Shych <michaelsh@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
- Add document to index.rst
 Documentation/hwmon/emc2305.rst | 40 ++++++++++++++++++++++++++++++++++++++++
 Documentation/hwmon/index.rst   |  1 +
 2 files changed, 41 insertions(+)
 create mode 100644 Documentation/hwmon/emc2305.rst
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diff --git a/Documentation/hwmon/emc2305.rst b/Documentation/hwmon/emc2305.rst
new file mode 100644
index 000000000000..258da49d18f9
--- /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
+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:
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index f7113b0f8b2a..83b082d222af 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -63,6 +63,7 @@  Hardware Monitoring Kernel Drivers
+   emc2305