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Documentation: dt-bindings: aspeed-pwm-tacho cooling device. 

It's add support for cooling device creation to
aspeed-pwm-tacho.
Cooling device could be bound to a thermal zone
for the thermal control.

Signed-off-by: Mykola Kostenok <c_mykolak@mellanox.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Mykola Kostenok 2017-08-03 11:46:50 +03:00 committed by Guenter Roeck
parent c159be9e90
commit 5e047541c1
1 changed files with 9 additions and 0 deletions
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9
Documentation/devicetree/bindings/hwmon/aspeed-pwm-tacho.txt
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@ -11,6 +11,8 @@ Required properties for pwm-tacho node:
- #size-cells : should be 1. - #size-cells : should be 1.
- #cooling-cells: should be 2.
- reg : address and length of the register set for the device. - reg : address and length of the register set for the device.
- pinctrl-names : a pinctrl state named "default" must be defined. - pinctrl-names : a pinctrl state named "default" must be defined.
@ -28,12 +30,17 @@ fan subnode format:
Under fan subnode there can upto 8 child nodes, with each child node Under fan subnode there can upto 8 child nodes, with each child node
representing a fan. If there are 8 fans each fan can have one PWM port and representing a fan. If there are 8 fans each fan can have one PWM port and
one/two Fan tach inputs. one/two Fan tach inputs.
For PWM port can be configured cooling-levels to create cooling device.
Cooling device could be bound to a thermal zone for the thermal control.
Required properties for each child node: Required properties for each child node:
- reg : should specify PWM source port. - reg : should specify PWM source port.
integer value in the range 0 to 7 with 0 indicating PWM port A and integer value in the range 0 to 7 with 0 indicating PWM port A and
7 indicating PWM port H. 7 indicating PWM port H.
- cooling-levels: PWM duty cycle values in a range from 0 to 255
which correspond to thermal cooling states.
- aspeed,fan-tach-ch : should specify the Fan tach input channel. - aspeed,fan-tach-ch : should specify the Fan tach input channel.
integer value in the range 0 through 15, with 0 indicating integer value in the range 0 through 15, with 0 indicating
Fan tach channel 0 and 15 indicating Fan tach channel 15. Fan tach channel 0 and 15 indicating Fan tach channel 15.
@ -50,6 +57,7 @@ pwm_tacho_fixed_clk: fixedclk {
pwm_tacho: pwmtachocontroller@1e786000 { pwm_tacho: pwmtachocontroller@1e786000 {
#address-cells = <1>; #address-cells = <1>;
#size-cells = <1>; #size-cells = <1>;
#cooling-cells = <2>;
reg = <0x1E786000 0x1000>; reg = <0x1E786000 0x1000>;
compatible = "aspeed,ast2500-pwm-tacho"; compatible = "aspeed,ast2500-pwm-tacho";
clocks = <&pwm_tacho_fixed_clk>; clocks = <&pwm_tacho_fixed_clk>;
@ -58,6 +66,7 @@ pwm_tacho: pwmtachocontroller@1e786000 {
fan@0 { fan@0 {
reg = <0x00>; reg = <0x00>;
cooling-levels = /bits/ 8 <125 151 177 203 229 255>;
aspeed,fan-tach-ch = /bits/ 8 <0x00>; aspeed,fan-tach-ch = /bits/ 8 <0x00>;
}; };