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Documentation: dt-bindings: Document bindings for ASPEED AST2400/AST2500 PWM and Fan tach controller device driver

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This binding provides interface for adding values related to ASPEED
AST2400/2500 PWM and Fan tach controller support.
The PWM controller can support upto 8 PWM output ports.
The Fan tach controller can support upto 16 tachometer inputs.

Signed-off-by: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Jaghathiswari Rankappagounder Natarajan 2017-04-04 17:52:40 -07:00 committed by Guenter Roeck
parent 67043d1853
commit d702b353b9
1 changed files with 68 additions and 0 deletions
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Documentation/devicetree/bindings/hwmon/aspeed-pwm-tacho.txt Normal file
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ASPEED AST2400/AST2500 PWM and Fan Tacho controller device driver
The ASPEED PWM controller can support upto 8 PWM outputs. The ASPEED Fan Tacho
controller can support upto 16 Fan tachometer inputs.
There can be upto 8 fans supported. Each fan can have one PWM output and
one/two Fan tach inputs.
Required properties for pwm-tacho node:
- #address-cells : should be 1.
- #size-cells : should be 1.
- reg : address and length of the register set for the device.
- pinctrl-names : a pinctrl state named "default" must be defined.
- pinctrl-0 : phandle referencing pin configuration of the PWM ports.
- compatible : should be "aspeed,ast2400-pwm-tacho" for AST2400 and
"aspeed,ast2500-pwm-tacho" for AST2500.
- clocks : a fixed clock providing input clock frequency(PWM
and Fan Tach clock)
fan subnode format:
===================
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
one/two Fan tach inputs.
Required properties for each child node:
- reg : should specify PWM source port.
integer value in the range 0 to 7 with 0 indicating PWM port A and
7 indicating PWM port H.
- aspeed,fan-tach-ch : should specify the Fan tach input channel.
integer value in the range 0 through 15, with 0 indicating
Fan tach channel 0 and 15 indicating Fan tach channel 15.
Atleast one Fan tach input channel is required.
Examples:
pwm_tacho_fixed_clk: fixedclk {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <24000000>;
};
pwm_tacho: pwmtachocontroller@1e786000 {
#address-cells = <1>;
#size-cells = <1>;
reg = <0x1E786000 0x1000>;
compatible = "aspeed,ast2500-pwm-tacho";
clocks = <&pwm_tacho_fixed_clk>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm0_default &pinctrl_pwm1_default>;
fan@0 {
reg = <0x00>;
aspeed,fan-tach-ch = /bits/ 8 <0x00>;
};
fan@1 {
reg = <0x01>;
aspeed,fan-tach-ch = /bits/ 8 <0x01 0x02>;
};
};