On Tue, Nov 07, 2023 at 06:50:24PM +0800, Billy Tsai wrote: > Document the compatible for aspeed,ast2600-pwm-tach device, which can > support up to 16 PWM outputs and 16 fan tach input. > > Signed-off-by: Billy Tsai <billy_tsai@xxxxxxxxxxxxxx> > --- > .../bindings/hwmon/aspeed,g6-pwm-tach.yaml | 69 +++++++++++++++++++ > 1 file changed, 69 insertions(+) > create mode 100644 Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml > > diff --git a/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml b/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml > new file mode 100644 > index 000000000000..c615fb10705c > --- /dev/null > +++ b/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml > @@ -0,0 +1,69 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +# Copyright (C) 2023 Aspeed, Inc. > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/hwmon/aspeed,g6-pwm-tach.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: ASPEED G6 PWM and Fan Tach controller > + > +maintainers: > + - Billy Tsai <billy_tsai@xxxxxxxxxxxxxx> > + > +description: | > + The ASPEED PWM controller can support up to 16 PWM outputs. > + The ASPEED Fan Tacho controller can support up to 16 fan tach input. > + They are independent hardware blocks, which are different from the > + previous version of the ASPEED chip. > + > +properties: > + compatible: > + enum: > + - aspeed,ast2600-pwm-tach > + > + reg: > + maxItems: 1 > + > + clocks: > + maxItems: 1 > + > + resets: > + maxItems: 1 > + > + "#pwm-cells": > + const: 3 > + > +patternProperties: > + "^fan-[0-9]+$": > + $ref: fan-common.yaml# > + unevaluatedProperties: false > + required: > + - tach-ch > + > +required: > + - reg > + - clocks > + - resets > + - "#pwm-cells" > + - compatible > + > +additionalProperties: false > + > +examples: > + - | > + #include <dt-bindings/clock/aspeed-clock.h> > + pwm_tach: pwm-tach-controller@1e610000 { > + compatible = "aspeed,ast2600-pwm-tach"; > + reg = <0x1e610000 0x100>; > + clocks = <&syscon ASPEED_CLK_AHB>; > + resets = <&syscon ASPEED_RESET_PWM>; > + #pwm-cells = <3>; > + > + fan-0 { I assume there's a PWM connection here? How do you know which PWM? You said the tach channel is independent, so it is not that. It should not be 0 from 'fan-0' because that's just a meaningless index. You either need 'pwms' here or you can use 'reg' and the reg value is the PWM channel. > + tach-ch = /bits/ 8 <0x0>; > + }; > + > + fan-1 { > + tach-ch = /bits/ 8 <0x1 0x2>; > + }; > + }; > -- > 2.25.1 >
