From: Tomer Maimon <tmaimon77@xxxxxxxxx> Added device tree binding documentation for Nuvoton BMC NPCM Platform Environment Control Interface(PECI). Signed-off-by: Tomer Maimon <tmaimon77@xxxxxxxxx> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx> --- Changes since v10: - Newly added in v11. .../devicetree/bindings/peci/peci-npcm.yaml | 102 ++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 Documentation/devicetree/bindings/peci/peci-npcm.yaml diff --git a/Documentation/devicetree/bindings/peci/peci-npcm.yaml b/Documentation/devicetree/bindings/peci/peci-npcm.yaml new file mode 100644 index 000000000000..bcd5626e68e7 --- /dev/null +++ b/Documentation/devicetree/bindings/peci/peci-npcm.yaml @@ -0,0 +1,102 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/peci/peci-npcm.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Nuvoton NPCM PECI Bus Device Tree Bindings + +maintainers: + - Tomer Maimon <tmaimon77@xxxxxxxxx> + +properties: + compatible: + const: nuvoton,npcm750-peci # for the NPCM7XX BMC. + + reg: + maxItems: 1 + + "#address-cells": + # Required to define a client address. + const: 1 + + "#size-cells": + # Required to define a client address. + const: 0 + + interrupts: + maxItems: 1 + + clocks: + # PECI reference clock. + maxItems: 1 + + cmd-timeout-ms: + # Command timeout in units of ms. + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + - minimum: 1 + maximum: 60000 + default: 1000 + + pull-down: + description: | + Defines the PECI I/O internal pull down operation. + 0: pull down always enable + 1: pull down only during transactions. + 2: pull down always disable. + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + - minimum: 0 + maximum: 2 + default: 0 + + host-neg-bit-rate: + description: | + Define host negotiation bit rate divider. + the host negotiation bit rate calculate with formula: + clock frequency[Hz] / [4 x {host-neg-bit-rate + 1}] + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + - minimum: 7 + maximum: 31 + default: 15 + + high-volt-range: + description: | + Adapts PECI I/O interface to voltage range. + 0: PECI I/O interface voltage range of 0.8-1.06V (default) + 1: PECI I/O interface voltage range of 0.95-1.26V + type: boolean + +required: + - compatible + - reg + - "#address-cells" + - "#size-cells" + - interrupts + - clocks + +examples: + - | + #include <dt-bindings/interrupt-controller/arm-gic.h> + #include <dt-bindings/clock/nuvoton,npcm7xx-clock.h> + peci: bus@100000 { + compatible = "simple-bus"; + #address-cells = <1>; + #size-cells = <1>; + ranges = <0x0 0x100000 0x200>; + + peci0: peci-bus@0 { + compatible = "nuvoton,npcm750-peci"; + reg = <0x0 0x200>; + #address-cells = <1>; + #size-cells = <0>; + interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&clk NPCM7XX_CLK_APB3>; + cmd-timeout-ms = <1000>; + pull-down = <0>; + host-neg-bit-rate = <15>; + }; + }; +... -- 2.17.1
