Add device tree bindings for the peci-aspeed controller driver. Co-developed-by: Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx> Signed-off-by: Iwona Winiarska <iwona.winiarska@xxxxxxxxx> Reviewed-by: Rob Herring <robh@xxxxxxxxxx> --- .../devicetree/bindings/peci/peci-aspeed.yaml | 109 ++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.yaml diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.yaml b/Documentation/devicetree/bindings/peci/peci-aspeed.yaml new file mode 100644 index 000000000000..2929d1e000d8 --- /dev/null +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.yaml @@ -0,0 +1,109 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/peci/peci-aspeed.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Aspeed PECI Bus Device Tree Bindings + +maintainers: + - Iwona Winiarska <iwona.winiarska@xxxxxxxxx> + - Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx> + +allOf: + - $ref: peci-controller.yaml# + +properties: + compatible: + enum: + - aspeed,ast2400-peci + - aspeed,ast2500-peci + - aspeed,ast2600-peci + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + clocks: + description: + Clock source for PECI controller. Should reference the external + oscillator clock. + maxItems: 1 + + resets: + maxItems: 1 + + cmd-timeout-ms: + minimum: 1 + maximum: 1000 + default: 1000 + + aspeed,clock-divider: + description: + This value determines PECI controller internal clock dividing + rate. The divider will be calculated as 2 raised to the power of + the given value. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 7 + default: 0 + + aspeed,msg-timing: + description: + Message timing negotiation period. This value will determine the period + of message timing negotiation to be issued by PECI controller. The unit + of the programmed value is four times of PECI clock period. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 255 + default: 1 + + aspeed,addr-timing: + description: + Address timing negotiation period. This value will determine the period + of address timing negotiation to be issued by PECI controller. The unit + of the programmed value is four times of PECI clock period. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 255 + default: 1 + + aspeed,rd-sampling-point: + description: + Read sampling point selection. The whole period of a bit time will be + divided into 16 time frames. This value will determine the time frame + in which the controller will sample PECI signal for data read back. + Usually in the middle of a bit time is the best. + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 0 + maximum: 15 + default: 8 + +required: + - compatible + - reg + - interrupts + - clocks + - resets + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/arm-gic.h> + #include <dt-bindings/clock/ast2600-clock.h> + peci-controller@1e78b000 { + compatible = "aspeed,ast2600-peci"; + reg = <0x1e78b000 0x100>; + interrupts = <GIC_SPI 38 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&syscon ASPEED_CLK_GATE_REF0CLK>; + resets = <&syscon ASPEED_RESET_PECI>; + cmd-timeout-ms = <1000>; + aspeed,clock-divider = <0>; + aspeed,msg-timing = <1>; + aspeed,addr-timing = <1>; + aspeed,rd-sampling-point = <8>; + }; +... -- 2.31.1
