On 11 April 2018 at 04:02, Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx> wrote:
> This commit adds a dt-bindings document of PECI adapter driver for Aspeed
We try to capitalise ASPEED.
> AST24xx/25xx SoCs.
> ---
> .../devicetree/bindings/peci/peci-aspeed.txt | 60 ++++++++++++++++++++++
> 1 file changed, 60 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.txt
>
> diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
> new file mode 100644
> index 000000000000..4598bb8c20fa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
> @@ -0,0 +1,60 @@
> +Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs.
> +
> +Required properties:
> +- compatible : Should be "aspeed,ast2400-peci" or "aspeed,ast2500-peci"
> + - aspeed,ast2400-peci: Aspeed AST2400 family PECI
> + controller
> + - aspeed,ast2500-peci: Aspeed AST2500 family PECI
> + controller
> +- reg : Should contain PECI controller registers location and
> + length.
> +- #address-cells : Should be <1>.
> +- #size-cells : Should be <0>.
> +- interrupts : Should contain PECI controller interrupt.
> +- clocks : Should contain clock source for PECI controller.
> + Should reference clkin.
Are you sure that this is driven by clkin? Most peripherals on the
Aspeed are attached to the apb, so should reference that clock.
> +- clock_frequency : Should contain the operation frequency of PECI controller
> + in units of Hz.
> + 187500 ~ 24000000
Can you explain why you need both the parent clock and this frequency
to be specified?
> +
> +Optional properties:
> +- msg-timing-nego : Message timing negotiation period. This value will
Perhaps msg-timing-period? Or just msg-timing?
> + 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.
> + 0 ~ 255 (default: 1)
> +- addr-timing-nego : 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.
> + 0 ~ 255 (default: 1)
> +- rd-sampling-point : 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.
> + 0 ~ 15 (default: 8)
> +- cmd_timeout_ms : Command timeout in units of ms.
> + 1 ~ 60000 (default: 1000)
> +
> +Example:
> + peci: peci@1e78b000 {
> + compatible = "simple-bus";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges = <0x0 0x1e78b000 0x60>;
> +
> + peci0: peci-bus@0 {
> + compatible = "aspeed,ast2500-peci";
> + reg = <0x0 0x60>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + interrupts = <15>;
> + clocks = <&clk_clkin>;
> + clock-frequency = <24000000>;
> + msg-timing-nego = <1>;
> + addr-timing-nego = <1>;
> + rd-sampling-point = <8>;
> + cmd-timeout-ms = <1000>;
> + };
> + };
> --
> 2.16.2
>
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