[PATCH v4 02/13] dt-bindings: Add bindings for peci-aspeed

[Billy Tsai]

Hi Zev,

On 2021/12/2, 9:55 AM, "Zev Weiss" <zweiss at equinix.com> wrote:

    On Wed, Dec 01, 2021 at 02:38:04AM PST, Billy Tsai wrote:
    >   >Hi,
    >   >
    >   >On 2021/11/23, 10:10 PM, "openbmc on behalf of Iwona Winiarska" <openbmc-bounces+billy_tsai=aspeedtech.com at lists.ozlabs.org on behalf of iwona.winiarska at intel.com> wrote:
    >   >
    >   >    Add device tree bindings for the peci-aspeed controller driver.
    >   >
    >   >    >   +  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
    >   >I suggest deleting these three properties and replacing them with the following
    >   >
    >   >aspeed,peci-bit-time:
    >   >        description:
    >   >          The bit time driven by PECI controller. The unit of the value is Hz.
    >   >    minimum: 2000
    >   >    maximum: 1000000
    >   >
    >   >And the driver should use this property to caculate the appropriate clock-divider,
    >   >msg-timing and addr-timing, instead of exposing hardware registers to dts.
    >   >

    >   Or perhaps just 'bus-frequency' a la i2c-aspeed, gpio-aspeed-sgpio, etc?

It's a good ideal for the consistency.

Thanks

Best Regards,
Billy Tsai