> +Optional properties:
> +- vsc8531,vddmac : The vddmac in mV.
> +- vsc8531,edge-slowdown : % the edge should be slowed down relative to
> + the fastest possible edge time. Native sign
> + need not enter.
> + Edge rate sets the drive strength of the MAC
> + interface output signals. Changing the drive
> + strength will affect the edge rate of the output
> + signal. The goal of this setting is to help
> + reduce electrical emission (EMI) by being able
> + to reprogram drive strength and in effect slow
> + down the edge rate if desired. Table 5 shows the
Hi Raju
There is no table five here? Is that a reference to a data sheet
table?
> +Example:
> +
> + vsc8531_0: ethernet-phy@0 {
> + compatible = "ethernet-phy-id0007.0570";
> + vsc8531,vddmac = /bits/ 16 <MSCC_VDDMAC_3300>;
> + vsc8531,edge-slowdown = /bits/ 8 <17>;
No, real values please:
vsc8531,vddmac = <2000>;
vsc8531,edge-slowdown = <21>;
The driver should then do the maths to figure out the nearest magic
value to write to the register, or complain the settings are out of
range with an -EINVAL.
FYI: No floating point maths are allowed in the kernel.
Andrew
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