On 04/05/2012 12:15 PM, David Brown wrote:
> Some MSM SoCs have a small serial-type "bus" that is used to
> communicate with the PMIC devices.  This interface is always
> point-to-point.  I'm doing a device-tree conversion of the driver that
> Ken Heitke posted last year <https://lkml.org/lkml/2011/2/17/503>.
> 
> A naive conversion to device tree, would result in something like
> this:
> 
>       qcom,ssbi@500000 {
>               compatible = "qcom,ssbi";
>               reg = <0x500000 0x1000>;
>               qcom,controller-type = "ssbi";
> 
>               qcom,pmic8058@0 {
>                       reg = <0x0 0x01>;
>                       ...
>               }
>       }
> 
> There would end up being an extraneous register for the device on the
> other end (there are no addresses), and there would need to be code in
> the ssbi driver to traverse this small tree to find these nodes.

Isn't that extra code simply:

of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);

That seems like pretty low overhead.
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