How to handle named resources with DT?
scottwood at freescale.com
Tue Aug 9 14:26:29 EDT 2011
On 08/09/2011 12:47 PM, Cousson, Benoit wrote:
> On 8/9/2011 7:23 PM, Grant Likely wrote:
>> There is no analogous mechanism for _byname in the device tree. The
>> DT binding for a device must explicitly state what order the register
>> ranges are in. The driver will need to be adapted.
> That seems to be a small regression for my point of view. Relying on the
> order is not super safe. This is not very readable either. That's for
> that exact reason that we changed our drivers to use
> platform_get_resource_byname. That's probably the reason why that API is
> there as well.
> For the same IP, the number of entries can vary depending of the SoC
> By using the _byname, we can check if the resource is there or not
> without having to care about the position.
You could have a named u32 property that contains the reg index, e.g.:
reg = <0x20000 0x200 0x24000 0x200>;
foo-reg = <0>;
bar-reg = <1>;
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