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SubjectRe: [PATCH] mfd: core: introduce of_node_name for mfd sub devices
On Thursday 19 September 2013 05:52 PM, Lee Jones wrote:
>>>>> Do the sub-nodes have their own properties? If so, it would be worth
>>>>> breaking them up as other OSes could reuse the specifics. If they do,
>>>>> then you need so put them in the binding. If they don't, then you do
>>>>> not require sub-nodes. The MFD core will ensure the sub-devices are
>>>>> probed and there is no requirement for the of_node to be assigned.
>>>> You do see some reusable IP blocks (like the regualtors on the wm831x
>>>> PMICs for example, they're repeated blocks) which can be reused but
>>>> generally they have a register base as part of the binding. Personally
>>>> if it's just a property or two I'd probably just put them on the root
>>>> node for the device.
>>> Agreed. Besides, there doesn't seem to be *any* sub-device properties
>>> defined in the binding document. So what are you trying to achieve
>>> with the child nodes?
>> I wanted to have the DT like:
>>
>> as3722 {
>> compatible = "ams,as3722";
>> reg = <0x40>;
>>
>> #interrupt-controller;
>> .....
>>
>>
>> regulators {
>> ldo1-in-supply = <..>;
>> ....
>> sd0 {
>> regulator-name = "vdd-cpu";
>> .....
>> };
>> sd1 {
>> regulator-name = "vdd-ddr";
>> .....
>> };
>> ....
>> };
>> };
>>
>> And regulator driver should get the regulator node by their
>> pdev->dev.of_node.
>> Currently, in most of driver, we are having the code on regulator
>> driver to get "regulators" node from parent node which I want to
>> avoid.
> Ah, I see. Yes, I believe the regulators should have their own node,
> complete with a compatible string. To have each regulator listed
> separately in the parent node seems a little messy. Just out of
> interest, how many regulators are we talking about here?
>
There is 7 DCDC step down and 10 LDOs.
It is more readable if sub-module properties are grouped and defined on
different sub-node in place of having this in single parent node.




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