Re: [Xen-devel] [PATCH 2/8] xen/arm: Retrieve the correct number of cells when building dom0 DT

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 28/09/15 16:19, Ian Campbell wrote:
> On Mon, 2015-09-28 at 15:59 +0100, Julien Grall wrote:
>> Hi Ian,
>>
>> On 25/09/15 17:01, Ian Campbell wrote:
>>> On Tue, 2015-09-22 at 18:47 +0100, Julien Grall wrote:
>>>> The function dt_n_*_cells will retrieve the number of cells for a
>>>> given
>>>> node. Those numbers may not be correct to use for the child "reg"
>>>> property if the parent is passed.
>>>
>>> I think a clearer way to express this is that the functions return the
>>> number of cells to use for a reg property in the given node, and so
>>> they
>>> will naturally not necessarily return the right number if you give them
>>> some other node (whether that's the parent or some other node
>>> entirely).
>>
>> I will rework this part into:
>>
>> "The function dt_n_*_cells return the number of cells to use for a reg
>> property in a given node. So those numbers won't be correct if the
>> parent of a give node is passed."
> 
>                   ^n
> 
>>
>>>
>>>> This is fine today because the parent is always the root node which
>>>> means there is no upper parent.
>>>>
>>>> Introduce new helpers dt_child_n_*_cells to retrieve the number of
>>>> cells for the address and size that can be used to create the "reg"
>>>> property of a child of a given parent.
>>>
>>> "of the immediate child of a given"
>>>
>>> maybe?
>>
>> I'm not sure to see why "immediate" is necessary here. A child is always
>> immediate, otherwise it would be grandchild or else.
> 
> Sadly it's not as unambiguous as that in this kind of context, child could
> be taken to mean "somewhere below".

I will add the "immediate" to remove the ambiguity.

Regards,

-- 
Julien Grall

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