linux-kernel - Re: [PATCH V3 1/1] dt: add of_get_child

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Message-ID: <CAA+hA=Q0kKX+mdAH0H-XXpHgJOLNPM4me_+qh4oSWd3+Jg02FA@mail.gmail.com>
Date:	Sun, 15 Apr 2012 11:51:27 +0800
From:	Dong Aisheng <dongas86@...il.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Dong Aisheng <dong.aisheng@...aro.org>,
	devicetree-discuss@...ts.ozlabs.org, grant.likely@...retlab.ca,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V3 1/1] dt: add of_get_child_count helper function

On Sun, Apr 15, 2012 at 11:15 AM, Rob Herring <robherring2@...il.com> wrote:
> On 04/13/2012 01:07 PM, Dong Aisheng wrote:
>> Hi Rob,
>>
>> On Mon, Feb 13, 2012 at 4:22 AM, Rob Herring <robherring2@...il.com> wrote:
>>> On 02/11/2012 11:22 AM, Dong Aisheng wrote:
>>>> Currently most code to get child count in kernel are almost same,
>>>> add a helper to implement this function for dt to use.
>>>>
>>>> Signed-off-by: Dong Aisheng <dong.aisheng@...aro.org>
>>>> Cc: Grant Likely <grant.likely@...retlab.ca>
>>>> Cc: Rob Herring <rob.herring@...xeda.com>
>>>>
>>>> ---
>>>> Hi Rob,
>>>>
>>>> Since my imx pinctrl driver series still depends on the pinctrl core dt
>>>> binding patch which is still not in mainline, i'd like this pure dt patch
>>>> go separately first in case others want to use.
>>>>
>>>
>>> Applied for 3.4.
>>>
>> I did not see this in 3.4 kernel.
>> Anything i missed?
>> My pinctrl-imx driver i just sent is using this.
>
> Sorry, I did not get this sent to Grant in time. Go ahead and merge it
> with your pinctrl driver.
>
It's fine to me,
so i can add your ack, right?

Regards
Dong Aisheng

>
>>
>> Regards
>> Dong Aisheng
>>
>>> Rob
>>>
>>>> changes v2->v3:
>>>>  Addressed some people's comments:
>>>>  * do not use assignment as expression
>>>>  * return 0 for non-dt case
>>>>
>>>> Changes v1->v2:
>>>>  * change the name from of_get_child_number to of_get_child_count
>>>> ---
>>>>  include/linux/of.h |   16 ++++++++++++++++
>>>>  1 files changed, 16 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/include/linux/of.h b/include/linux/of.h
>>>> index a75a831..ae242ef 100644
>>>> --- a/include/linux/of.h
>>>> +++ b/include/linux/of.h
>>>> @@ -195,6 +195,17 @@ extern struct device_node *of_get_next_child(const struct device_node *node,
>>>>       for (child = of_get_next_child(parent, NULL); child != NULL; \
>>>>            child = of_get_next_child(parent, child))
>>>>
>>>> +static inline int of_get_child_count(const struct device_node *np)
>>>> +{
>>>> +     struct device_node *child = NULL;
>>>> +     int num = 0;
>>>> +
>>>> +     while ((child = of_get_next_child(np, child)) != NULL)
>>>> +             num++;
>>>> +
>>>> +     return num;
>>>> +}
>>>> +
>>>>  extern struct device_node *of_find_node_with_property(
>>>>       struct device_node *from, const char *prop_name);
>>>>  #define for_each_node_with_property(dn, prop_name) \
>>>> @@ -268,6 +279,11 @@ static inline bool of_have_populated_dt(void)
>>>>  #define for_each_child_of_node(parent, child) \
>>>>       while (0)
>>>>
>>>> +static inline int of_get_child_count(const struct device_node *np)
>>>> +{
>>>> +     return 0;
>>>> +}
>>>> +
>>>>  static inline int of_device_is_compatible(const struct device_node *device,
>>>>                                         const char *name)
>>>>  {
>>>
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