[U-Boot] [PATCH 1/3] core: Add function to get device for ofnode

[Mario Six <mario.six@gdsys.cc>]

Hi Simon,

On Fri, Mar 30, 2018 at 12:43 AM, Simon Glass <sjg@chromium.org> wrote:
> Hi Mario,
>
> On 28 March 2018 at 20:37, Mario Six <mario.six@gdsys.cc> wrote:
>> It's sometimes useful to get the device associated with a given ofnode.
>> Implement a function to implement this lookup operation.
>
> Where would you use this? Can you not use phandles to find the device?
> Or uclass_get_device_by_ofnode() ?
>

The function is used with the dev_{enable,disable}_by_path in the next patch:
If I used any of the uclass_* functions or similar, the device would be probed,
which is not what I want, since the device may not actually be physically
present.

>>
>> Signed-off-by: Mario Six <mario.six@gdsys.cc>
>> ---
>>  drivers/core/ofnode.c | 15 +++++++++++++++
>>  include/dm/ofnode.h   |  8 ++++++++
>>  2 files changed, 23 insertions(+)
>>
>> diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
>> index 4e4532651f..ca002063b3 100644
>> --- a/drivers/core/ofnode.c
>> +++ b/drivers/core/ofnode.c
>> @@ -16,6 +16,21 @@
>>  #include <linux/err.h>
>>  #include <linux/ioport.h>
>>
>> +struct udevice *ofnode_dev(ofnode node)
>
> Can you please add a test for this?
>
> This seems like an internal function since it does not probe the
> device. So how about putting it in device.h:
>
> device_get_by_ofnode() - does probe the device it returns
> device_find_by_ofnode() - doesn't probe
>
>> +{
>> +       struct uclass *uc;
>> +       struct udevice *dev;
>> +
>> +       list_for_each_entry(uc, &gd->uclass_root, sibling_node) {
>> +               list_for_each_entry(dev, &uc->dev_head, uclass_node) {
>> +                       if (ofnode_equal(dev_ofnode(dev), node))
>> +                               return dev;
>> +               }
>> +       }
>> +
>> +       return NULL;
>> +}
>> +
>>  int ofnode_read_u32(ofnode node, const char *propname, u32 *outp)
>>  {
>>         assert(ofnode_valid(node));
>> diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
>> index 0d008404f9..aec205eb80 100644
>> --- a/include/dm/ofnode.h
>> +++ b/include/dm/ofnode.h
>> @@ -193,6 +193,14 @@ static inline ofnode ofnode_null(void)
>>         return node;
>>  }
>>
>> +/**
>> + * ofnode_dev() - Get the device associated with a given ofnode
>> + *
>> + * @node:      valid node reference to get the corresponding device for
>> + * @return a pointer to the udevice if OK, NULL on error
>> + */
>> +struct udevice *ofnode_dev(ofnode node);
>> +
>>  /**
>>   * ofnode_read_u32() - Read a 32-bit integer from a property
>>   *
>> --
>> 2.16.1
>>
>
> Regards,
> Simon
>

Everything else will be addressed in v2. Thanks for reviewing!

Best regards,

Mario