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SubjectRe: [PATCH v1 2/3] device property: Add fwnode_graph_get_port_parent
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Hi Laurent,

On 18/05/17 14:36, Laurent Pinchart wrote:
> Hi Kieran,
>
> Thank you for the patch.
>
> On Wednesday 17 May 2017 16:03:38 Kieran Bingham wrote:
>> From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
>>
>> V4L2 async notifiers can pass the endpoint fwnode rather than the device
>> fwnode.
>
> I'm not sure I would mention V4L2 in the commit message, as this is generic.

Good point

>> Provide a helper to obtain the parent device fwnode without first
>> parsing the remote-endpoint as per fwnode_graph_get_remote_port_parent.
>>
>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
>> ---
>> drivers/base/property.c | 25 +++++++++++++++++++++++++
>> include/linux/property.h | 2 ++
>> 2 files changed, 27 insertions(+)
>>
>> diff --git a/drivers/base/property.c b/drivers/base/property.c
>> index 627ebc9b570d..caf4316fe565 100644
>> --- a/drivers/base/property.c
>> +++ b/drivers/base/property.c
>> @@ -1245,6 +1245,31 @@ fwnode_graph_get_next_endpoint(struct fwnode_handle
>> *fwnode, EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
>>
>> /**
>> + * fwnode_graph_get_port_parent - Return device node of a port endpoint
>> + * @fwnode: Endpoint firmware node pointing of the port
>> + *
>> + * Extracts firmware node of the device the @fwnode belongs to.
>
> I'm not too familiar with the fwnode API, but I know it's written in C, where
> functions don't extract something but return a value :-) How about
>
> Return: the firmware node of the device the @endpoint belongs to.
>

I'm not averse to the reword - but it is different to the other functions in the
same context:

fwnode_graph_get_remote_endpoint(struct fwnode_handle *fwnode)
* Extracts firmware node of a remote endpoint the @fwnode points to.

struct fwnode_handle *fwnode_graph_get_remote_port(struct fwnode_handle *fwnode)
* Extracts firmware node of a remote port the @fwnode points to.

fwnode_graph_get_remote_port_parent(struct fwnode_handle *fwnode)
* Extracts firmware node of a remote device the @fwnode points to.

Then with this function becoming:

fwnode_graph_get_port_parent(struct fwnode_handle *endpoint)
* Returns firmware node of the device the @endpoint belongs to.


I guess those could be changed too ...


>> + */
>> +struct fwnode_handle *
>> +fwnode_graph_get_port_parent(struct fwnode_handle *fwnode)
>
> This is akin to writing (unsigned int integer)

Yes, good point there - I was thinking of the fwnode as an object itself, but
really it's representing the endpoint, and the fwnode is the class type :)

>
> How about calling the variable endpoint ? That would also make the
> documentation clearer in my opinion, with "the @fwnode belongs to" replaced
> with "the @endpoint belongs to".

Agreed

>
>> +{
>> + struct fwnode_handle *parent = NULL;
>> +
>> + if (is_of_node(fwnode)) {
>> + struct device_node *node;
>> +
>> + node = of_graph_get_port_parent(to_of_node(fwnode));
>> + if (node)
>> + parent = &node->fwnode;
>
> This part looks good to me, with the above small change,
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Thanks,

I'll add this if the code doesn't change drastically based on Sakari's suggestion.

>
>> + } else if (is_acpi_node(fwnode)) {
>> + parent = acpi_node_get_parent(fwnode);
>
> I can't comment on this one though.
>
>> + }
>> +
>> + return parent;
>> +}
>> +EXPORT_SYMBOL_GPL(fwnode_graph_get_port_parent);
>> +
>> +/**
>> * fwnode_graph_get_remote_port_parent - Return fwnode of a remote device
>> * @fwnode: Endpoint firmware node pointing to the remote endpoint
>> *
>> diff --git a/include/linux/property.h b/include/linux/property.h
>> index 2f482616a2f2..624129b86c82 100644
>> --- a/include/linux/property.h
>> +++ b/include/linux/property.h
>> @@ -274,6 +274,8 @@ void *device_get_mac_address(struct device *dev, char
>> *addr, int alen);
>>
>> struct fwnode_handle *fwnode_graph_get_next_endpoint(
>> struct fwnode_handle *fwnode, struct fwnode_handle *prev);
>> +struct fwnode_handle *fwnode_graph_get_port_parent(
>> + struct fwnode_handle *fwnode);
>> struct fwnode_handle *fwnode_graph_get_remote_port_parent(
>> struct fwnode_handle *fwnode);
>> struct fwnode_handle *fwnode_graph_get_remote_port(
>

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