linux-kernel - Re: [PATCH v4 08/15] software_node: Add support for fwnode

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Date:   Mon, 4 Jan 2021 10:35:10 +0000
From:   Daniel Scally <djrscally@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-media@...r.kernel.org, devel@...ica.org,
        gregkh@...uxfoundation.org, rjw@...ysocki.net,
        sergey.senozhatsky@...il.com, mchehab@...nel.org, lenb@...nel.org,
        yong.zhi@...el.com, sakari.ailus@...ux.intel.com,
        bingbu.cao@...el.com, tian.shu.qiu@...el.com,
        robert.moore@...el.com, erik.kaneda@...el.com, pmladek@...e.com,
        rostedt@...dmis.org, linux@...musvillemoes.dk,
        laurent.pinchart+renesas@...asonboard.com,
        jacopo+renesas@...ndi.org, kieran.bingham+renesas@...asonboard.com,
        hverkuil-cisco@...all.nl, m.felsch@...gutronix.de,
        niklas.soderlund+renesas@...natech.se, slongerbeam@...il.com,
        heikki.krogerus@...ux.intel.com, linus.walleij@...aro.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v4 08/15] software_node: Add support for fwnode_graph*()
 family of functions

Hi Andy

On 04/01/2021 10:22, Andy Shevchenko wrote:
> On Sun, Jan 03, 2021 at 11:12:28PM +0000, Daniel Scally wrote:
>> From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
>>
>> This implements the remaining .graph_*() callbacks in the fwnode
>> operations structure for the software nodes. That makes the
>> fwnode_graph_*() functions available in the drivers also when software
>> nodes are used.
>>
>> The implementation tries to mimic the "OF graph" as much as possible, but
>> there is no support for the "reg" device property. The ports will need to
>> have the index in their  name which starts with "port@" (for example
>> "port@0", "port@1", ...) and endpoints will use the index of the software
>> node that is given to them during creation. The port nodes can also be
>> grouped under a specially named "ports" subnode, just like in DT, if
>> necessary.
>>
>> The remote-endpoints are reference properties under the endpoint nodes
>> that are named "remote-endpoint".
> Couple of nitpicks below (can be considered as follow up, depends on yours and
> maintainer wishes).
>
Thanks
> +static int
> +software_node_graph_parse_endpoint(const struct fwnode_handle *fwnode,
> +				   struct fwnode_endpoint *endpoint)
> +{
> +	struct swnode *swnode = to_swnode(fwnode);
> +	const char *parent_name = swnode->parent->node->name;
> +	int ret;
> +
> +	if (!(strlen(parent_name) > strlen("port@")) ||
> A nit:
>
> 	if (strlen("port@") >= strlen(parent_name) ||
>
> better to read

yeah agreed

>
>> +	    strncmp(parent_name, "port@", strlen("port@")))
>> +		return -EINVAL;
>> +
>> +	/* Ports have naming style "port@n", we need to select the n */
>> +	ret = kstrtou32(parent_name + strlen("port@"),
>> +			10, &endpoint->port);
> A nit:
>
> 	ret = kstrtou32(parent_name + strlen("port@"), 10, &endpoint->port);
>
> (perhaps you need to adjust your editor settings, this still fits 80)
Ah - my bad. Originally instead of parent_name there was
swnode->parent->node->name, which didn't fit. When I added the temp
variable I forgot to fix the line break - thanks.