linux-kernel - Re: [PATCH] of: property: fw_devlink: Fix stupid bug in remote-endpoint parsing

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Date: Tue, 26 Mar 2024 13:31:43 +1100
From: John Watts <contact@...kia.org>
To: Saravana Kannan <saravanak@...gle.com>
Cc: Rob Herring <robh+dt@...nel.org>, Frank Rowand <frowand.list@...il.com>,
	Hervé Codina <herve.codina@...tlin.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>, kernel-team@...roid.com,
	Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of: property: fw_devlink: Fix stupid bug in
 remote-endpoint parsing

Hello again,

On Mon, Mar 25, 2024 at 06:35:45PM -0700, Saravana Kannan wrote:
> Ok, I have a solution. Have the audio-graph-card2 find the fwnode of
> "multi" and mark it as "not a device" by doing something like this in
> the driver. That should help fw_devlink handle this correctly.
> 
> fwnode.flags |= FWNODE_FLAG_NOT_DEVICE;

I have done this:


	struct device_node *node = dev->of_node;
	struct device_node *node2;
	node2 = of_get_child_by_name(node, "multi");
	printk("node2 %pOF %pfw %x\n", node2, node2->fwnode, node2->fwnode.flags);
	node2->fwnode.flags |= FWNODE_FLAG_NOT_DEVICE;
	of_node_put(node2);

This doesn't do anything, but this does:

	struct device_node *node = dev->of_node;
	struct device_node *node2;
	node2 = of_get_child_by_name(node, "multi");
	fw_devlink_purge_absent_suppliers(&node2->fwnode);
	printk("node2 %pOF %pfw %x\n", node2, node2->fwnode, node2->fwnode.flags);
	of_node_put(node2);

Should I be using fw_devlink_purge_absent_suppliers?

> -Saravana

John.