linux-kernel - Re: [PATCH V5 1/3] of: dynamic: Add interfaces for creating device node dynamically

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Date:   Mon, 2 Jan 2023 14:50:46 +0100
From:   Clément Léger <clement.leger@...tlin.com>
To:     Lizhi Hou <lizhi.hou@....com>
Cc:     <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <robh@...nel.org>,
        <frowand.list@...il.com>, <helgaas@...nel.org>, <max.zhen@....com>,
        <sonal.santan@....com>, <larry.liu@....com>, <brian.xu@....com>,
        <stefano.stabellini@...inx.com>, <trix@...hat.com>,
        "Allan.Nielsen@...rochip.com" <Allan.Nielsen@...rochip.com>,
        "Horatiu.Vultur@...rochip.com" <Horatiu.Vultur@...rochip.com>,
        "Steen.Hegelund@...rochip.com" <Steen.Hegelund@...rochip.com>
Subject: Re: [PATCH V5 1/3] of: dynamic: Add interfaces for creating device
 node dynamically

Le Thu, 15 Dec 2022 09:30:44 -0800,
Lizhi Hou <lizhi.hou@....com> a écrit :

> of_create_node() creates device node dynamically. The parent device node
> and full name are required for creating the node. It optionally creates
> an OF changeset and attaches the newly created node to the changeset. The
> device node pointer and the changeset pointer can be used to add
> properties to the device node and apply the node to the base tree.
> 
> of_destroy_node() frees the device node created by of_create_node(). If
> an OF changeset was also created for this node, it will destroy the
> changeset before freeing the device node.
> 
> Expand of_changeset APIs to handle specific types of properties.
>     of_changeset_add_prop_string()
>     of_changeset_add_prop_string_array()
>     of_changeset_add_prop_u32_array()
> 
> Signed-off-by: Lizhi Hou <lizhi.hou@....com>
> Signed-off-by: Sonal Santan <sonal.santan@....com>
> Signed-off-by: Max Zhen <max.zhen@....com>
> Reviewed-by: Brian Xu <brian.xu@....com>
> ---
>  drivers/of/dynamic.c | 197 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/of.h   |  24 ++++++
>  2 files changed, 221 insertions(+)
> 
> diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
> index cd3821a6444f..067d996a9f79 100644
> --- a/drivers/of/dynamic.c
> +++ b/drivers/of/dynamic.c
> @@ -461,6 +461,71 @@ struct device_node *__of_node_dup(const struct device_node *np,
>  	return NULL;
>  }
>  
> +/**
> + * of_create_node - Dynamically create a device node
> + *
> + * @parent: Pointer to parent device node
> + * @full_name: Node full name
> + * @cset: Pointer to returning changeset
> + *
> + * Return: Pointer to the created device node or NULL in case of an error.
> + */
> +struct device_node *of_create_node(struct device_node *parent,
> +				   const char *full_name,
> +				   struct of_changeset **cset)
> +{
> +	struct of_changeset *ocs;
> +	struct device_node *np;
> +	int ret;
> +
> +	np = __of_node_dup(NULL, full_name);
> +	if (!np)
> +		return NULL;
> +	np->parent = parent;
> +
> +	if (!cset)
> +		return np;
> +
> +	ocs = kmalloc(sizeof(*cset), GFP_KERNEL);

I started to test this series and this sizeof(*cset) is probably wrong,
it should be sizeof(*ocs) or it will yield the size of a struct
of_changeset pointer and not the struct of_changeset itself.

-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com