linux-kernel - Re: [PATCH v3 1/2] of: create of

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Date:   Mon, 27 Feb 2023 11:17:41 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Clément Léger <clement.leger@...tlin.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lizhi Hou <lizhi.hou@...inx.com>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Steen Hegelund <steen.hegelund@...rochip.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 1/2] of: create of_root if no dtb provided

On Thu, Feb 23, 2023 at 3:34 PM Frank Rowand <frowand.list@...il.com> wrote:
>
> When enabling CONFIG_OF on a platform where of_root is not populated by
> firmware, we end up without a root node. In order to apply overlays and
> create subnodes of the root node, we need one. Create this root node
> by unflattening an empty builtin dtb.
>
> If firmware provides a flattened device tree (FDT) then the FDT is
> unflattened via setup_arch().  Otherwise, setup_of() which is called
> immediately after setup_arch(), and will create the default root node
> if it does not exist.

Why do we need a hook after setup_arch() rather than an initcall?

Rob