linux-kernel - Re: [PATCH] of: reserved_mem: Remove the use of phandle from the reserved

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Message-ID: <171440638161.1895148.11194020129017609758.robh@kernel.org>
Date: Mon, 29 Apr 2024 10:59:51 -0500
From: Rob Herring <robh@...nel.org>
To: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
Cc: saravanak@...gle.com, linux-kernel@...r.kernel.org, kernel@...cinc.com,
	devicetree@...r.kernel.org
Subject: Re: [PATCH] of: reserved_mem: Remove the use of phandle from the
 reserved_mem APIs


On Mon, 22 Apr 2024 16:52:43 -0700, Oreoluwa Babatunde wrote:
> The __find_rmem() function is the only place that references the phandle
> field of the reserved_mem struct. __find_rmem() is used to match a
> device_node object to its corresponding entry in the reserved_mem array
> using its phandle value. But, there is already a function called
> of_reserved_mem_lookup() which carries out the same action using the
> name of the node.
> 
> Using the of_reserved_mem_lookup() function is more reliable because
> every node is gauranteed to have a name, but not all nodes will have a
> phandle.
> 
> Nodes are only assigned a phandle if they are explicitly defined in the
> DT using "phandle = <phandle_number>", or if they are referenced by
> another node in the DT. Hence, If the phandle field is empty, then
> __find_rmem() will return a false negative.
> 
> Hence, delete the __find_rmem() function and switch to using the
> of_reserved_mem_lookup() function to find the corresponding entry of a
> device_node in the reserved_mem array. Since the phandle field of the
> reserved_mem struct is now unused, delete that as well.
> 
> Signed-off-by: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
> ---
>  drivers/of/of_reserved_mem.c    | 26 +++-----------------------
>  include/linux/of_reserved_mem.h |  1 -
>  2 files changed, 3 insertions(+), 24 deletions(-)
> 

Applied, thanks!