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

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Date: Mon, 29 Apr 2024 10:53:46 -0700
From: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
To: Rob Herring <robh@...nel.org>
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 4/29/2024 8:59 AM, Rob Herring wrote:
> 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!
Thank you!
>