linux-kernel - Re: [PATCH 05/12] ARM: s3c: mini2440: Constify the software node

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Date:   Thu, 1 Apr 2021 19:44:02 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Wolfram Sang <wsa@...nel.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/12] ARM: s3c: mini2440: Constify the software node

On 29/03/2021 14:32, Heikki Krogerus wrote:
> On Mon, Mar 29, 2021 at 12:58:41PM +0200, Krzysztof Kozlowski wrote:
>> On 29/03/2021 12:50, Heikki Krogerus wrote:
>>> Additional device properties are always just a part of a
>>> software fwnode. If the device properties are constant, the
>>> software node can also be constant.
>>>
>> Hi,
>>
>> Thanks for your work.
>>
>> I did not get the cover letter nor other patches from this set and I
>> don't see how the i2c uses the swnode. This makes difficult to judge
>> whether this looks reasonable. At least without the context the title
>> looks misleading - you add software_node or change to use software_node
>> instead of constifying it.
> 
> OK, I'll try to open this up somehow...
> 
> Whenever additional device properties are added to devices by using
> the old device property API (device_add_properties()) that also i2c
> core code uses, in reality a software node is always created to hold
> those properties. It's just always dynamically allocated.
> 
> The goal of this series is to prepare the i2c subsystem and drivers
> for the removal of that old device property API, but I did not see
> that as relevant info for this patch, because even if we did not in
> the end remove that old API, this change is still useful.
> 
> The patch does exactly what the subject says. After this we supply the
> device a constant software node instead of a dynamically allocated one.

Thanks for explanation. The follow up question is - can I take it
independently via ARM Samsung/S3C tree?

Best regards,
Krzysztof