linux-kernel - Re: [PATCH 2/7] of: factor out of_map

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Message-ID: <j6euiso3pcg7nvewscsfjkqyfl55ajxxybf2pib3622uontj2y@aqj4satyf7b7>
Date: Wed, 4 Feb 2026 03:11:57 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Vijayanand Jitta <vijayanand.jitta@....qualcomm.com>
Cc: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Bryan O'Donoghue <bod@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Saravana Kannan <saravanak@...nel.org>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Stefan Schmidt <stefan.schmidt@...aro.org>,
        Hans Verkuil <hverkuil@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Vishnu Reddy <busanna.reddy@....qualcomm.com>,
        Hans Verkuil <hverkuil+cisco@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux.dev,
        Charan Teja Kalla <charan.kalla@....qualcomm.com>
Subject: Re: [PATCH 2/7] of: factor out of_map_id() code

On Tue, Feb 03, 2026 at 03:43:58PM +0530, Vijayanand Jitta wrote:
> 
> 
> On 2/2/2026 8:22 PM, Bryan O'Donoghue wrote:
> > On 26/01/2026 12:25, Vikash Garodia wrote:
> >> From: Charan Teja Kalla <charan.kalla@....qualcomm.com>
> > 
> > This commit message is confusing and inaccurate.
> > 
> > First up, you're not factoring _out_ of_map_id() - factor out of_map_id() means to remove of_map_id() - you are refactoring of_map_id().
> > 
> > Your patch title should be something like "refactor of_map_id() to prepare for mapping of multiple IDs to a single device"
> > 
> 
> Sure, will update the commit.
> 
> >> Linux interprets multiple mappings for the same input ID as a set of
> >> equivalent choices to pick one. There exists usecases where these set
> >> must be maintained in parallel, ex: on ARM, a dynamically created child
> >> device(s) is referencing multiple input id's in parent iommu-map.
> >>
> >> Factor out the code where multiple mappings needs to be maintained in
> >> parallel can be achieved through callback from this factored out code.
> > 
> > Which callback ? There is no ->function(pointer, here...); ?!
> > 
> > Just make some plain and straightforward statements about what you are doing and why. There's no need to resort to dissertation-speak.
> > 
> 
> The callback in introduced in patch 2 of this series. will update the commit descripition as suggested.

I think, the callback was NAKed already.


-- 
With best wishes
Dmitry