linux-kernel - Re: [PATCH v2 2/3] of: factor arguments passed to of_map

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Message-ID: <20251209200214.GA1015230-robh@kernel.org>
Date: Tue, 9 Dec 2025 14:02:14 -0600
From: Rob Herring <robh@...nel.org>
To: Vijayanand Jitta <vijayanand.jitta@....qualcomm.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	robin.murphy@....com, will@...nel.org, joro@...tes.org,
	konrad.dybcio@....qualcomm.com, bjorn.andersson@....qualcomm.com,
	bod@...nel.org, conor+dt@...nel.org, krzk+dt@...nel.org,
	charan.kalla@....qualcomm.com, prakash.gupta@....qualcomm.com,
	vikash.garodia@....qualcomm.com, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/3] of: factor arguments passed to of_map_id() into a
 struct

On Mon, Dec 08, 2025 at 07:10:32PM +0530, Vijayanand Jitta wrote:
> 
> 
> On 12/5/2025 10:17 PM, Dmitry Baryshkov wrote:
> > On 04/12/2025 11:55, Vijayanand Jitta wrote:
> >> From: Charan Teja Kalla <charan.kalla@....qualcomm.com>
> >>
> >> Introduce a new struct type where the optional arguments passed to
> >> of_map_id() are in struct. Subsequent patches add additional arguments
> >> to the struct that the caller expects to be filled of_map_id().
> > 
> > Why do we need a separate struct? Can't we use of_phandle_args instead?
> > 
> 
> The idea is to use it for multi-map support mentioned in the cover letter,
> where we need to pass additional context (callback, dev etc..). Having a
> seperate structure here makes of_map_id() interface easier to extend.

Then perhaps?:

struct of_map_id_args {
	struct of_phandle_args args;
        ...
}

> 
> >>
> >> Signed-off-by: Charan Teja Kalla <charan.kalla@....qualcomm.com>
> >> Signed-off-by: Vijayanand Jitta <vijayanand.jitta@....qualcomm.com>
> >> ---
> >>   drivers/iommu/of_iommu.c              |  6 +++++-
> >>   drivers/of/base.c                     | 31 ++++++++++++++-------------
> >>   drivers/pci/controller/dwc/pci-imx6.c |  6 +++++-
> >>   drivers/pci/controller/pcie-apple.c   |  5 ++++-
> >>   drivers/xen/grant-dma-ops.c           |  5 ++++-
> >>   include/linux/of.h                    | 23 ++++++++++++++------
> >>   6 files changed, 50 insertions(+), 26 deletions(-)
> >>
>