linux-kernel - Re: [PATCH v2 04/21] of: Move of

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Date:   Wed, 8 Mar 2023 15:51:58 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Walle <michael@...le.cc>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Robert Marko <robert.marko@...tura.hr>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 04/21] of: Move of_modalias() to module.c

Hi Rob,

robh@...nel.org wrote on Tue, 7 Mar 2023 18:23:06 -0600:

> On Tue, Mar 07, 2023 at 05:53:42PM +0100, Miquel Raynal wrote:
> > Create a specific .c file for of related module handling.
> > Move of_modalias() inside as a first step.  
> 
> Perhaps a comment as to why it needs to be public? Or is it just shared 
> within the DT core? If so, we have of_private.h for that.

Good point. This helper is actually only used internally (was static
before). At first I wanted to convert all users to use the "new" OF
module-related helpers, but unfortunately, the "dev->of_node_reused"
check makes this impossible. I thus need to keep a few users of
of_modalias() in of_device.h in the coming patches. I could move
of_modalias() to of_private.h but that would mean exposing all the
internals and private definitions to the drivers including of_device.h,
which seemed extremely unsatisfying to me.

I've updated the commit log with:

    The helper is exposed through of.h even though it is only used by core
    files because the users from device.c will soon be split into an OF-only
    helper in module.c as well as a device-oriented inline helper in
    of_device.h. Putting this helper in of_private.h would require to
    include of_private.h from of_device.h, which is not acceptable.

> 
> > 
> > Suggested-by: Rob Herring <robh+dt@...nel.org>
> > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > ---
> >  drivers/of/Makefile |  2 +-
> >  drivers/of/device.c | 37 -------------------------------------
> >  drivers/of/module.c | 43 +++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/of.h  |  8 ++++++++
> >  4 files changed, 52 insertions(+), 38 deletions(-)
> >  create mode 100644 drivers/of/module.c
> > 
> > diff --git a/drivers/of/Makefile b/drivers/of/Makefile
> > index e0360a44306e..ae9923fd2940 100644
> > --- a/drivers/of/Makefile
> > +++ b/drivers/of/Makefile
> > @@ -1,5 +1,5 @@
> >  # SPDX-License-Identifier: GPL-2.0
> > -obj-y = base.o device.o platform.o property.o
> > +obj-y = base.o device.o module.o platform.o property.o
> >  obj-$(CONFIG_OF_KOBJ) += kobj.o
> >  obj-$(CONFIG_OF_DYNAMIC) += dynamic.o
> >  obj-$(CONFIG_OF_FLATTREE) += fdt.o
> > diff --git a/drivers/of/device.c b/drivers/of/device.c
> > index 2bbb67798916..44f1f2ef12b7 100644
> > --- a/drivers/of/device.c
> > +++ b/drivers/of/device.c

[...]

> > diff --git a/drivers/of/module.c b/drivers/of/module.c
> > new file mode 100644
> > index 000000000000..9c6a53f32c0f
> > --- /dev/null
> > +++ b/drivers/of/module.c
> > @@ -0,0 +1,43 @@
> > +// SPDX-License-Identifier: GPL-2.0+  
> 
> Existing license was GPL-2.0 (-only).

Oh right, I took the license from base.c, you're right I should have
taken the one from device.c.

Thanks,
Miquèl