linux-kernel - Re: [PATCH v2 2/2] of: changesets: Introduce changeset helper methods

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Date:	Mon, 21 Sep 2015 15:49:07 +0300
From:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Rob Herring <robherring2@...il.com>,
	Frank Rowand <frowand.list@...il.com>,
	Matt Porter <mporter@...sulko.com>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Guenter Roeck <linux@...ck-us.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] of: changesets: Introduce changeset helper methods

Hi Geert,

> On Sep 21, 2015, at 15:47 , Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> 
> Hi Pantelis,
> 
> On Mon, Sep 21, 2015 at 2:36 PM, Pantelis Antoniou
> <pantelis.antoniou@...sulko.com> wrote:
>>> On Sep 21, 2015, at 15:35 , Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>>> On Wed, Sep 16, 2015 at 6:11 PM, Pantelis Antoniou
>>> <pantelis.antoniou@...sulko.com> wrote:
>>>> Changesets are very powerful, but the lack of a helper API
>>>> makes using them cumbersome. Introduce a simple copy based
>>>> API that makes things considerably easier.
>>>> 
>>>> To wit, adding a property using the raw API.
>>>> 
>>>>       struct property *prop;
>>>>       prop = kzalloc(sizeof(*prop)), GFP_KERNEL);
>>>>       prop->name = kstrdup("compatible");
>>>>       prop->value = kstrdup("foo,bar");
>>>>       prop->length = strlen(prop->value) + 1;
>>>>       of_changeset_add_property(ocs, np, prop);
>>>> 
>>>> while using the helper API
>>>> 
>>>>       of_changeset_add_property_string(ocs, np, "compatible",
>>>>                       "foo,bar");
>>> 
>>> What about removing properties?
>> 
>> Once upon a time there was that capability. It was removed after we didn’t have
>> a good use for them yet. Do you have any? I’d be happy to re-add it :)
> 
> Aliases?
> 
> If an overlay removes e.g. a serial port, it should remove its alias, too.
> 

Well, that case is handled. Addition of a property results in removal of a property when
the overlay is reverted.

This is an accessor API that makes things simpler than what’s internally used at
overlays.

We’re talking about removal of a property/node as part of application.

> Gr{oetje,eeting}s,
> 
>                        Geert
> 

Regards

— Pantelis

> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                -- Linus Torvalds

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