mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Sascha Hauer <s.hauer@pengutronix.de>
To: Michael Riesch <michael.riesch@wolfvision.net>
Cc: Barebox List <barebox@lists.infradead.org>
Subject: Re: [PATCH v3 7/7] of_overlay: Add option to apply overlay to live tree
Date: Tue, 14 Mar 2023 16:49:04 +0100	[thread overview]
Message-ID: <20230314154904.GK7446@pengutronix.de> (raw)
In-Reply-To: <2b5df3a5-37f1-44f2-12f4-1bb6f2a0f379@wolfvision.net>

On Tue, Mar 14, 2023 at 03:59:29PM +0100, Michael Riesch wrote:
> Hi Sascha,
> 
> On 3/10/23 10:42, Sascha Hauer wrote:
> > The of_overlay command currently only supports applying overlays to the
> > Linux device tree. Add an option to apply an overlay to the live tree.
> > Using this option will apply the overlay and also triggers rescanning
> > the device tree in case new devices have been added.
> > 
> > Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> > ---
> >  commands/of_overlay.c | 38 ++++++++++++++++++++++++++++++++++----
> >  1 file changed, 34 insertions(+), 4 deletions(-)
> > 
> > diff --git a/commands/of_overlay.c b/commands/of_overlay.c
> > index b3660b4bf1..1d68e31ef2 100644
> > --- a/commands/of_overlay.c
> > +++ b/commands/of_overlay.c
> > @@ -17,10 +17,20 @@ static int do_of_overlay(int argc, char *argv[])
> >  	struct fdt_header *fdt;
> >  	struct device_node *overlay;
> >  	size_t size;
> > +	bool live_tree = false;
> > +	int opt;
> >  
> > -	if (argc != 2)
> > +	if (argc < 2)
> >  		return COMMAND_ERROR_USAGE;
> >  
> > +	while ((opt = getopt(argc, argv, "l")) > 0) {
> > +		switch (opt) {
> > +		case 'l':
> > +			live_tree = true;
> > +			break;
> > +		}
> > +	}
> > +
> >  	fdt = read_file(argv[optind], &size);
> 
> of course this is not the intended usage, but "of_overlay -l" (i.e.,
> skipping the overlay argument) throws an exception.

Okay, will fix.

> 
> >  	if (!fdt) {
> >  		printf("cannot read %s\n", argv[optind]);
> > @@ -32,7 +42,14 @@ static int do_of_overlay(int argc, char *argv[])
> >  	if (IS_ERR(overlay))
> >  		return PTR_ERR(overlay);
> >  
> > -	ret = of_register_overlay(overlay);
> > +	if (live_tree) {
> > +		ret = of_overlay_apply_tree(of_get_root_node(), overlay);
> 
> If I pass a meaningful argument ("of_overlay -l path_to_my_overlay"), I get
> 
> ERROR: of_resolver: __symbols__ missing from base devicetree
> cannot apply oftree overlay: Invalid argument
> of_overlay: Invalid argument
> 
> in return. The base device tree does not contain any __symbols__
> sections indeed. How can I activate the generation of this section?

Please enable CONFIG_OF_OVERLAY_LIVE. Maybe we can improve this a bit to
make this clearer somehow / somewhere,

Sascha

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |



  reply	other threads:[~2023-03-14 15:50 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-10  9:42 [PATCH v3 0/7] support overlays to the barebox " Sascha Hauer
2023-03-10  9:42 ` [PATCH v3 1/7] kbuild: Add target to build dtb overlay files Sascha Hauer
2023-03-10  9:42 ` [PATCH v3 2/7] driver: Add rescan hook to struct device Sascha Hauer
2023-03-10  9:42 ` [PATCH v3 3/7] i2c: implement rescan Sascha Hauer
2023-03-10  9:42 ` [PATCH v3 4/7] spi: Directly register SPI device Sascha Hauer
2023-03-10  9:42 ` [PATCH v3 5/7] spi: reduce scope of 'chip' Sascha Hauer
2023-03-10  9:42 ` [PATCH v3 6/7] spi: implement rescan Sascha Hauer
2023-03-10  9:42 ` [PATCH v3 7/7] of_overlay: Add option to apply overlay to live tree Sascha Hauer
2023-03-14 14:59   ` Michael Riesch
2023-03-14 15:49     ` Sascha Hauer [this message]
2023-03-14 16:03       ` Michael Riesch
2023-03-15 16:09 ` [PATCH v3 0/7] support overlays to the barebox " Michael Riesch
2023-03-16  8:58   ` Sascha Hauer

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20230314154904.GK7446@pengutronix.de \
    --to=s.hauer@pengutronix.de \
    --cc=barebox@lists.infradead.org \
    --cc=michael.riesch@wolfvision.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox