[U-Boot] [PATCH 01/10] dm: fdt: scan for devices under /firmware too

[Tom Rini <trini@konsulko.com>]

On Wed, Aug 15, 2018 at 04:30:15PM +0200, Michal Simek wrote:
> On 15.8.2018 16:17, Tom Rini wrote:
> > On Mon, Aug 13, 2018 at 05:53:38PM +0200, Jens Wiklander wrote:
> > 
> >> Just as /chosen may contain devices /firmware may contain devices, scan
> >> for devices under /firmware too.
> >>
> >> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
> >> ---
> >>  drivers/core/root.c | 15 ++++++++++-----
> >>  1 file changed, 10 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/drivers/core/root.c b/drivers/core/root.c
> >> index 72bcc7d7f2a3..0dca507e1187 100644
> >> --- a/drivers/core/root.c
> >> +++ b/drivers/core/root.c
> >> @@ -265,9 +265,15 @@ static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
> >>  	for (offset = fdt_first_subnode(blob, offset);
> >>  	     offset > 0;
> >>  	     offset = fdt_next_subnode(blob, offset)) {
> >> -		/* "chosen" node isn't a device itself but may contain some: */
> >> -		if (!strcmp(fdt_get_name(blob, offset, NULL), "chosen")) {
> >> -			pr_debug("parsing subnodes of \"chosen\"\n");
> >> +		const char *node_name = fdt_get_name(blob, offset, NULL);
> >> +
> >> +		/*
> >> +		 * The "chosen" and "firmware" nodes aren't devices
> >> +		 * themselves but may contain some:
> >> +		 */
> >> +		if (!strcmp(node_name, "chosen") ||
> >> +		    !strcmp(node_name, "firmware")) {
> >> +			pr_debug("parsing subnodes of \"%s\"\n", node_name);
> >>  
> >>  			err = dm_scan_fdt_node(parent, blob, offset,
> >>  					       pre_reloc_only);
> > 
> > So, the /firmware node seems special.  Have you talked with the
> > devicetree folks to get it listed in the spec?  That would seem rather
> > valuable for something used by many parties.  Thanks!
> > 
> 
> some days ago we have sent a patch for this too.
> https://lists.denx.de/pipermail/u-boot/2018-August/338049.html
> 
> It is using different way but it should do the same thing.

OK, so it sounds like in terms of code clean-ups, we need something like
what you reference and then some further clean-ups on top of that
perhaps for other places to call dm_scan_fdt_ofnode_path() for special
cases.  And in terms of formalized specification bits, I do think
/firmware should perhaps get kicked up to the spec itself so that it's
very clear to all consumers.

-- 
Tom
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