linux-kernel - Re: Regulator probe on demand (or circular dependencies)

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Date:   Thu, 12 Dec 2019 17:18:43 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Kieran Bingham <kieran.bingham@...asonboard.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Niklas Söderlund <niklas.soderlund@...natech.se>
Subject: Re: Regulator probe on demand (or circular dependencies)

Hi Mark,

On Thu, Dec 12, 2019 at 4:57 PM Mark Brown <broonie@...nel.org> wrote:
> On Wed, Dec 11, 2019 at 10:42:43PM +0000, Kieran Bingham wrote:
 sort of wondering if something like this could optimise away some
> > of the -EPROBE_DEFER iterations at a more global level, but I don't know
> > how or if that would work anyway.
>
> In theory someone could try to do some sort of sorting with the DT
> graph, people keep talking about it but nobody's done anything that I'm
> aware of.

"of_devlink" has landed in v5.5-rc1, cfr. commit a3e1d1a7f5fcccaf ("of:
property: Add functional dependency link from DT bindings").

I gave it a try on some boards lately.  It improved the deferral situation on
Koelsch, but made it worse on Salvator-XS.

Gr{oetje,eeting}s,

                        Geert

-- 
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