linux-kernel - Re: [PATCH v7] regulator: fixed: Convert to use GPIO descriptor only

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Date:   Fri, 12 Oct 2018 09:43:37 +0000
From:   Marcel Ziswiler <marcel.ziswiler@...adex.com>
To:     "linus.walleij@...aro.org" <linus.walleij@...aro.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "robert.jarzmik@...e.fr" <robert.jarzmik@...e.fr>,
        "aaro.koskinen@....fi" <aaro.koskinen@....fi>,
        "jacopo@...ndi.org" <jacopo@...ndi.org>,
        "m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
        "rmk+kernel@...linux.org.uk" <rmk+kernel@...linux.org.uk>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "shc_work@...l.ru" <shc_work@...l.ru>,
        "haojian.zhuang@...il.com" <haojian.zhuang@...il.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "rppt@...ux.vnet.ibm.com" <rppt@...ux.vnet.ibm.com>,
        "zonque@...il.com" <zonque@...il.com>,
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        "philipp.zabel@...il.com" <philipp.zabel@...il.com>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "jmkrzyszt@...il.com" <jmkrzyszt@...il.com>,
        "geert+renesas@...der.be" <geert+renesas@...der.be>
Subject: Re: [PATCH v7] regulator: fixed: Convert to use GPIO descriptor only

On Thu, 2018-10-11 at 19:47 +0200, Linus Walleij wrote:
> On Thu, Oct 11, 2018 at 5:34 PM Marcel Ziswiler
> <marcel.ziswiler@...adex.com> wrote:
> 
> > I guess that is also what broke HDMI on Apalis/Colibri T30 causing
> > me
> > to submit a fix [1]. I may also help testing.
> 
> I see there are many ways to skin this cat.

Yes, as a matter of fact I screened the kernel concerning this multi
gpio stuff but could not quite find many examples and no mentioning
anywhere whether or not this is actually allowed. So I kind of assumed
that this may just not really be allowed and cooked up my patch which
is anyway kind of a cleaner solution. I mean explicitly modelling the
GPIO into some intermediate regulator supplying the others.

> Does this patch fix things for you as well?
> https://marc.info/?l=linux-kernel&m=153926854327176&w=2

Yes, da-da and HDMI works again. Thanks!

I will still try to get my other patch in as like mentioned above I
feel it is a cleaner solution to our regulator setup.

BTW: Have you heard of lore as well? I believe it is the better mailing
list archive as of today:

https://lore.kernel.org/lkml/20181011143531.7195-1-linus.walleij@linaro
.org/

> Yours,
> Linus Walleij