From: Marcel Ziswiler <marcel.ziswiler@toradex.com>
To: "linux@armlinux.org.uk" <linux@armlinux.org.uk>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"jonathanh@nvidia.com" <jonathanh@nvidia.com>,
"robert.jarzmik@free.fr" <robert.jarzmik@free.fr>,
"aaro.koskinen@iki.fi" <aaro.koskinen@iki.fi>,
"jacopo@jmondi.org" <jacopo@jmondi.org>,
"linus.walleij@linaro.org" <linus.walleij@linaro.org>,
"m.szyprowski@samsung.com" <m.szyprowski@samsung.com>,
"broonie@kernel.org" <broonie@kernel.org>,
"shc_work@mail.ru" <shc_work@mail.ru>,
"haojian.zhuang@gmail.com" <haojian.zhuang@gmail.com>,
"lgirdwood@gmail.com" <lgirdwood@gmail.com>,
"rppt@linux.vnet.ibm.com" <rppt@linux.vnet.ibm.com>,
"zonque@gmail.com" <zonque@gmail.com>,
"marc.zyngier@arm.com" <marc.zyngier@arm.com>,
"philipp.zabel@gmail.com" <philipp.zabel@gmail.com>,
"linux-tegra@vger.kernel.org" <linux-tegra@>
Subject: Re: [PATCH v7] regulator: fixed: Convert to use GPIO descriptor only
Date: Fri, 12 Oct 2018 13:13:43 +0000 [thread overview]
Message-ID: <1539350021.30485.45.camel@toradex.com> (raw)
In-Reply-To: <20181012125911.GT30658@n2100.armlinux.org.uk>
On Fri, 2018-10-12 at 13:59 +0100, Russell King - ARM Linux wrote:
> On Fri, Oct 12, 2018 at 11:43:13AM +0000, Marcel Ziswiler wrote:
> > I don't think it is that fictitious as it makes it crystal clear
> > that
> > there is something shared with all its pros and cons. E.g. what
> > happens
> > if one of them regulators wants to turn off while the other one
> > still
> > needs power? The regular regulator dependency tree would nicely
> > make
> > this all clear.
>
> If you're introducing a regulator that doesn't exist in reality
> just to be able to share a GPIO line that is wired to several
> real regulators, then it _is_ ficticious. You're not describing
> the hardware, you're describing something else to work around the
> shortcomings of the implementation that can't cope with how stuff
> is wired up in the real world. You're making the DT description
> fit the software implementation, rather than the software
> implementation fit the real world hardware.
>
> Having a single GPIO that controls multiple separate regulators
> which have entirely separate supplies of their own is very common
> in electronics.
Sure, fine. I will drop it. Thanks!
WARNING: multiple messages have this Message-ID (diff)
From: Marcel Ziswiler <marcel.ziswiler@toradex.com>
To: "linux@armlinux.org.uk" <linux@armlinux.org.uk>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"jonathanh@nvidia.com" <jonathanh@nvidia.com>,
"robert.jarzmik@free.fr" <robert.jarzmik@free.fr>,
"aaro.koskinen@iki.fi" <aaro.koskinen@iki.fi>,
"jacopo@jmondi.org" <jacopo@jmondi.org>,
"linus.walleij@linaro.org" <linus.walleij@linaro.org>,
"m.szyprowski@samsung.com" <m.szyprowski@samsung.com>,
"broonie@kernel.org" <broonie@kernel.org>,
"shc_work@mail.ru" <shc_work@mail.ru>,
"haojian.zhuang@gmail.com" <haojian.zhuang@gmail.com>,
"lgirdwood@gmail.com" <lgirdwood@gmail.com>,
"rppt@linux.vnet.ibm.com" <rppt@linux.vnet.ibm.com>,
"zonque@gmail.com" <zonque@gmail.com>,
"marc.zyngier@arm.com" <marc.zyngier@arm.com>,
"philipp.zabel@gmail.com" <philipp.zabel@gmail.com>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"jmkrzyszt@gmail.com" <jmkrzyszt@gmail.com>,
"geert+renesas@glider.be" <geert+renesas@glider.be>
Subject: Re: [PATCH v7] regulator: fixed: Convert to use GPIO descriptor only
Date: Fri, 12 Oct 2018 13:13:43 +0000 [thread overview]
Message-ID: <1539350021.30485.45.camel@toradex.com> (raw)
In-Reply-To: <20181012125911.GT30658@n2100.armlinux.org.uk>
On Fri, 2018-10-12 at 13:59 +0100, Russell King - ARM Linux wrote:
> On Fri, Oct 12, 2018 at 11:43:13AM +0000, Marcel Ziswiler wrote:
> > I don't think it is that fictitious as it makes it crystal clear
> > that
> > there is something shared with all its pros and cons. E.g. what
> > happens
> > if one of them regulators wants to turn off while the other one
> > still
> > needs power? The regular regulator dependency tree would nicely
> > make
> > this all clear.
>
> If you're introducing a regulator that doesn't exist in reality
> just to be able to share a GPIO line that is wired to several
> real regulators, then it _is_ ficticious. You're not describing
> the hardware, you're describing something else to work around the
> shortcomings of the implementation that can't cope with how stuff
> is wired up in the real world. You're making the DT description
> fit the software implementation, rather than the software
> implementation fit the real world hardware.
>
> Having a single GPIO that controls multiple separate regulators
> which have entirely separate supplies of their own is very common
> in electronics.
Sure, fine. I will drop it. Thanks!
next prev parent reply other threads:[~2018-10-12 13:13 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-06 12:24 [PATCH v7] regulator: fixed: Convert to use GPIO descriptor only Linus Walleij
2018-09-10 17:01 ` Janusz Krzysztofik
2018-09-11 16:06 ` Mike Rapoport
2018-09-28 23:32 ` John Stultz
2018-09-29 17:38 ` Linus Walleij
2018-10-01 18:53 ` Leonard Crestez
2018-10-01 20:16 ` Linus Walleij
2018-10-01 20:37 ` Fabio Estevam
2018-10-01 20:48 ` Linus Walleij
[not found] ` <CGME20181011090112eucas1p286d8c1edfc1a2a207d8a11c5ad7eb20e@eucas1p2.samsung.com>
2018-10-11 9:01 ` Marek Szyprowski
2018-10-11 9:29 ` Linus Walleij
2018-10-11 9:46 ` Marek Szyprowski
2018-10-11 13:15 ` Mark Brown
2018-10-11 15:00 ` Jon Hunter
2018-10-11 15:34 ` Marcel Ziswiler
2018-10-11 15:34 ` Marcel Ziswiler
2018-10-11 17:47 ` Linus Walleij
2018-10-12 9:43 ` Marcel Ziswiler
2018-10-12 9:43 ` Marcel Ziswiler
2018-10-12 10:39 ` Jon Hunter
2018-10-12 10:39 ` Jon Hunter
2018-10-12 10:43 ` Russell King - ARM Linux
2018-10-12 10:43 ` Russell King - ARM Linux
2018-10-12 11:03 ` Linus Walleij
2018-10-12 11:43 ` Marcel Ziswiler
2018-10-12 11:43 ` Marcel Ziswiler
2018-10-12 12:59 ` Russell King - ARM Linux
2018-10-12 12:59 ` Russell King - ARM Linux
2018-10-12 13:13 ` Marcel Ziswiler [this message]
2018-10-12 13:13 ` Marcel Ziswiler
2018-10-12 16:57 ` Mark Brown
2018-10-12 16:57 ` Mark Brown
2018-10-12 13:58 ` Andy Shevchenko
2018-10-12 16:17 ` Mark Brown
2018-10-11 17:45 ` Linus Walleij
2018-10-12 10:25 ` Jon Hunter
2018-10-12 10:25 ` Jon Hunter
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