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From: Mark Brown <broonie@kernel.org>
To: Michael Riesch <michael.riesch@wolfvision.net>
Cc: Robin Murphy <robin.murphy@arm.com>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	linux-rockchip@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Heiko Stuebner <heiko@sntech.de>,
	kernel@pengutronix.de
Subject: Re: [PATCH 3/4] soc: rockchip: power-domain: Add regulator support
Date: Wed, 22 Dec 2021 13:40:50 +0000	[thread overview]
Message-ID: <YcMq4vF7yKn7iu5U@sirena.org.uk> (raw)
In-Reply-To: <73caef1d-7e55-57f5-5912-b056fff73a06@wolfvision.net>


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On Wed, Dec 22, 2021 at 02:29:23PM +0100, Michael Riesch wrote:
> On 12/22/21 2:25 PM, Mark Brown wrote:

> > In that case I would tend to assume that unless otherwise stated it's
> > safer to keep the supply enabled when everything else is enabled.  It's
> > the default thing and so is more likely to be what was designed for and
> > less likely to result in nasty surprises.

> Based on my experience with the RK3568 EVB1 the vdd_gpu supply turns
> after startup if it is unused and the SoC works fine. Let's take the
> energy efficient route here :-)

One of the issues is that it may not actually be energy efficient if it
ends up leaking current through the SoC from the other supplies (and
long term that leakage probably won't do any good for hardware).  A very
lightly loaded regulator can be the better option.

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WARNING: multiple messages have this Message-ID
From: Mark Brown <broonie@kernel.org>
To: Michael Riesch <michael.riesch@wolfvision.net>
Cc: Robin Murphy <robin.murphy@arm.com>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	linux-rockchip@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Heiko Stuebner <heiko@sntech.de>,
	kernel@pengutronix.de
Subject: Re: [PATCH 3/4] soc: rockchip: power-domain: Add regulator support
Date: Wed, 22 Dec 2021 13:40:50 +0000	[thread overview]
Message-ID: <YcMq4vF7yKn7iu5U@sirena.org.uk> (raw)
In-Reply-To: <73caef1d-7e55-57f5-5912-b056fff73a06@wolfvision.net>


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On Wed, Dec 22, 2021 at 02:29:23PM +0100, Michael Riesch wrote:
> On 12/22/21 2:25 PM, Mark Brown wrote:

> > In that case I would tend to assume that unless otherwise stated it's
> > safer to keep the supply enabled when everything else is enabled.  It's
> > the default thing and so is more likely to be what was designed for and
> > less likely to result in nasty surprises.

> Based on my experience with the RK3568 EVB1 the vdd_gpu supply turns
> after startup if it is unused and the SoC works fine. Let's take the
> energy efficient route here :-)

One of the issues is that it may not actually be energy efficient if it
ends up leaking current through the SoC from the other supplies (and
long term that leakage probably won't do any good for hardware).  A very
lightly loaded regulator can be the better option.

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_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2021-12-22 13:41 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-17 13:09 [PATCH 0/4] " Sascha Hauer
2021-12-17 13:09 ` Sascha Hauer
2021-12-17 13:09 ` [PATCH 1/4] soc: rockchip: power-domain: register device for each domain Sascha Hauer
2021-12-17 13:09   ` Sascha Hauer
2021-12-17 13:09 ` [PATCH 2/4] soc: rockchip: power-domain: Use devm_clk_bulk_get_all() Sascha Hauer
2021-12-17 13:09   ` Sascha Hauer
2021-12-17 13:09 ` [PATCH 3/4] soc: rockchip: power-domain: Add regulator support Sascha Hauer
2021-12-17 13:09   ` Sascha Hauer
2021-12-20  9:44   ` Sascha Hauer
2021-12-20  9:44     ` Sascha Hauer
2021-12-20 10:46     ` Robin Murphy
2021-12-20 10:46       ` Robin Murphy
2021-12-20 12:56       ` Mark Brown
2021-12-20 12:56         ` Mark Brown
2021-12-20 12:53     ` Mark Brown
2021-12-20 12:53       ` Mark Brown
2021-12-22 10:40       ` Sascha Hauer
2021-12-22 10:40         ` Sascha Hauer
2021-12-22 12:54         ` Robin Murphy
2021-12-22 12:54           ` Robin Murphy
2021-12-22 13:00           ` Mark Brown
2021-12-22 13:00             ` Mark Brown
2021-12-22 13:19             ` Robin Murphy
2021-12-22 13:19               ` Robin Murphy
2021-12-22 13:25               ` Mark Brown
2021-12-22 13:25                 ` Mark Brown
2021-12-22 13:29                 ` Michael Riesch
2021-12-22 13:29                   ` Michael Riesch
2021-12-22 13:37                   ` Michael Riesch
2021-12-22 13:40                   ` Mark Brown [this message]
2021-12-22 13:40                     ` Mark Brown
2022-02-23  8:51                     ` Michael Riesch
2022-02-23  8:51                       ` Michael Riesch
2021-12-17 13:09 ` [PATCH 4/4] dt-bindings: power: rockchip: Add power-supply to domain nodes Sascha Hauer
2021-12-17 13:09   ` Sascha Hauer

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