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From: Michael Riesch <michael.riesch@wolfvision.net>
To: Mark Brown <broonie@kernel.org>, Robin Murphy <robin.murphy@arm.com>
Cc: 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 14:29:23 +0100	[thread overview]
Message-ID: <73caef1d-7e55-57f5-5912-b056fff73a06@wolfvision.net> (raw)
In-Reply-To: <YcMnNXu9Iun71uCG@sirena.org.uk>

Hi Robin and Mark,

On 12/22/21 2:25 PM, Mark Brown wrote:
> On Wed, Dec 22, 2021 at 01:19:23PM +0000, Robin Murphy wrote:
>> On 2021-12-22 13:00, Mark Brown wrote:
> 
>>> Does the SoC actually support the supply being completely off in
>>> operation?  A lot of devices want everything powered even if idle during
>>> full operation since keeping voltage differentials smaller makes it a
>>> lot easier to design to avoid leakage current type issues at the points
>>> where the different power domains connect.
> 
>> I don't know TBH - the available documentation doesn't seem to go into quite
>> that much detail.
> 
> 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 :-)

Best regards,
Michael

_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip

WARNING: multiple messages have this Message-ID
From: Michael Riesch <michael.riesch@wolfvision.net>
To: Mark Brown <broonie@kernel.org>, Robin Murphy <robin.murphy@arm.com>
Cc: 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 14:29:23 +0100	[thread overview]
Message-ID: <73caef1d-7e55-57f5-5912-b056fff73a06@wolfvision.net> (raw)
In-Reply-To: <YcMnNXu9Iun71uCG@sirena.org.uk>

Hi Robin and Mark,

On 12/22/21 2:25 PM, Mark Brown wrote:
> On Wed, Dec 22, 2021 at 01:19:23PM +0000, Robin Murphy wrote:
>> On 2021-12-22 13:00, Mark Brown wrote:
> 
>>> Does the SoC actually support the supply being completely off in
>>> operation?  A lot of devices want everything powered even if idle during
>>> full operation since keeping voltage differentials smaller makes it a
>>> lot easier to design to avoid leakage current type issues at the points
>>> where the different power domains connect.
> 
>> I don't know TBH - the available documentation doesn't seem to go into quite
>> that much detail.
> 
> 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 :-)

Best regards,
Michael

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

  reply	other threads:[~2021-12-22 13:30 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 [this message]
2021-12-22 13:29                   ` Michael Riesch
2021-12-22 13:37                   ` Michael Riesch
2021-12-22 13:40                   ` Mark Brown
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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