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Received: from DBBPR08MB4523.eurprd08.prod.outlook.com (2603:10a6:10:c8::19) by DB9PR08MB7008.eurprd08.prod.outlook.com (2603:10a6:10:2c9::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4801.20; Wed, 22 Dec 2021 13:29:25 +0000 Received: from DBBPR08MB4523.eurprd08.prod.outlook.com ([fe80::81d1:d448:4016:1956]) by DBBPR08MB4523.eurprd08.prod.outlook.com ([fe80::81d1:d448:4016:1956%4]) with mapi id 15.20.4801.023; Wed, 22 Dec 2021 13:29:25 +0000 Subject: Re: [PATCH 3/4] soc: rockchip: power-domain: Add regulator support To: Mark Brown , Robin Murphy Cc: Sascha Hauer , linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Heiko Stuebner , kernel@pengutronix.de References: <20211217130919.3035788-1-s.hauer@pengutronix.de> <20211217130919.3035788-4-s.hauer@pengutronix.de> <20211220094435.GU6003@pengutronix.de> <20211222104036.GY6003@pengutronix.de> <04982df2-29a0-86d5-d4a8-05826916d9a0@arm.com> From: Michael Riesch Message-ID: <73caef1d-7e55-57f5-5912-b056fff73a06@wolfvision.net> Date: Wed, 22 Dec 2021 14:29:23 +0100 User-Agent: Mozilla/5.0 (X11; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org 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