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From: Frieder Schrempf <frieder.schrempf@kontron.de>
To: Michael Walle <michael@walle.cc>, Heiko Thiery <heiko.thiery@gmail.com>
Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Joakim Zhang <qiangqing.zhang@nxp.com>,
	Shengjiu Wang <shengjiu.wang@nxp.com>,
	Rob Herring <robh+dt@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>
Subject: Re: [PATCH] arm64: dts: imx8mm-kontron-n801x-som: do not allow to switch off buck2
Date: Wed, 15 Sep 2021 14:09:06 +0200	[thread overview]
Message-ID: <898fd5e0-2073-3689-89b6-2c5071773786@kontron.de> (raw)
In-Reply-To: <7e7ee4244ababc0a46e0875222c7e37d@walle.cc>

On 15.09.21 14:05, Michael Walle wrote:
> Am 2021-09-15 14:03, schrieb Heiko Thiery:
>> The buck2 output of the PMIC is the VDD core voltage of the cpu.
>> Switching off this will poweroff the CPU. Add the 'regulator-always-on'
>> property to avoid this.
> 
> Mh, have this ever worked? Is there a commit which introduced a regression?

Yes, this did work before, even without 'regulator-always-on'. I
currently don't understand why this is needed. The regulator is
referenced in the CPU nodes as 'cpu-supply'. This should be enough to
not disable it as long as the CPU is up.

WARNING: multiple messages have this Message-ID (diff)
From: Frieder Schrempf <frieder.schrempf@kontron.de>
To: Michael Walle <michael@walle.cc>, Heiko Thiery <heiko.thiery@gmail.com>
Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Joakim Zhang <qiangqing.zhang@nxp.com>,
	Shengjiu Wang <shengjiu.wang@nxp.com>,
	Rob Herring <robh+dt@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>
Subject: Re: [PATCH] arm64: dts: imx8mm-kontron-n801x-som: do not allow to switch off buck2
Date: Wed, 15 Sep 2021 14:09:06 +0200	[thread overview]
Message-ID: <898fd5e0-2073-3689-89b6-2c5071773786@kontron.de> (raw)
In-Reply-To: <7e7ee4244ababc0a46e0875222c7e37d@walle.cc>

On 15.09.21 14:05, Michael Walle wrote:
> Am 2021-09-15 14:03, schrieb Heiko Thiery:
>> The buck2 output of the PMIC is the VDD core voltage of the cpu.
>> Switching off this will poweroff the CPU. Add the 'regulator-always-on'
>> property to avoid this.
> 
> Mh, have this ever worked? Is there a commit which introduced a regression?

Yes, this did work before, even without 'regulator-always-on'. I
currently don't understand why this is needed. The regulator is
referenced in the CPU nodes as 'cpu-supply'. This should be enough to
not disable it as long as the CPU is up.

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

  reply	other threads:[~2021-09-15 12:09 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-15 12:03 [PATCH] arm64: dts: imx8mm-kontron-n801x-som: do not allow to switch off buck2 Heiko Thiery
2021-09-15 12:03 ` Heiko Thiery
2021-09-15 12:05 ` Michael Walle
2021-09-15 12:05   ` Michael Walle
2021-09-15 12:09   ` Frieder Schrempf [this message]
2021-09-15 12:09     ` Frieder Schrempf
2021-09-17  7:28     ` Heiko Thiery
2021-09-17  7:28       ` Heiko Thiery
2021-09-17  8:21       ` Michael Walle
2021-09-17  8:21         ` Michael Walle
2021-09-17  8:51         ` Heiko Thiery
2021-09-17  8:51           ` Heiko Thiery
2021-09-17 11:44       ` Lucas Stach
2021-09-17 11:44         ` Lucas Stach
2021-09-17 16:10         ` Heiko Thiery
2021-09-17 16:10           ` Heiko Thiery
2021-09-20  7:31           ` Frieder Schrempf
2021-09-20  7:31             ` Frieder Schrempf
2021-09-20  7:43             ` Michael Walle
2021-09-20  7:43               ` Michael Walle
2021-09-20  8:10               ` Lucas Stach
2021-09-20  8:10                 ` Lucas Stach
2021-10-04 12:39 ` Shawn Guo
2021-10-04 12:39   ` Shawn Guo

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