From: Shawn Guo <shawnguo@kernel.org>
To: Frieder Schrempf <frieder.schrempf@kontron.de>
Cc: Frieder Schrempf <frieder@fris.de>,
devicetree@vger.kernel.org, Krzysztof Kozlowski <krzk@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
stable@vger.kernel.org, Fabio Estevam <festevam@gmail.com>,
NXP Linux Team <linux-imx@nxp.com>,
Pengutronix Kernel Team <kernel@pengutronix.de>
Subject: Re: [PATCH 3/8] arm64: dts: imx8mm-kontron: Set VDD_SNVS to 800 mV
Date: Fri, 15 Oct 2021 12:04:51 +0800 [thread overview]
Message-ID: <20211015040450.GF22881@dragon> (raw)
In-Reply-To: <df454b06-3069-d369-e3c7-f2434d94f4af@kontron.de>
On Tue, Oct 05, 2021 at 03:14:40PM +0200, Frieder Schrempf wrote:
> On 05.10.21 08:56, Shawn Guo wrote:
> > On Thu, Sep 30, 2021 at 05:56:26PM +0200, Frieder Schrempf wrote:
> >> From: Frieder Schrempf <frieder.schrempf@kontron.de>
> >>
> >> According to the datasheet VDD_SNVS should be 800 mV, so let's
> >> make sure that the voltage won't be different.
> >
> > Could you share the datasheet?
>
> Sure, it's here: https://www.nxp.com/docs/en/data-sheet/IMX8MMIEC.pdf.
> See table 10 for the operating voltages.
Thanks for the link!
But datasheet specifies a voltage range. 800 mV is just the typical one.
The only problem I see is that regulator-min-microvolt should be lowered
to 800 mV. regulator-max-microvolt looks correct to me.
Shawn
>
> >>
> >> Fixes: 21c4f45b335f ("arm64: dts: Add the Kontron i.MX8M Mini SoMs and baseboards")
> >> Cc: stable@vger.kernel.org
> >> Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
> >> ---
> >> arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi | 4 ++--
> >> 1 file changed, 2 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
> >> index b12fb7ce6686..213014f59b46 100644
> >> --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
> >> +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
> >> @@ -152,8 +152,8 @@ reg_nvcc_snvs: LDO1 {
> >>
> >> reg_vdd_snvs: LDO2 {
> >> regulator-name = "ldo2";
> >> - regulator-min-microvolt = <850000>;
> >> - regulator-max-microvolt = <900000>;
> >> + regulator-min-microvolt = <800000>;
> >> + regulator-max-microvolt = <800000>;
> >> regulator-boot-on;
> >> regulator-always-on;
> >> };
> >> --
> >> 2.33.0
> >>
next prev parent reply other threads:[~2021-10-15 4:05 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-30 15:56 [PATCH 0/8] Devicetree fixes and additions for Kontron SL/BL i.MX8MM boards Frieder Schrempf
2021-09-30 15:56 ` [PATCH 1/8] arm64: dts: imx8mm-kontron: Add support for ultra high speed modes on SD card Frieder Schrempf
2021-10-05 6:45 ` Shawn Guo
2021-10-15 10:44 ` Frieder Schrempf
2021-09-30 15:56 ` [PATCH 2/8] arm64: dts: imx8mm-kontron: Make sure SOC and DRAM supply voltages are correct Frieder Schrempf
2021-09-30 16:02 ` Frieder Schrempf
2021-10-05 6:49 ` Shawn Guo
2021-10-05 6:53 ` Shawn Guo
2021-10-05 13:10 ` Frieder Schrempf
2021-10-15 3:51 ` Shawn Guo
2021-09-30 15:56 ` [PATCH 3/8] arm64: dts: imx8mm-kontron: Set VDD_SNVS to 800 mV Frieder Schrempf
2021-10-05 6:56 ` Shawn Guo
2021-10-05 13:14 ` Frieder Schrempf
2021-10-15 4:04 ` Shawn Guo [this message]
2021-09-30 15:56 ` [PATCH 4/8] arm64: dts: imx8mm-kontron: Fix reg_rst_eth2 and reg_vdd_5v regulators Frieder Schrempf
2021-10-05 7:09 ` Shawn Guo
2021-10-05 17:06 ` Frieder Schrempf
2021-10-15 4:09 ` Shawn Guo
2021-10-15 11:32 ` Frieder Schrempf
2021-09-30 15:56 ` [PATCH 5/8] arm64: dts: imx8mm-kontron: Fix CAN SPI clock frequency Frieder Schrempf
2021-10-05 7:12 ` Shawn Guo
2021-10-05 17:17 ` Frieder Schrempf
2021-10-15 4:12 ` Shawn Guo
2021-09-30 15:56 ` [PATCH 6/8] arm64: dts: imx8mm-kontron: Fix connection type for VSC8531 RGMII PHY Frieder Schrempf
2021-10-05 7:20 ` Shawn Guo
2021-09-30 15:56 ` [PATCH 7/8] arm64: dts: imx8mm-kontron: Fix reset delays for ethernet PHY Frieder Schrempf
2021-09-30 15:56 ` [PATCH 8/8] arm64: dts: imx8mm-kontron: Leave reg_vdd_arm always powered on Frieder Schrempf
2021-09-30 18:52 ` Heiko Thiery
2021-10-05 7:27 ` Shawn Guo
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