linux-kernel - RE: [PATCH v1 2/2] arm64: dts: imx8mn-ddr4-evk: correct ldo1/ldo2 voltage range

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Date:   Thu, 21 May 2020 06:02:24 +0000
From:   Peng Fan <peng.fan@....com>
To:     Robin Gong <yibin.gong@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        Anson Huang <anson.huang@....com>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 2/2] arm64: dts: imx8mn-ddr4-evk: correct ldo1/ldo2
 voltage range

> Subject: [PATCH v1 2/2] arm64: dts: imx8mn-ddr4-evk: correct ldo1/ldo2
> voltage range
> 
> Correct ldo1 voltage range from wrong high group(3.0v~3.3v) to low group
> (1.6v~1.9v) because the ldo1 should be 1.8v. Actually, two voltage groups
> have been supported at bd718x7-regulator driver, hence, just corrrect the
> voltage range to 1.6v~3.3v. For ldo2@...v, correct voltage range too.
> Otherwise, ldo1 would be kept @3.0v and ldo2@...v which violate i.mx8mm
> datasheet as the below warning log in kernel:
> 
> [    0.995524] LDO1: Bringing 1800000uV into 3000000-3000000uV
> [    0.999196] LDO2: Bringing 800000uV into 900000-900000uV
> 
> Signed-off-by: Robin Gong <yibin.gong@....com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts | 4 ++--
>  arch/arm64/boot/dts/freescale/imx8mn-evk.dts      | 9 +++++++++
>  2 files changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
> b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
> index d07e0e6..a1e5483 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
> @@ -113,7 +113,7 @@
> 
>  			ldo1_reg: LDO1 {
>  				regulator-name = "LDO1";
> -				regulator-min-microvolt = <3000000>;
> +				regulator-min-microvolt = <1600000>;
>  				regulator-max-microvolt = <3300000>;
>  				regulator-boot-on;
>  				regulator-always-on;
> @@ -121,7 +121,7 @@
> 
>  			ldo2_reg: LDO2 {
>  				regulator-name = "LDO2";
> -				regulator-min-microvolt = <900000>;
> +				regulator-min-microvolt = <800000>;
>  				regulator-max-microvolt = <900000>;
>  				regulator-boot-on;
>  				regulator-always-on;
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
> b/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
> index 61f3519..117ff4b 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
> @@ -13,6 +13,15 @@
>  	compatible = "fsl,imx8mn-evk", "fsl,imx8mn";  };
> 
> +&ecspi1 {
> +	status = "okay";
> +spidev0: spi@0 {
> +	compatible = "ge,achc";
> +	reg = <0>;
> +	spi-max-frequency = <1000000>;
> +	};
> +};
> +

This was added by mistake?

Regards,
Peng.

>  &A53_0 {
>  	/delete-property/operating-points-v2;
>  };
> --
> 2.7.4