linux-kernel - Re: [PATCH 03/15] arm64: dts: imx8mp-evk: fix BUCK/LDO voltage

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 20 Oct 2022 13:02:57 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de,
        devicetree@...r.kernel.org, Peng Fan <peng.fan@....com>,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        kernel@...gutronix.de, festevam@...il.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 03/15] arm64: dts: imx8mp-evk: fix BUCK/LDO voltage

Hi Peng,

On 22-10-20, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Per PCA9450C datasheet, the voltage range as below:
> BUCK1 0.6 - 2.1875
> BUCK2 0.6 - 2.1875
> BUCK4 0.6 - 3.4
> BUCK5 0.6 - 3.4
> BUCK6 0.6 - 3.4
> 
> LDO1 1.6-1.9, 3.0-3.3
> LDO2 0.8 – 1.15
> LDO3 0.8 - 3.3
> LDO4 0.8 - 3.3
> LDO5 1.8 - 3.3
> 
> So correct them, and also add LDO[2,4]

In the DTS you specify voltage constraints for a specific hardware and
not the one supported by the PMIC. What the PMIC supports (min/max) is
specified within the driver.

Regards,
  Marco

> 
> Fixes: 5497bc2a2bff ("arm64: dts: imx8mp-evk: Add PMIC device")
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 44 +++++++++++++-------
>  1 file changed, 30 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> index b4c1ef2559f2..a4cddc5a8620 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> @@ -248,8 +248,8 @@ pmic@25 {
>  		regulators {
>  			BUCK1 {
>  				regulator-name = "BUCK1";
> -				regulator-min-microvolt = <720000>;
> -				regulator-max-microvolt = <1000000>;
> +				regulator-min-microvolt = <600000>;
> +				regulator-max-microvolt = <2187500>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  				regulator-ramp-delay = <3125>;
> @@ -257,8 +257,8 @@ BUCK1 {
>  
>  			reg_arm: BUCK2 {
>  				regulator-name = "BUCK2";
> -				regulator-min-microvolt = <720000>;
> -				regulator-max-microvolt = <1025000>;
> +				regulator-min-microvolt = <600000>;
> +				regulator-max-microvolt = <2187500>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  				regulator-ramp-delay = <3125>;
> @@ -268,40 +268,56 @@ reg_arm: BUCK2 {
>  
>  			BUCK4 {
>  				regulator-name = "BUCK4";
> -				regulator-min-microvolt = <3000000>;
> -				regulator-max-microvolt = <3600000>;
> +				regulator-min-microvolt = <600000>;
> +				regulator-max-microvolt = <3400000>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  			};
>  
>  			BUCK5 {
>  				regulator-name = "BUCK5";
> -				regulator-min-microvolt = <1650000>;
> -				regulator-max-microvolt = <1950000>;
> +				regulator-min-microvolt = <600000>;
> +				regulator-max-microvolt = <3400000>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  			};
>  
>  			BUCK6 {
>  				regulator-name = "BUCK6";
> -				regulator-min-microvolt = <1045000>;
> -				regulator-max-microvolt = <1155000>;
> +				regulator-min-microvolt = <600000>;
> +				regulator-max-microvolt = <3400000>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  			};
>  
>  			LDO1 {
>  				regulator-name = "LDO1";
> -				regulator-min-microvolt = <1650000>;
> -				regulator-max-microvolt = <1950000>;
> +				regulator-min-microvolt = <1600000>;
> +				regulator-max-microvolt = <3300000>;
> +				regulator-boot-on;
> +				regulator-always-on;
> +			};
> +
> +			LDO2 {
> +				regulator-name = "LDO2";
> +				regulator-min-microvolt = <800000>;
> +				regulator-max-microvolt = <1150000>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  			};
>  
>  			LDO3 {
>  				regulator-name = "LDO3";
> -				regulator-min-microvolt = <1710000>;
> -				regulator-max-microvolt = <1890000>;
> +				regulator-min-microvolt = <800000>;
> +				regulator-max-microvolt = <3300000>;
> +				regulator-boot-on;
> +				regulator-always-on;
> +			};
> +
> +			ldo4: LDO4 {
> +				regulator-name = "LDO4";
> +				regulator-min-microvolt = <800000>;
> +				regulator-max-microvolt = <3300000>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  			};
> -- 
> 2.37.1
> 
> 
>