linux-kernel - Re: [PATCH 03/16] arm64: dts: imx8mm-beacon-som.dtsi: Align regulator names with schema

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Message-ID: <fa042a4f670775f340e88fca8f363252112fd538.camel@fi.rohmeurope.com>
Date:   Tue, 25 Aug 2020 06:51:33 +0000
From:   "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
To:     "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "linux-imx@....com" <linux-imx@....com>,
        "han.xu@....com" <han.xu@....com>,
        "Anson.Huang@....com" <Anson.Huang@....com>,
        "yibin.gong@....com" <yibin.gong@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "aford173@...il.com" <aford173@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "richard@....at" <richard@....at>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "krzk@...nel.org" <krzk@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "daniel.baluta@....com" <daniel.baluta@....com>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
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        "jun.li@....com" <jun.li@....com>
Subject: Re: [PATCH 03/16] arm64: dts: imx8mm-beacon-som.dtsi: Align regulator
 names with schema

Hello Krzysztof,

Just some questions - please ignore if I misunderstood the impact of
the change.

On Mon, 2020-08-24 at 21:06 +0200, Krzysztof Kozlowski wrote:
> Device tree schema expects regulator names to be lowercase.  This
> fixes
> dtbs_check warnings like:
> 
>     arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dt.yaml: pmic@4b:
> regulators:LDO1:regulator-name:0: 'LDO1' does not match '^ldo[1-6]$'
> 
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  .../boot/dts/freescale/imx8mn-ddr4-evk.dts    | 22 +++++++++------
> ----
>  1 file changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
> b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
> index a1e5483dbbbe..299caed5d46e 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
> @@ -60,7 +60,7 @@
>  
>  		regulators {
>  			buck1_reg: BUCK1 {
> -				regulator-name = "BUCK1";
> +				regulator-name = "buck1";

I am not against this change but I would expect seeing some other
patches too? I guess this will change the regulator name in regulator
core, right? So maybe I am mistaken but it looks to me this change is
visible in suppliers, sysfs and debugfs too? Thus changing this sounds
a bit like asking for a nose bleed :) Am I right that the impact of
this change has been thoroughly tested? Are there any other patches
(that I have not seen) related to this change?

>  				regulator-min-microvolt = <700000>;
>  				regulator-max-microvolt = <1300000>;
>  				regulator-boot-on;
> @@ -69,7 +69,7 @@
>  			};
>  
>  			buck2_reg: BUCK2 {
> -				regulator-name = "BUCK2";
> +				regulator-name = "buck2";
>  				regulator-min-microvolt = <700000>;
>  				regulator-max-microvolt = <1300000>;
>  				regulator-boot-on;
> @@ -79,14 +79,14 @@
>  
>  			buck3_reg: BUCK3 {
>  				// BUCK5 in datasheet
> -				regulator-name = "BUCK3";
> +				regulator-name = "buck3";
>  				regulator-min-microvolt = <700000>;
>  				regulator-max-microvolt = <1350000>;
>  			};
>  
>  			buck4_reg: BUCK4 {
>  				// BUCK6 in datasheet
> -				regulator-name = "BUCK4";
> +				regulator-name = "buck4";
>  				regulator-min-microvolt = <3000000>;
>  				regulator-max-microvolt = <3300000>;
>  				regulator-boot-on;
> @@ -95,7 +95,7 @@
>  
>  			buck5_reg: BUCK5 {
>  				// BUCK7 in datasheet
> -				regulator-name = "BUCK5";
> +				regulator-name = "buck5";

What I see in bd718x7-regulator.c for LDO6 desc is:

                        /* LDO6 is supplied by buck5 */
                        .supply_name = "buck5",

So, is this change going to change the supply-chain for the board? Is
this intended? (Or am I mistaken on what is the impact of regulator-
name property?)

Best Regards
	Matti Vaittinen