linux-kernel - Re: [PATCH 1/4] ARM: dts: exynos: Add missing used PMIC regulators on Exynos5422 Odroid boards

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Date:   Sun, 12 Aug 2018 15:25:53 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kukjin Kim <kgene@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [PATCH 1/4] ARM: dts: exynos: Add missing used PMIC regulators on
 Exynos5422 Odroid boards

On 11 August 2018 at 08:39, Anand Moon <linux.amoon@...il.com> wrote:
> Hi Krzysztof,
>
> These patches should also be ported to u-boot to enable PMIC.
>
> I was just looking into S2MPS11B data sheet
> According to the 1.2 Key Features of  S2MPS11
>
> BUCK1, BUCK2, BUCK3, BUCK4, BUCK6 have (0.65 V to 1.6 V) min /max range.
> BUCK5 have (0.65 V to 2.0 V) min /max range.
> BUCK7 have (1.2 V to 1.5 V) min / max range.
> BUCK8 have (1.8 V to 2.1 V) min / max range.
> BUCK10 have (0.75 V to 1.4 V) min / max range.
>
> BUCKBOST9 (3.0 V to 3.75 V) min / max range.
>
> LDO1, LDO6, LDO11, LDO22, LDO23, LDO27, LDO35 (0.8 V to 2.375 V) min / max range
>
> LDO2, LDO3, LDO5, LDO7, LDO9, LDO10, LD012, LDO13, LDO14, LDO15,
> LDO16, LDO17, LDO18, LDO19, LDO20, LD021, LDO24, LDO25, LDO26,
> LDO28, LDO29, LDO30, LDO31, LDO32, LDO33, LDO34, LDO36, LDO37, LDO38
> (0.8 V to 3.95 V) min / max range
>
> I am aware off we have configures the min/max range as per board schematics.
> but each regulator support dynamic voltage scale and have different
> turn on/off voltage and current rating.
>
> So why are we not setting the regulator-min-microvolt /
> regulator-max-microvolt as per datasheets.
> Please correct me if I am wrong.

Which regulators are not configured as in datasheet?

Best regards,
Krzysztof