linux-kernel - Re: [PATCH] arm: dts: IPQ4019: add SDHCI VQMMC LDO node

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Message-ID: <CA+HBbNHiya-4bbOr_iMbJXNaZ-e-+GfsJm3S7H8Y+ZD_=f7gyQ@mail.gmail.com>
Date:   Tue, 26 Jan 2021 10:45:28 +0100
From:   Robert Marko <robert.marko@...tura.hr>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <agross@...nel.org>, robh+dt@...nel.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luka Perkov <luka.perkov@...tura.hr>
Subject: Re: [PATCH] arm: dts: IPQ4019: add SDHCI VQMMC LDO node

On Mon, Jan 25, 2021 at 5:50 PM Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Mon 07 Sep 05:19 CDT 2020, Robert Marko wrote:
>
> > Since we now have driver for the SDHCI VQMMC LDO needed
> > for I/0 voltage levels lets introduce the necessary node for it.
> >
> > Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> > Cc: Luka Perkov <luka.perkov@...tura.hr>
> > ---
> >  arch/arm/boot/dts/qcom-ipq4019.dtsi | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/qcom-ipq4019.dtsi b/arch/arm/boot/dts/qcom-ipq4019.dtsi
> > index 6741a1972e55..7774dbd3cec7 100644
> > --- a/arch/arm/boot/dts/qcom-ipq4019.dtsi
> > +++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi
> > @@ -211,6 +211,16 @@ tlmm: pinctrl@...0000 {
> >                       interrupts = <GIC_SPI 208 IRQ_TYPE_LEVEL_HIGH>;
> >               };
> >
> > +             vqmmc: regulator@...8000 {
> > +                     compatible = "qcom,vqmmc-ipq4019-regulator";
> > +                     reg = <0x01948000 0x4>;
>
> The actual hardware block where this register is found is the "TCSR"
> which is 0x01947000 of size 0x21000 - making this the register at offset
> 0x11000.
>
> Perhaps it would have been better represented as a simple-mfd with this
> regulator as a child node thereof.
>
>
> That said, this has been sitting long enough, so I'll merge it as is and
> we can rework it once we need more pieces of tcsr.

Thanks,
I was unaware that it is part of TCSR as I don't have datasheets
and this was ported from multiple versions of the downstream driver.

Regards,
Robert
>
> Thanks,
> Bjorn
>
> > +                     regulator-name = "vqmmc";
> > +                     regulator-min-microvolt = <1500000>;
> > +                     regulator-max-microvolt = <3000000>;
> > +                     regulator-always-on;
> > +                     status = "disabled";
> > +             };
> > +
> >               sdhci: sdhci@...4900 {
> >                       compatible = "qcom,sdhci-msm-v4";
> >                       reg = <0x7824900 0x11c>, <0x7824000 0x800>;
> > --
> > 2.26.2
> >