linux-kernel - Re: [PATCH 09/11] ARM: dts: qcom: pm8941: add 5vs2 regulator node

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Date:   Thu, 15 Aug 2019 18:44:17 -0400
From:   Brian Masney <masneyb@...tation.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        freedreno <freedreno@...ts.freedesktop.org>
Subject: Re: [PATCH 09/11] ARM: dts: qcom: pm8941: add 5vs2 regulator node

On Thu, Aug 15, 2019 at 10:34:17AM +0200, Linus Walleij wrote:
> On Thu, Aug 15, 2019 at 2:49 AM Brian Masney <masneyb@...tation.org> wrote:
> 
> > pm8941 is missing the 5vs2 regulator node so let's add it since its
> > needed to get the external display working. This regulator was already
> > configured in the interrupts property on the parent node.
> >
> > Note that this regulator is referred to as mvs2 in the downstream MSM
> > kernel sources.
> 
> When I looked at it it seemed like this convention is used for power
> supplies that appear on both the main PMIC and the "extra (boot? basic?
> low power?) PMIC that the main 80xx PMIC has mvs1 and the
> other 89xx PMIC has mvs2.

According to the downstream MSM sources, the 5vs1 and 5vs2 rails are
both on the second pm8941 PMIC:

https://github.com/AICP/kernel_lge_hammerhead/blob/n7.1/arch/arm/boot/dts/msm8974-regulator.dtsi#L18

> I suppose it is named "mvs" on both PMICs and this is just a rail
> name so as not to confuse the schematic?

That sounds reasonable.

> > Signed-off-by: Brian Masney <masneyb@...tation.org>
> 
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Thank you!

Brian