linux-kernel - Re: [PATCHv1 1/3] arm64: dts: meson: odroid-c2: Add missing regulator linked to P5V0 regulator

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Date:   Sun, 1 Sep 2019 23:53:41 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic@...ts.infradead.org,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv1 1/3] arm64: dts: meson: odroid-c2: Add missing regulator
 linked to P5V0 regulator

Hi Anand,

On Sun, Sep 1, 2019 at 3:58 PM Anand Moon <linux.amoon@...il.com> wrote:
>
> Hi Martin,
>
> Thanks for your review comments.
>
> Their have been some revision changes in S905 Odroid Schematics.
> [0] https://dn.odroid.com/S905/Schematic/
>
> Well I have make my changes based on old odroid-c2_rev0.2_20151218.pdf

[...]
> >
> > according to the schematics there's both:
> > - VDDIO_AO3V3
> > - VCC3V3 (which is turned on by VDDIO_AO3V3, see [0])
> >
>
> From the schematics it seams same.
>
> VDDIO_AO3V3---DMG340LSQN4 (Q4)---VCC3V3
yes, they are the same signal. the only difference is that VCC3V3 is
turned on later in the power-up sequence

> But this name change was done to link TFLASH_VDD_EN to TFLASH_VDD for eMMC
>
> VDDIO_AO3V3-----TFLASH_VDD using  TFLASH_VDD_EN gpio pin.
>
> Well I have tested this changes on eMMC module.
I cannot see any of the TFLASH_* regulators being linked to eMMC (they
are only linked to the SD card slot, I also checked
odroid-c2_rev0.2_20151218.pdf and odroid-c2_rev0.2_20171114.pdf).
which page of the odroid-c2_rev0.2_20151218.pdf schematics shows how
TFLASH_VDD is linked to eMMC?

please note that I don't have an Odroid-C2 board myself (so I cannot
test any of this).


Martin