linux-kernel - Re: [PATCHv3 3/6] arm64: dts: amlogic: odroidc2: Fix the chip enable signal for usb power

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Date:   Sat, 28 Aug 2021 18:00:28 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Matt Corallo <oc2udbzfd@...tcorallo.com>,
        Rob Herring <robh+dt@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Emiliano Ingrassia <ingrassia@...genesys.com>,
        Brian Kim <brian.kim@...dkernel.com>
Subject: Re: [PATCHv3 3/6] arm64: dts: amlogic: odroidc2: Fix the chip enable
 signal for usb power

Hi Anand,

On Tue, Aug 17, 2021 at 6:17 AM Anand Moon <linux.amoon@...il.com> wrote:
>
> Fix the chip enable signal changing from Active High to Active Low
> to enable input power to USB power. Also updated signal name as per
> the schematics.
according to [0] (page 12) Odroid-C2 uses an "RT9715EGB" for USB OTG power
The datasheet for that power switch [1] mentions on page page 1 that
the "E" stands for "E : 1.1A/Active High"

Can you please elaborate how you have tested this to confirm that
active low is the correct polarity?


Best regards,
Martin


[0] https://dn.odroid.com/S905/Schematic/odroid-c2_rev0.1_20150930.pdf
[1] https://www.richtek.com/assets/product_file/RT9715/DS9715-03.pdf