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From: Martin Blumenstingl <>
To: Anand Moon <>
	Matt Corallo <>,
	Rob Herring <>,
	Neil Armstrong <>,
	Kevin Hilman <>,
	Jerome Brunet <>,
	Kishon Vijay Abraham I <>,
	Vinod Koul <>,
	Emiliano Ingrassia <>,
	Brian Kim <>,
Subject: Re: [PATCHv2 1/4] ARM: dts: meson8b: odroidc1: Add usb phy power node
Date: Sat, 17 Jul 2021 21:46:04 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Hi Anand,

On Fri, Jul 16, 2021 at 12:37 PM Anand Moon <> wrote:
> Add missing usb phy power node for phy mode fix below warning.
> P5V0 regulator suppy input voltage range to USB host controller.
low prio - typo: suppy -> supply

> As descriped in the C1+ schematics, GPIO GPIOAO_5 is used to
low prio - typo: descriped -> described

> enable input power to USB ports, set it to Active Low.
> [    1.253149] phy phy-c1108820.phy.0: Looking up phy-supply from device tree
> [    1.253166] phy phy-c1108820.phy.0: Looking up phy-supply property
>                 in node /soc/cbus@c1100000/phy@8820 failed
high prio:
Can you please describe how I can test this patch?
My concern is that previously I have tested your patch with ACTIVE_LOW
and ACTIVE_HIGH polarity.
In both cases USB is working and I cannot observe any change (apart
from this debug message being gone).

In the Odroid-C1 schematics (page 1) GPIOAO.BIT5 is connected to USB_OTG *only*.
I cannot give my Acked-/Reviewed-/Tested-by without a description of
how I can actually test the GPIO potion of this patch.

> +               /*
> +                * signal name from schematics: PWREN - GPIOAO.BIT5
> +                */
> +               gpios = <&gpio_ao GPIOAO_5 GPIO_ACTIVE_HIGH>;
low prio:
Even though it's strictly not necessary I think this is confusing to read.
Since there's no "enable-active-high" property the GPIO will be
considered as "active low".
My suggestion is to change GPIO_ACTIVE_HIGH to GPIO_ACTIVE_LOW

Also if you have any extra information since you last pinged me on IRC
then it would be great if you could document it.
I am referring to these IRC message, where you are stating that the
correct polarity should be "active high":
<armoon> xdarklight I have a question on USB GPIO Polarity on Odroid C1+
<armoon> As per the
<armoon> MP62551DGT-LF IC controls the power for the USB PORTS
<armoon> is
MP62551DGT datasheet
<armoon> As per the data sheet in section ORDERING INFORMATION  Active
enable signal is set below MP62551DGT Active High

>  &usb1_phy {
>         status = "okay";
> +       phy-supply = <&usb_pwr_en>;
medium priority:
I have raised the following concern in one of my previous emails on this topic:
> The mistake I made before is considering USB VBUS as PHY power supply.
> I believe the USB PHY is actually powered by the AVDD18_USB_ADC and
> USB33_VDDIOH signals. See the S905 datasheet [0], page 25
> These are 1.8V and 3.3V signals while you are adding a 5V regulator.
you replied with:
> OK, thanks.
so I don't understand what "OK, thanks" means.
If it means "Martin, you are wrong" then please provide a description
so I can also learn something!

Best regards,

  reply	other threads:[~2021-07-17 19:46 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-16 10:36 [PATCHv2 0/4] Meson-8b and Meson-gxbb Fix some missing code Anand Moon
2021-07-16 10:36 ` [PATCHv2 1/4] ARM: dts: meson8b: odroidc1: Add usb phy power node Anand Moon
2021-07-17 19:46   ` Martin Blumenstingl [this message]
2021-07-18  3:38     ` Anand Moon
2021-07-18 11:37       ` Martin Blumenstingl
2021-07-18 13:29         ` Anand Moon
2021-07-18 14:01           ` Martin Blumenstingl
2021-07-18 19:09             ` Martin Blumenstingl
2021-08-04 21:58               ` Martin Blumenstingl
2021-08-05 18:18                 ` Anand Moon
2021-08-13 19:35                   ` Anand Moon
2021-07-16 10:36 ` [PATCHv2 2/4] arm64: dts: amlogic: odroidc2: Fix the chip enable signal for usb power Anand Moon
2021-07-17 19:59   ` Martin Blumenstingl
2021-07-16 10:36 ` [PATCHv2 3/4] phy: amlogic: meson8b-usb2: Power off the PHY by putting it into reset mode Anand Moon
2021-07-16 10:36 ` [PATCHv2 4/4] phy: amlogic: meson8b-usb2: don't log an error on -EPROBE_DEFER Anand Moon

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