From: "Yann E. MORIN" <yann.morin.1998@free.fr>
To: Peter Seiderer <ps.report@gmx.net>
Cc: buildroot@buildroot.org, Martin Bark <martin@barkynet.com>,
Mahyar Koshkouei <mahyar.koshkouei@gmail.com>,
Arthur Courtel <arthur.courtel@smile.fr>
Subject: Re: [Buildroot] [PATCH v5 2/6] board/raspberrypicm4io: enable RTC and USB overlays
Date: Wed, 20 Oct 2021 21:47:46 +0200 [thread overview]
Message-ID: <20211020194746.GC2400@scaer> (raw)
In-Reply-To: <20211017225422.2e0348ce@gmx.net>
On 2021-10-17 22:54 +0200, Peter Seiderer spake thusly:
> On Sun, 17 Oct 2021 22:27:17 +0200, "Yann E. MORIN" <yann.morin.1998@free.fr> wrote:
> > On 2021-09-21 22:21 +0200, Peter Seiderer spake thusly:
> > > - add RTC and USB dtoverlay entries to config_cm4io.txt
> > Why specifically the RTC and USB? And why only on the CM, and not the
> > other boards?
> The config is not for the CM4 standalone, but specific to the
> CM4 IO Board, equipped (as the only RPi original one) with an
> RTC chip....
Ah, OK, that makes sense, then.
> > IIRC, dwc2 is an OTG chip, too, and it is also wired on the rpi0. Well,
> > by experience, I know that the rpi0 *can* do USB slave/OTG.
> And as far as I know the USB is enabled with all RPi's with
> exception of the CM4: 'The USB interface is disabled to save power by
> default on the CM4' (see [1] page 5)
>
> According to [2]:
>
> Name: dwc-otg
> Info: Selects the dwc_otg USB controller driver which has fiq support. This
> is the default on all except the Pi Zero which defaults to dwc2.
> Load: dtoverlay=dwc-otg
> Params: <None>
>
>
> Name: dwc2
> Info: Selects the dwc2 USB controller driver
> Load: dtoverlay=dwc2,<param>=<val>
> Params: dr_mode Dual role mode: "host", "peripheral" or "otg"
>
> g-rx-fifo-size Size of rx fifo size in gadget mode
>
> g-np-tx-fifo-size Size of non-periodic tx fifo size in gadget
> mode
> Would interpret 'defaults to dwc2' on Pi Zero as enabled by default...
Yes, it is enabled by default, as a host-only controller, not OTG, which
has to be explictly requested.
Regards,
Yann E. MORIN.
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next prev parent reply other threads:[~2021-10-20 19:48 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-21 20:21 [Buildroot] [PATCH v5 1/6] package/rpi-firmware: rework boot/config file handling Peter Seiderer
2021-09-21 20:21 ` [Buildroot] [PATCH v5 2/6] board/raspberrypicm4io: enable RTC and USB overlays Peter Seiderer
2021-10-17 20:27 ` Yann E. MORIN
2021-10-17 20:54 ` Peter Seiderer
2021-10-20 19:47 ` Yann E. MORIN [this message]
2022-01-13 22:13 ` Thomas Petazzoni
2021-09-21 20:21 ` [Buildroot] [PATCH v5 3/6] board/raspberrypicm4io-64: " Peter Seiderer
2022-01-13 22:13 ` Thomas Petazzoni
2021-09-21 20:21 ` [Buildroot] [PATCH v5 4/6] package/rpi-firmware: add option for the debug set of start/fixup boot files Peter Seiderer
2021-10-17 20:22 ` Yann E. MORIN
2021-09-21 20:21 ` [Buildroot] [PATCH v5 5/6] package/rpi-firmware: convert dtb overlay install loop to make-level foreach loop Peter Seiderer
2021-10-17 20:22 ` Yann E. MORIN
2021-09-21 20:21 ` [Buildroot] [PATCH v5 6/6] package/rpi-wifi-firmware: provide convenience links for RPi3A+, RPi3B+ and RPi4B firmware configuration files Peter Seiderer
2021-10-17 20:23 ` Yann E. MORIN
2021-10-17 20:21 ` [Buildroot] [PATCH v5 1/6] package/rpi-firmware: rework boot/config file handling Yann E. MORIN
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