From: Chris Brandt <Chris.Brandt@renesas.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Simon Horman <horms@verge.net.au>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
Chunfeng Yun <chunfeng.yun@mediatek.com>,
USB list <linux-usb@vger.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>
Subject: RE: [PATCH v3 15/15] ARM: dts: rza2mevb: Add USB host support
Date: Wed, 15 May 2019 14:54:11 +0000 [thread overview]
Message-ID: <TYXPR01MB15684FF367D694BD5C203BB68A090@TYXPR01MB1568.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <CAMuHMdWLB-JE=2f=Mq9np_b5Wuj6=nB2ywWquBFheoBVxPaAfQ@mail.gmail.com>
Hi Geert,
On Wed, May 15, 2019 1, Geert Uytterhoeven wrote:
> > > Does resistor R78 need to be mounted, too?
> >
> > By default, R78 and R79 are not populated on these boards, and both Host
> > and Function work fine without board modification, so I would say
> > populating R78 is not a requirement as far as I can tell.
>
> I asked because after reading Section 2.4 USB Interface in the RZ/A2M CPU
> Board User's Manual, it's not clear to me when one needs to
> populate one of these resistors. Especially in relation to JP3, which
> talks about 2 possible modes (host vs. function), while the resistor
> paragraph talks about 3 possible modes (dual-role vs. host vs.
> function).
Honestly, I'm not sure what they were thinking.
They put on a USB-C connector, and put on circuitry to detect if a Host
or device was attached....but then put a physical jumper on the board to
connect/disconnect VBUS power.
> Perhaps I just need to drink more USB Kool-Aid?
> (no Kool-Aid sold in local shops, though; we live on Coke ;-)
Maybe not Kool-Aid as it seem they were 'smoking something' instead. :o
Chris
prev parent reply other threads:[~2019-05-15 14:54 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-14 14:55 [PATCH v3 00/15] usb: Add host and device support for RZ/A2 Chris Brandt
2019-05-14 14:55 ` [PATCH v3 01/15] ARM: dts: r7s9210: Add USB clock Chris Brandt
2019-05-15 7:38 ` Geert Uytterhoeven
2019-05-15 7:52 ` Simon Horman
2019-05-14 14:55 ` [PATCH v3 02/15] ARM: dts: rza2mevb: Add 48MHz " Chris Brandt
2019-05-15 7:43 ` Geert Uytterhoeven
2019-05-15 7:53 ` Simon Horman
2019-05-14 14:55 ` [PATCH v3 03/15] phy: renesas: rcar-gen3-usb2: detect usb_x1 clock Chris Brandt
2019-05-15 7:32 ` Yoshihiro Shimoda
2019-05-15 8:02 ` Simon Horman
2019-05-15 8:30 ` Kuninori Morimoto
2019-05-14 14:55 ` [PATCH v3 04/15] dt-bindings: rcar-gen3-phy-usb2: Document use of usb_x1 Chris Brandt
2019-05-14 19:29 ` Rob Herring
2019-05-15 7:33 ` Yoshihiro Shimoda
2019-05-15 7:35 ` Geert Uytterhoeven
2019-05-15 8:39 ` Sergei Shtylyov
2019-05-15 9:03 ` Geert Uytterhoeven
2019-05-15 7:57 ` Simon Horman
2019-05-14 14:55 ` [PATCH v3 05/15] phy: renesas: rcar-gen3-usb2: Check dr_mode when not using OTG Chris Brandt
2019-05-15 7:34 ` Yoshihiro Shimoda
2019-05-15 8:01 ` Simon Horman
2019-05-14 14:55 ` [PATCH v3 06/15] dt-bindings: rcar-gen3-phy-usb2: Document dr_mode Chris Brandt
2019-05-14 19:29 ` Rob Herring
2019-05-15 7:36 ` Yoshihiro Shimoda
2019-05-15 7:56 ` Simon Horman
2019-05-14 14:55 ` [PATCH v3 07/15] dt-bindings: rcar-gen3-phy-usb2: Add r7s9210 support Chris Brandt
2019-05-14 19:30 ` Rob Herring
2019-05-15 7:37 ` Yoshihiro Shimoda
2019-05-15 7:56 ` Simon Horman
2019-05-14 14:55 ` [PATCH v3 08/15] usb: renesas_usbhs: move flags to param Chris Brandt
2019-05-15 7:45 ` Yoshihiro Shimoda
2019-05-15 7:55 ` Simon Horman
2019-05-14 14:55 ` [PATCH v3 09/15] usb: renesas_usbhs: add support for CNEN bit Chris Brandt
2019-05-15 7:46 ` Yoshihiro Shimoda
2019-05-15 7:55 ` Simon Horman
2019-05-14 14:56 ` [PATCH v3 10/15] usb: renesas_usbhs: support byte addressable CFIFO Chris Brandt
2019-05-15 7:48 ` Yoshihiro Shimoda
2019-05-15 7:57 ` Yoshihiro Shimoda
2019-05-15 8:05 ` Simon Horman
2019-05-14 14:56 ` [PATCH v3 11/15] usb: renesas_usbhs: Add support for RZ/A2 Chris Brandt
2019-05-15 7:52 ` Yoshihiro Shimoda
2019-05-15 13:09 ` Chris Brandt
2019-05-15 8:06 ` Simon Horman
2019-05-15 8:26 ` Kuninori Morimoto
2019-05-15 14:18 ` Chris Brandt
2019-05-14 14:56 ` [PATCH v3 12/15] dt-bindings: usb: renesas_usbhs: Add support for r7s9210 Chris Brandt
2019-05-14 19:30 ` Rob Herring
2019-05-15 7:53 ` Yoshihiro Shimoda
2019-05-15 8:00 ` Geert Uytterhoeven
2019-05-15 13:11 ` Chris Brandt
2019-05-15 8:07 ` Simon Horman
2019-05-14 14:56 ` [PATCH v3 13/15] ARM: dts: r7s9210: Add USB Host support Chris Brandt
2019-05-15 7:59 ` Geert Uytterhoeven
2019-05-15 13:38 ` Chris Brandt
2019-05-15 9:05 ` Geert Uytterhoeven
2019-05-14 14:56 ` [PATCH v3 14/15] ARM: dts: r7s9210: Add USB Device support Chris Brandt
2019-05-15 8:02 ` Geert Uytterhoeven
2019-05-14 14:56 ` [PATCH v3 15/15] ARM: dts: rza2mevb: Add USB host support Chris Brandt
2019-05-15 8:21 ` Geert Uytterhoeven
2019-05-15 14:03 ` Chris Brandt
2019-05-15 14:33 ` Geert Uytterhoeven
2019-05-15 14:54 ` Chris Brandt [this message]
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