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 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
WARNING: multiple messages have this Message-ID (diff)
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
next prev parent reply other threads:[~2019-05-15 14:54 UTC|newest] Thread overview: 114+ 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 ` Chris Brandt 2019-05-14 14:55 ` [PATCH v3 01/15] ARM: dts: r7s9210: Add USB clock Chris Brandt 2019-05-14 14:55 ` Chris Brandt 2019-05-15 7:38 ` Geert Uytterhoeven 2019-05-15 7:38 ` Geert Uytterhoeven 2019-05-15 7:52 ` Simon Horman 2019-05-15 7:52 ` Simon Horman 2019-05-14 14:55 ` [PATCH v3 02/15] ARM: dts: rza2mevb: Add 48MHz " Chris Brandt 2019-05-14 14:55 ` Chris Brandt 2019-05-15 7:43 ` Geert Uytterhoeven 2019-05-15 7:43 ` Geert Uytterhoeven 2019-05-15 7:53 ` Simon Horman 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 2019-05-14 14:55 ` Chris Brandt 2019-05-15 7:32 ` Yoshihiro Shimoda 2019-05-15 7:32 ` Yoshihiro Shimoda 2019-05-15 8:02 ` Simon Horman 2019-05-15 8:30 ` Kuninori Morimoto 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 14:55 ` Chris Brandt 2019-05-14 19:29 ` Rob Herring 2019-05-14 19:29 ` Rob Herring 2019-05-15 7:33 ` Yoshihiro Shimoda 2019-05-15 7:33 ` Yoshihiro Shimoda 2019-05-15 7:35 ` Geert Uytterhoeven 2019-05-15 7:35 ` Geert Uytterhoeven 2019-05-15 8:39 ` Sergei Shtylyov 2019-05-15 8:39 ` Sergei Shtylyov 2019-05-15 9:03 ` Geert Uytterhoeven 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 2019-05-14 14:55 ` Chris Brandt 2019-05-15 7:34 ` Yoshihiro Shimoda 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 14:55 ` Chris Brandt 2019-05-14 19:29 ` Rob Herring 2019-05-14 19:29 ` Rob Herring 2019-05-15 7:36 ` Yoshihiro Shimoda 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 14:55 ` Chris Brandt 2019-05-14 19:30 ` Rob Herring 2019-05-14 19:30 ` Rob Herring 2019-05-15 7:37 ` Yoshihiro Shimoda 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 2019-05-14 14:55 ` Chris Brandt 2019-05-15 7:45 ` Yoshihiro Shimoda 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 2019-05-14 14:55 ` Chris Brandt 2019-05-15 7:46 ` Yoshihiro Shimoda 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 2019-05-14 14:56 ` Chris Brandt 2019-05-15 7:48 ` Yoshihiro Shimoda 2019-05-15 7:48 ` Yoshihiro Shimoda 2019-05-15 7:57 ` 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 2019-05-14 14:56 ` Chris Brandt 2019-05-15 7:52 ` Yoshihiro Shimoda 2019-05-15 7:52 ` Yoshihiro Shimoda 2019-05-15 13:09 ` Chris Brandt 2019-05-15 13:09 ` Chris Brandt 2019-05-15 8:06 ` Simon Horman 2019-05-15 8:26 ` Kuninori Morimoto 2019-05-15 8:26 ` Kuninori Morimoto 2019-05-15 14:18 ` Chris Brandt 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 14:56 ` Chris Brandt 2019-05-14 19:30 ` Rob Herring 2019-05-14 19:30 ` Rob Herring 2019-05-15 7:53 ` Yoshihiro Shimoda 2019-05-15 7:53 ` Yoshihiro Shimoda 2019-05-15 8:00 ` Geert Uytterhoeven 2019-05-15 8:00 ` Geert Uytterhoeven 2019-05-15 13:11 ` Chris Brandt 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 2019-05-14 14:56 ` Chris Brandt 2019-05-15 7:59 ` Geert Uytterhoeven 2019-05-15 7:59 ` Geert Uytterhoeven 2019-05-15 13:38 ` Chris Brandt 2019-05-15 13:38 ` Chris Brandt 2019-05-15 9:05 ` Geert Uytterhoeven 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 2019-05-14 14:56 ` Chris Brandt 2019-05-15 8:02 ` Geert Uytterhoeven 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 2019-05-14 14:56 ` Chris Brandt 2019-05-15 8:21 ` Geert Uytterhoeven 2019-05-15 8:21 ` Geert Uytterhoeven 2019-05-15 14:03 ` Chris Brandt 2019-05-15 14:03 ` Chris Brandt 2019-05-15 14:33 ` Geert Uytterhoeven 2019-05-15 14:33 ` Geert Uytterhoeven 2019-05-15 14:54 ` Chris Brandt [this message] 2019-05-15 14:54 ` Chris Brandt
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