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From: Rob Herring <robh@kernel.org>
To: Peter Chen <peter.chen@nxp.com>
Cc: Philippe Schenker <philippe.schenker@toradex.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
	Shawn Guo <shawnguo@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 1/3] dt-bindings: usb: ci-hdrc-usb2: add property disable-runtime-pm
Date: Fri, 17 Jul 2020 08:14:58 -0600	[thread overview]
Message-ID: <CAL_Jsq+A+Gj5Ry=eUakkD6bTVh73nmCt4=vyT62yjoh14QyU8w@mail.gmail.com> (raw)
In-Reply-To: <20200717023108.GA17070@b29397-desktop>

On Thu, Jul 16, 2020 at 8:31 PM Peter Chen <peter.chen@nxp.com> wrote:
>
> On 20-07-16 13:24:52, Rob Herring wrote:
> > On Tue, Jul 14, 2020 at 05:18:20PM +0200, Philippe Schenker wrote:
> > > Chipidea depends on some hardware signals to be there in order
> > > for runtime-pm to work well. Add the possibility to disable runtime
> > > power management that is necessary for certain boards.
> >
> > This is why we have SoC specific compatible strings. Use that.
>
> It is a board design limitation, not SoC's. To support USB low power
> mode for device mode, either VBUS connects to SoC, or VBUS connect to
> GPIO, or VBUS connect to Type-C IC, but none of the design is used
> at that board. So the USB can't enter low power mode for that board,
> otherwise, the USB controller can't be woken up since no any interrupts
> will occur if USB cable (host at other side) connects to the connector.

That's certainly a better explanation than the original.

Don't you need to describe the Vbus connection in the above cases?
Then you could handle this case based on the lack of a Vbus
description?

Rob

      reply	other threads:[~2020-07-17 14:15 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-14 15:18 [PATCH v2 1/3] dt-bindings: usb: ci-hdrc-usb2: add property disable-runtime-pm Philippe Schenker
2020-07-14 15:18 ` [PATCH v2 2/3] usb: chipidea: imx: support disabling runtime-pm Philippe Schenker
2020-07-14 15:18   ` Philippe Schenker
2020-07-15  0:51   ` Peter Chen
2020-07-15  0:51     ` Peter Chen
2020-07-15 10:23     ` Philippe Schenker
2020-07-15 10:23       ` Philippe Schenker
2020-07-20  3:44       ` Peter Chen
2020-07-20  3:44         ` Peter Chen
2020-07-20  7:51         ` Philippe Schenker
2020-07-20  7:51           ` Philippe Schenker
2020-07-20  8:06           ` Peter Chen
2020-07-20  8:06             ` Peter Chen
2020-07-20 10:10             ` Philippe Schenker
2020-07-20 10:10               ` Philippe Schenker
2023-05-04 16:23               ` Luca Ceresoli
2023-05-04 16:23                 ` Luca Ceresoli
2023-05-04 16:50                 ` Francesco Dolcini
2023-05-04 16:50                   ` Francesco Dolcini
2023-05-05  9:23                   ` Luca Ceresoli
2023-05-05  9:23                     ` Luca Ceresoli
2023-05-05 10:58                     ` Francesco Dolcini
2023-05-05 10:58                       ` Francesco Dolcini
2023-05-05  9:49                   ` Jun Li
2023-05-05  9:49                     ` Jun Li
2023-05-05 10:06                     ` Luca Ceresoli
2023-05-05 10:06                       ` Luca Ceresoli
2023-05-05 11:00                       ` Francesco Dolcini
2023-05-05 11:00                         ` Francesco Dolcini
2023-05-06  9:02                         ` Jun Li
2023-05-06  9:02                           ` Jun Li
2023-05-08 11:17                           ` Francesco Dolcini
2023-05-08 11:53                             ` Jun Li
2023-05-08 14:35                               ` Francesco Dolcini
2023-05-08 13:17                             ` Luca Ceresoli
2023-05-29 10:18                               ` Luca Ceresoli
2023-05-29 10:18                                 ` Luca Ceresoli
2023-05-30 11:22                                 ` Jun Li
2023-05-30 11:22                                   ` Jun Li
2023-07-06 10:23                                   ` Francesco Dolcini
2023-07-06 10:23                                     ` Francesco Dolcini
2023-07-17 16:45                                     ` Luca Ceresoli
2023-07-17 16:45                                       ` Luca Ceresoli
2023-07-18  8:14                                       ` Francesco Dolcini
2023-07-18  8:14                                         ` Francesco Dolcini
2023-07-18  8:31                                       ` [EXT] " Xu Yang
2023-07-18  8:31                                         ` Xu Yang
2023-07-18 12:25                                         ` Luca Ceresoli
2023-07-18 12:25                                           ` Luca Ceresoli
2023-07-19 11:23                                           ` Xu Yang
2023-07-19 11:23                                             ` Xu Yang
2023-07-19 16:48                                             ` Luca Ceresoli
2023-07-19 16:48                                               ` Luca Ceresoli
2023-07-20 10:13                                               ` Xu Yang
2023-07-20 10:13                                                 ` Xu Yang
2023-07-20 12:49                                                 ` Luca Ceresoli
2023-07-20 12:49                                                   ` Luca Ceresoli
2023-07-21  2:06                                                   ` Xu Yang
2023-07-21  2:06                                                     ` Xu Yang
     [not found]                                                     ` <20230721232750.0aea6e0f@booty>
     [not found]                                                       ` <DB7PR04MB450517AD9F25F47320835A5B8C03A@DB7PR04MB4505.eurprd04.prod.outlook.com>
2023-09-29 13:37                                                         ` Luca Ceresoli
2023-10-10 10:52                                                           ` Xu Yang
2023-10-10 10:52                                                             ` Xu Yang
2020-07-14 15:18 ` [PATCH v2 3/3] ARM: dts: colibri-imx6ull: disable runtime pm Philippe Schenker
2020-07-14 15:18   ` Philippe Schenker
2020-07-16 19:24 ` [PATCH v2 1/3] dt-bindings: usb: ci-hdrc-usb2: add property disable-runtime-pm Rob Herring
2020-07-17  2:31   ` Peter Chen
2020-07-17 14:14     ` Rob Herring [this message]

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