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From: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: "Peter Chen"
	<hzpeterchen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	"Peter Chen" <peter.chen-3arQi8VN3Tc@public.gmane.org>,
	"Greg Kroah-Hartman"
	<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
	"Alan Stern"
	<stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>,
	"Ulf Hansson"
	<ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	"Sebastian Reichel" <sre-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	"Mark Rutland" <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"Krzysztof Kozłowski"
	<k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
	"Stephen Boyd"
	<stephen.boyd-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	oscar-Bdbr4918Nnnk1uMJSBkQmQ@public.gmane.org,
	"Arnd Bergmann" <arnd-r2nGTMty4D4@public.gmane.org>,
	"Pawel Moll" <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
	"linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"Sascha Hauer" <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
	"Linux USB List"
	<linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"Maciej S. Szmigiero"
	<mail-APzI5cXaD1zVlRWJc41N0YvC60bnQu0Y@public.gmane.org>,
	troy.kisky-Q5RJGjKts06CY9SHAMCTRUEOCMrvLtNR@public.gmane.org,
	"Javier Martinez Canillas"
	<javier-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>,
	"Philipp Zabel" <p.zabel@pengutron>
Subject: Re: [PATCH 08/12] doc: binding: pwrseq-usb-generic: add binding doc for generic usb power sequence driver
Date: Mon, 20 Jun 2016 18:06:10 +0100	[thread overview]
Message-ID: <20160620170609.GA26099@sirena.org.uk> (raw)
In-Reply-To: <20160620161607.GA11427@rob-hp-laptop>

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On Mon, Jun 20, 2016 at 11:16:07AM -0500, Rob Herring wrote:
> On Mon, Jun 20, 2016 at 07:26:51PM +0800, Peter Chen wrote:

> > If the node has property "power-sequence", the pwrseq core will create
> > related platform device, and the driver under pwrseq driver will handle
> > power sequence stuffs. 

> This I have issue with. If you are creating a platform device here, you 
> are trying to work-around limitations in the linux driver model. Either 
> we need some sort of pre-probe hook to the drivers to call or each 
> parent node driver is responsible for checking and calling pwr-seq 
> functions for child nodes. e.g. The host controller calls pwr-seq for 
> the hub, the hub driver calls the power seq for the asix chip. Soon as 
> we have a case too complex for the generic pwr-seq, we're going to need 
> the pre-probe hook as I don't want to see a continual expansion of 
> generic pwr-seq binding for ever more complex cases.

I think it's fairly clear that we need one or both of these mechanisms
for enumerable buses in embedded contexts - it's something that keeps
croping up.

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  reply	other threads:[~2016-06-20 17:06 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-17 10:09 [PATCH 00/12] power: add generic power sequence framework Peter Chen
2016-06-17 10:09 ` [PATCH 01/12] power/mmc: Move pwrseq drivers to power/pwrseq Peter Chen
2016-06-17 10:09 ` [PATCH 02/12] MAINTAINERS: Retain Ulf Hansson as the same maintainer of pwrseq Peter Chen
2016-06-17 10:09 ` [PATCH 03/12] power: pwrseq: Enable COMPILE_TEST for drivers Peter Chen
2016-06-17 10:09 ` [PATCH 05/12] power: pwrseq: Generalize mmc_pwrseq operations by removing mmc prefix Peter Chen
2016-06-17 10:09 ` [PATCH 06/12] power: pwrseq: change common helpers as generic Peter Chen
2016-06-17 10:09 ` [PATCH 07/12] power: pwrseq: rename file name for generic driver Peter Chen
2016-06-20 12:48   ` Krzysztof Kozlowski
2016-06-21  2:19     ` Peter Chen
2016-06-17 10:09 ` [PATCH 09/12] power: pwrseq: pwrseq_usb_generic: add generic power sequence support for USB deivces Peter Chen
2016-06-17 10:09 ` [PATCH 11/12] usb: chipidea: host: let the hcd know's parent device node Peter Chen
     [not found] ` <1466158165-9380-1-git-send-email-peter.chen-3arQi8VN3Tc@public.gmane.org>
2016-06-17 10:09   ` [PATCH 04/12] power: pwrseq: Remove mmc prefix from mmc_pwrseq Peter Chen
2016-06-17 10:09   ` [PATCH 08/12] doc: binding: pwrseq-usb-generic: add binding doc for generic usb power sequence driver Peter Chen
2016-06-17 17:16     ` Rob Herring
2016-06-20 11:26       ` Peter Chen
2016-06-20 12:29         ` Chen-Yu Tsai
2016-06-21  2:14           ` Peter Chen
2016-06-20 16:16         ` Rob Herring
2016-06-20 17:06           ` Mark Brown [this message]
2016-06-21  2:11           ` Peter Chen
2016-06-21 21:26             ` Rob Herring
2016-06-22  1:14               ` Peter Chen
2016-06-22  9:09               ` Ulf Hansson
2016-06-24 15:25                 ` Rob Herring
2016-06-17 10:09   ` [PATCH 10/12] usb: core: add power sequence handling for USB devices Peter Chen
     [not found]     ` <1466158165-9380-11-git-send-email-peter.chen-3arQi8VN3Tc@public.gmane.org>
2016-06-17 16:12       ` Alan Stern
2016-06-17 10:09   ` [PATCH 12/12] ARM: dts: imx6qdl-udoo.dtsi: fix onboard USB HUB property Peter Chen
2016-06-17 23:29 ` [PATCH 00/12] power: add generic power sequence framework Maciej S. Szmigiero
2016-06-20 11:27   ` Peter Chen

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