linux-kernel - Re: [PATCH 5/5] platform: Make platform

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Message-ID: <1406913674.22529.45.camel@hornet>
Date:	Fri, 01 Aug 2014 18:21:14 +0100
From:	Pawel Moll <pawel.moll@....com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"paul@...an.com" <paul@...an.com>, Arnd Bergmann <arnd@...db.de>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"arm@...nel.org" <arm@...nel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] platform: Make platform_bus device a platform device

On Sat, 2014-07-26 at 21:12 +0100, Greg Kroah-Hartman wrote:
> On Fri, Jul 25, 2014 at 03:23:53PM +0100, Pawel Moll wrote:
> > ... describing the root of the device tree, so one can write
> > a platform driver initializing the platform.
> 
> Wait, what do you mean by "one can write a platform driver initializing
> the platform"?  I don't understand your end goal here...

Bad wording, sorry. The goal is to have a platform driver (as in
platform bus) that will initialize my platform (as in: board, machine,
hardware). My platform (as in: the board) will be represented by the
root platform bus device (as in: the bus ;-) with compatible value
matching the one passed in the device tree's root.

The tree:

8<----------------------------
/ {
	compatible = "my,board";
}
8<----------------------------

The driver:

8<----------------------------
static struct of_device_id my_board_match[] = {
        { .compatible = "my,board", },
        {},
};

static struct platform_driver my_board_driver = {
        .driver = {
                .name = "my_board",
                .owner = THIS_MODULE,
                .of_match_table = of_match_ptr(my_board_match),
        },
        .probe = my_board_probe,
        .remove = my_board_remove,
};
module_platform_driver(my_board_driver);
8<----------------------------

I'll work on better commit message for the next spin.

Paweł


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