linux-kernel - Re: [PATCHv4 5/8] drm: tegra: Remove redundant host1x

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Message-ID: <50D938AC.50001@wwwdotorg.org>
Date:	Mon, 24 Dec 2012 22:25:00 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Terje Bergström <tbergstrom@...dia.com>
CC:	Thierry Reding <thierry.reding@...onic-design.de>,
	"airlied@...ux.ie" <airlied@...ux.ie>,
	"dev@...xeye.de" <dev@...xeye.de>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arto Merilainen <amerilainen@...dia.com>
Subject: Re: [PATCHv4 5/8] drm: tegra: Remove redundant host1x

On 12/21/2012 11:50 PM, Terje Bergström wrote:
> On 21.12.2012 16:36, Thierry Reding wrote:
>> On Fri, Dec 21, 2012 at 01:39:21PM +0200, Terje Bergstrom wrote:
>>> +static struct platform_driver tegra_drm_platform_driver = {
>>> +	.driver = {
>>> +		.name = "tegradrm",
>>
>> This should be "tegra-drm" to match the module name.
> 
> We've actually created two problems.
> 
> First is that the device name should match driver name which should
> match module name. But host1x doesn't know the module name of tegradrm.

There's no hard requirement for the device/driver name to match the
module name. It's good thing to do, but nothing will blow up if it don't
(modules can use MODULE_ALIAS() to declare which drivers they expose).

But, what's the problem with host1x knowing the driver name; the host1x
driver and tegradrm driver are both part of the same code-base, so this
seems trivial to achieve.

> Second problem is that host1x driver creates tegradrm device even if
> tegradrm isn't loaded to system.

That's fine. If there's no driver, the device simply won't be probe()d.
That's just like a device node existing in device tree, but the driver
for it not being enabled in the kernel, or the relevant module not being
inserted.

> These mean that the device has to be created in tegra-drm module to have

I definitely disagree here.
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