linux-kernel - Re: [PATCH v1 1/4] fbtft: Unorphan the driver

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Date:   Mon, 31 Jan 2022 15:24:41 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Andy Shevchenko <andy@...nel.org>, linux-fbdev@...r.kernel.org,
        Michael Hennerich <michael.hennerich@...log.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Helge Deller <deller@....de>, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Phillip Potter <phil@...lpotter.co.uk>,
        Carlis <zhangxuezhi1@...ong.com>,
        Lee Jones <lee.jones@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH v1 1/4] fbtft: Unorphan the driver

On Mon, Jan 31, 2022 at 03:23:13PM +0200, Andy Shevchenko wrote:
> On Mon, Jan 31, 2022 at 01:08:32PM +0100, Javier Martinez Canillas wrote:
> > On 1/31/22 12:36, Andy Shevchenko wrote:

...

> > I actually added this dependency deliberative. It's true that the driver is using
> > the device properties API and so there isn't anything from the properties parsing
> > point of view that depends on OF. And the original driver didn't depend on OF.
> > 
> > But the original driver also only would had worked with Device Trees since the
> > of_device_id table is the only one that contains the device specific data info.
> > 
> > The i2c_device_id table only listed the devices supported to match, but then it
> > would only had worked with the default values that are set by the driver.
> > 
> > So in practice it *does* depend on OF. I'll be happy to drop that dependency if
> > you provide an acpi_device_id table to match.
> 
> The code is deceptive and you become to a wrong conclusion. No, the driver
> does NOT depend on OF as a matter of fact. The tricky part is the PRP0001
> ACPI PNP ID that allows to reuse it on ACPI-based platforms.
> 
> That said, please drop OF dependency.

Side note: 72915994e028 ("video: ssd1307fb: Make use of device properties")

-- 
With Best Regards,
Andy Shevchenko