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

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Date:   Mon, 31 Jan 2022 14:55:21 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.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 1/31/22 14:23, 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:
> 
> ...
> 
>>>> +config TINYDRM_SSD130X
>>>> +	tristate "DRM support for Solomon SSD130X OLED displays"
>>>> +	depends on DRM && OF && I2C
>>>
>>> Please, make sure that it does NOT dependent on OF.
>>>
>>
>> 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.
>

Oh, I wasn't aware about PRP0001. I've read about it at:

https://www.kernel.org/doc/Documentation/acpi/enumeration.txt

> That said, please drop OF dependency.
>

Yes, got your point now and will drop the dep. Thanks for the explanation.

Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat