linux-kernel - Re: [BUG] SPI broken for SPI based panel drivers

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Message-Id: <6283C16F-549C-4463-BC08-E2C1A1D78B2F@goldelico.com>
Date:   Tue, 1 Dec 2020 15:35:58 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Sven Van Asbroeck <thesven73@...il.com>,
        kernel list <linux-kernel@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: [BUG] SPI broken for SPI based panel drivers

Hi Linus,

> Am 01.12.2020 um 15:20 schrieb Linus Walleij <linus.walleij@...aro.org>:
> 
> Hi Nikolaus, Sven,
> 
> the fault that the thing broke in the first place is all mine.
> Credit where credit is due!
> 
> The reason why I shoot in the dark to convert all SPI
> drivers to use GPIO descriptors instead of the global
> GPIO numberspace is detailed in drivers/gpio/TODO
> so I will not repeat it here.
> 
> I don't know if much can be done about it other than
> having better programmers than me at the task. Or
> less tired when they write the patch. etc.
> 
> What other operating systems do to get around the same
> type of refactoring problem is to aggressively
> deprecate and delete code that does not follow the
> latest ideas of the driver subsystem developer. This
> is not an option on Linux because we don't like to leave
> working hardware and users behind so I am painstakingly
> fixing it all over the place, with a little help from my
> friends. Sometimes it blows up in my face, sometimes
> in other people faces too, sorry about that.

Everyone has such a patch written at the wrong time of the day...
See for example: f069b5a0b27a

Let's work on a fix for the fix now.

BR and thanks,
Nikolaus