linux-kernel - Re: [PATCH] staging: fbtft: ili9341: use macro FBTFT_REGISTER_SPI

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Date:   Mon, 3 Jul 2023 15:25:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Raphaël Gallais-Pou <rgallaispou@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: fbtft: ili9341: use macro
 FBTFT_REGISTER_SPI_DRIVER

On Sun, Jul 02, 2023 at 03:05:25PM +0200, Raphaël Gallais-Pou wrote:
> Hi,
> 
> Le 02/07/2023 à 14:02, Greg Kroah-Hartman a écrit :
> > On Sun, Jul 02, 2023 at 10:03:24AM +0200, Raphael Gallais-Pou wrote:
> > > Using FBTFT_REGISTER_DRIVER resolves to a NULL struct spi_device_id. This
> > > ultimately causes the module to an early exit at probe time.
> > 
> > So this doesn't work at all today?  Has it ever worked?  What commit
> > does thi fix?
> 
> I tested again with only a tweak in my device-tree. The early exit in the
> driver's code is caused by a missing field. So regarding this particular
> driver the macro works.
> 
> It resolves to set spi_driver.id_table = NULL, which yields a warning in
> __spi_register_driver(). So I guess this patch only fixes a warning.

Ok, please fix the changelog text when you resend this.

> > > In addition the MODULE_ALIASes can be dropped.
> > 
> > Why?  When you say "also" or "in addition", that's a huge hint it should
> > be a separate patch.
> I did not find any reference to those aliases in the kernel, which led me to
> remove those.

Aliases are used by userspace, not the kernel.

> If you think they are still necessary, I'll split them in an upcoming v2.

Please document why they are not needed in order to be able to be
removed.

thanks,

greg k-h