linux-kernel - Re: [PATCH v3 1/4] staging: fbtft: Rectify GPIO handling

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Message-ID: <YJAm6D2LUtVz1YNa@kroah.com>
Date:   Mon, 3 May 2021 18:38:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Phil Reid <preid@...ctromag.com.au>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Jan Sebastian Götte <linux@...eg.net>,
        Nishad Kamdar <nishadkamdar@...il.com>
Subject: Re: [PATCH v3 1/4] staging: fbtft: Rectify GPIO handling

On Wed, Apr 28, 2021 at 04:04:12PM +0300, Andy Shevchenko wrote:
> The infamous commit c440eee1a7a1 ("Staging: staging: fbtft: Switch to
> the GPIO descriptor interface") broke GPIO handling completely.
> It has already four commits to rectify and it seems not enough.
> In order to fix the mess here we:
> 
>   1) Set default to "inactive" for all requested pins
> 
>   2) Fix CS#, RD#, and WR# pins polarity since it's active low
>      and GPIO descriptor interface takes it into consideration
>      from the Device Tree or ACPI
> 
>   3) Consolidate chip activation (CS# assertion) under default
>      ->reset() callback
> 
> To summarize the expectations about polarity for GPIOs:
> 
>    RD#			Low
>    WR#			Low
>    CS#			Low
>    RESET#		Low
>    DC or RS		High
>    RW			High
>    Data	0 .. 15		High
> 
> See also Adafruit learning course [1] for the example of the schematics.
> 
> While at it, drop unneeded NULL checks, since GPIO API is tolerant to that.
> 
> [1]: https://learn.adafruit.com/adafruit-2-8-and-3-2-color-tft-touchscreen-breakout-v2/downloads
> 
> Fixes: 92e3e884887c ("Staging: staging: fbtft: Fix GPIO handling")
> Fixes: b918d1c27066 ("Staging: staging: fbtft: Fix reset assertion when using gpio descriptor")
> Fixes: dbc4f989c878 ("Staging: staging: fbtft: Fix probing of gpio descriptor")
> Fixes: c440eee1a7a1 ("Staging: staging: fbtft: Switch to the gpio descriptor interface")

I get the following error when trying to apply this:

	Fixes tag: Fixes: 92e3e884887c ("Staging: staging: fbtft: Fix GPIO handling")
	Has these problem(s):
	        - Subject does not match target commit subject
	          Just use
		                git log -1 --format='Fixes: %h ("%s")'
	Fixes tag: Fixes: b918d1c27066 ("Staging: staging: fbtft: Fix reset assertion when using gpio descriptor")
	Has these problem(s):
	        - Subject does not match target commit subject
	          Just use
		                git log -1 --format='Fixes: %h ("%s")'
	Fixes tag: Fixes: dbc4f989c878 ("Staging: staging: fbtft: Fix probing of gpio descriptor")
	Has these problem(s):
	        - Subject does not match target commit subject
	          Just use
		                git log -1 --format='Fixes: %h ("%s")'
	Fixes tag: Fixes: c440eee1a7a1 ("Staging: staging: fbtft: Switch to the gpio descriptor interface")
	Has these problem(s):
	        - Subject does not match target commit subject
	          Just use
		                git log -1 --format='Fixes: %h ("%s")'

Please fix up for your next version of this series.

thanks,

greg k-h