linux-kernel - Re: [PATCH v4 1/4] Input: ads7846

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Date:   Mon, 8 May 2023 14:24:54 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Aaro Koskinen <aaro.koskinen@....fi>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Mark Brown <broonie@...nel.org>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Andreas Kemnade <andreas@...nade.info>,
        Helge Deller <deller@....de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-input@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-mmc@...r.kernel.org
Subject: Re: [PATCH v4 1/4] Input: ads7846 - Convert to use software nodes

On Mon, May 08, 2023 at 11:20:06PM +0200, Linus Walleij wrote:
> The Nokia 770 is using GPIOs from the global numberspace on the
> CBUS node to pass down to the LCD controller. This regresses when we
> let the OMAP GPIO driver use dynamic GPIO base.
> 
> The Nokia 770 now has dynamic allocation of IRQ numbers, so this
> needs to be fixed for it to work.
> 
> As this is the only user of LCD MIPID we can easily augment the
> driver to use a GPIO descriptor instead and resolve the issue.
> 
> The platform data .shutdown() callback wasn't even used in the
> code, but we encode a shutdown asserting RESET in the remove()
> callback for completeness sake.
> 
> The CBUS also has the ADS7846 touchscreen attached.
> 
> Populate the devices on the Nokia 770 CBUS I2C using software
> nodes instead of platform data quirks. This includes the LCD
> and the ADS7846 touchscreen so the conversion just brings the LCD
> along with it as software nodes is an all-or-nothing design
> pattern.
> 
> The ADS7846 has some limited support for using GPIO descriptors,
> let's convert it over completely to using device properties and then
> fix all remaining boardfile users to provide all platform data using
> software nodes.
> 
> Dump the of includes and of_match_ptr() in the ADS7846 driver as part
> of the job.
> 
> Since we have to move ADS7846 over to obtaining the GPIOs it is
> using exclusively from descriptors, we provide descriptor tables
> for the two remaining in-kernel boardfiles using ADS7846:
> 
> - PXA Spitz
> - MIPS Alchemy DB1000 development board
> 
> It was too hard for me to include software node conversion of
> these two remaining users at this time: the spitz is using a
> hscync callback in the platform data that would require further
> GPIO descriptor conversion of the Spitz, and moving the hsync
> callback down into the driver: it will just become too big of
> a job, but it can be done separately.
> 
> The MIPS Alchemy DB1000 is simply something I cannot test, so take
> the easier approach of just providing some GPIO descriptors in
> this case as I don't want the patch to grow too intrusive.
> 
> As we see that several device trees have incorrect polarity flags
> and just expect to bypass the gpiolib polarity handling, fix up
> all device trees too, in a separate patch.
> 
> Suggested-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Fixes: 92bf78b33b0b ("gpio: omap: use dynamic allocation of base")
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
> ChangeLog v3->v4:
> - Fix all board file polarity flags to be active low, because
>   this pendown signal is active low.
> - Fix all erroneous device trees too.
> - Drop some unnecessary commas.
> ChangeLog v2->v3:
> - Drop leftover OF ifdefs no longer needed and causing compile
>   errors.
> ---
>  arch/arm/mach-omap1/board-nokia770.c    |  98 +++++++++++++++++----------
>  arch/arm/mach-pxa/spitz.c               |  11 +++-
>  arch/mips/alchemy/devboards/db1000.c    |  11 +++-
>  drivers/input/touchscreen/ads7846.c     | 113 ++++++++++++--------------------

For input:

Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

In general:

Reviewed-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

Thanks.

-- 
Dmitry