linux-kernel - Re: [PATCH v3 0/5] gpio: aggregator: Incorporate gpio-delay functionality

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Message-ID: <4392854.e9J7NaK4W3@steina-w>
Date:   Fri, 16 Jun 2023 11:01:17 +0200
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>
Subject: Re: [PATCH v3 0/5] gpio: aggregator: Incorporate gpio-delay functionality

Hi Andy,

Am Donnerstag, 15. Juni 2023, 15:20:18 CEST schrieb Andy Shevchenko:
> The newly appeared gpio-delay module enables external signal delay lines
> that may be connected to the GPIOs. But at the same time it copies the
> GPIO forwarder functionality. Besides that the approach does not scale.
> If we would have another external component, we would need yet another
> driver. That's why I think, and seems others support me, better to
> enable such a functionality inside GPIO aggregator driver.
> 
> Patch 1 is a cleanup that may be applied independently on the decision
> about the rest.
> 
> Please, test and comment! Alexander, I would appreciate your tag.

This works on my platform:
Tested-by: Alexander Stein <alexander.stein@...tq-group.com>

> In v3:
> - added new patch 3 to prevent device removal from sysfs
> - switched to feature in driver data instead of "compatible" (Geert)
> - applied tags (Geert, Linus)
> - left DT bindings untouched, can be amended later on
> 
> In v2:
> - split as a series
> - covered CONFIG_OF_GPIO=n case
> - removed the gpio-delay
> - moved gpio-delay Kconfig help to the comment in the code
> - left udelay() call untouched as recommended by documentation
> 
> Andy Shevchenko (5):
>   gpio: aggregator: Remove CONFIG_OF and of_match_ptr() protections
>   gpio: aggregator: Support delay for setting up individual GPIOs
>   gpio: aggregator: Prevent collisions between DT and user device IDs
>   gpio: aggregator: Set up a parser of delay line parameters
>   gpio: delay: Remove duplicative functionality
> 
>  drivers/gpio/Kconfig           |   9 --
>  drivers/gpio/Makefile          |   1 -
>  drivers/gpio/gpio-aggregator.c | 113 +++++++++++++++++++++--
>  drivers/gpio/gpio-delay.c      | 164 ---------------------------------
>  4 files changed, 106 insertions(+), 181 deletions(-)
>  delete mode 100644 drivers/gpio/gpio-delay.c


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