linux-kernel - Re: [PATCH v2 4/4] gpio: i8255: Migrate to regmap API

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Date:   Sun, 13 Nov 2022 14:52:39 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     William Breathitt Gray <william.gray@...aro.org>
Cc:     linus.walleij@...aro.org, brgl@...ev.pl,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        michael@...le.cc, broonie@...nel.org
Subject: Re: [PATCH v2 4/4] gpio: i8255: Migrate to regmap API

On Thu, Nov 10, 2022 at 08:55:53PM -0500, William Breathitt Gray wrote:
> The regmap API supports IO port accessors so we can take advantage of
> regmap abstractions rather than handling access to the device registers
> directly in the driver. The 104-dio-48e and gpio-mm modules depend on
> the i8255 library and are thus updated accordingly.
> 
> By leveraging the gpio_regmap API, the i8255 library is reduced to
> simply a devm_i8255_regmap_register() function, a configuration
> structure struct i8255_regmap_config, and a helper macro
> i8255_volatile_regmap_range() provided to simplify volatile PPI register
> hinting for the regmap.

> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Suggested-by?
(I'm not insisting, just consider if it's appropriate to use here or in the
 other patches)

> Signed-off-by: William Breathitt Gray <william.gray@...aro.org>
> ---
>  drivers/gpio/Kconfig            |   2 +
>  drivers/gpio/gpio-104-dio-48e.c | 397 ++++++++++-------------------
>  drivers/gpio/gpio-gpio-mm.c     | 151 +++--------
>  drivers/gpio/gpio-i8255.c       | 429 +++++++++++---------------------
>  drivers/gpio/gpio-i8255.h       |  80 +++---

Can we actually split this to a few steps:
 - providing gpio-i8255-regmap
 - providing gpio-mm-regmap
 - converting the driver
 - removing not used modules (one by one)
?

In this case if any regression somewhere appears, we can always perform a
(semi-)revert for a certain driver.


-- 
With Best Regards,
Andy Shevchenko