linux-kernel - Re: [PATCH v3 0/6] gpio: Implement and utilize register structures for ISA drivers

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Date:   Tue, 19 Jul 2022 06:50:53 -0400
From:   William Breathitt Gray <william.gray@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Hentges <jhentges@...esio.com>,
        Jay Dolan <jay.dolan@...esio.com>,
        Fred Eckert <Frede@...laser.com>,
        Paul Demetrotion <pdemetrotion@...systems.com>,
        techsupport@...systems.com,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v3 0/6] gpio: Implement and utilize register structures
 for ISA drivers

On Tue, Jul 19, 2022 at 10:09:33AM +0200, Bartosz Golaszewski wrote:
> On Mon, Jul 18, 2022 at 10:56 PM William Breathitt Gray
> <william.gray@...aro.org> wrote:
> >
> > Changes in v3:
> >  - Updated contact information in MAINTAINERS
> >  - Added help text for GPIO_I8255 Kconfig option
> >  - Move include/linux/gpio/i8255.h to drivers/gpio/gpio-i8255.h
> >  - Include "gpio-i8255.h" instead of <linux/gpio/i8255.h>
> >  - Include linux/types.h instead of linux/compiler_types.h
> >  - Add underscores for *PORTC_LOWER* and *PORTC_UPPER* defines
> >  - Move (offset % 8) expression to a port_offset const above the io_port
> >    const in i8255_direction_mask(); this should help optimize assembly
> >    instructions on some architectures
> >  - Implement an opaque i8255_state struct to organize and access i8255
> >    device states; this replaces the control_state array passed to
> >    various i8255 library functions in previous patchsets
> >  - Implement and provide a i8255_state_init() function to initialize the
> >    i8255_state struct for a consumer
> >  - Use a spinlock within i8255 library functions to protect access to
> >    i8255 states and synchronize I/O operations; a spinlock is used so
> >    that these functions may be used within an interrupt context
> >  - Export the i8255 library symbols within a new I8255 namespace
> >  - Update the 104-dio-48e, 104-idi-48, gpio-mm drivers to use the new
> >    i8255_state struct and I8255 namespace
> >
> > The PC104/ISA drivers were updated to use I/O memory accessor calls such
> > as ioread8()/iowrite8() in a previous patch series [0]. This
> > patchset is a continuation of the effort to improve the code readability
> > and reduce magic numbers by implementing and utilizing named register
> > data structures.
> >
> > One of the benefits is that we can now observe more easily similarities
> > in devices that share similar interfaces; such as the i8255 interfaces
> > used by the 104-DIO-48E, 104-IDI-48, and GPIO-MM drivers -- as well as
> > the similar interface used by the 104-IDIO-16 and PCI-IDIO-16 drivers.
> >
> > A new module supporting the Intel 8255 interface is introduced to
> > consolidate the common code found among the 104-DIO-48E, 104-IDI-48, and
> > GPIO-MM drivers.
> >
> > [0] https://lore.kernel.org/all/cover.1652201921.git.william.gray@linaro.org/
> >
> > William Breathitt Gray (6):
> >   gpio: ws16c48: Implement and utilize register structures
> >   gpio: 104-idio-16: Implement and utilize register structures
> >   gpio: i8255: Introduce the Intel 8255 interface library module
> >   gpio: 104-dio-48e: Implement and utilize register structures
> >   gpio: 104-idi-48: Implement and utilize register structures
> >   gpio: gpio-mm: Implement and utilize register structures
> >
> 
> Hey William!
> 
> Are you planning to submit a fourth version anytime soon? I am willing
> to take it for the next merge window if it arrives soon - like
> tomorrow at the latest.
> 
> Bart

Hi Bart,

I'm incorporating Andy's comments for v4, and I expect it should be
ready later today for you to pick up.

Thanks,

William Breathitt Gray

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