linux-kernel - Re: [PATCH V3 0/5] gpio: davinci: Redesign driver to accommodate ngpios in one gpio chip

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Message-ID: <8e91ed3d-6b60-606c-790f-cc5b6cf5ea41@ti.com>
Date:   Tue, 17 Jan 2017 22:02:41 +0530
From:   Keerthy <j-keerthy@...com>
To:     <linus.walleij@...aro.org>
CC:     <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <gnurou@...il.com>, <grygorii.strashko@...com>, <t-kristo@...com>
Subject: Re: [PATCH V3 0/5] gpio: davinci: Redesign driver to accommodate
 ngpios in one gpio chip



On Tuesday 17 January 2017 09:49 PM, Keerthy wrote:
> The Davinci GPIO driver is implemented to work with one monolithic
> Davinci GPIO platform device which may have up to Y(144) gpios.
> The Davinci GPIO driver instantiates number of GPIO chips with
> max 32 gpio pins per each during initialization and one IRQ domain.
> So, the current GPIO's  opjects structure is:
>
> <platform device> Davinci GPIO controller
>  |- <gpio0_chip0> ------|
>  ...                    |--- irq_domain (hwirq [0..143])
>  |- <gpio0_chipN> ------|
>
> Current driver creates one chip for every 32 GPIOs in a controller.
> This was a limitation earlier now there is no need for that. Hence
> redesigning the driver to create one gpio chip for all the ngpio
> in the controller.
>
> |- <gpio0_chip0> ------|--- irq_domain (hwirq [0..143]).
>
> The previous discussion on this can be found here:
> https://www.spinics.net/lists/linux-omap/msg132869.html
>
> The series is posted on top of:
>
> https://lkml.org/lkml/2017/1/4/94

This is based on "devel" branch of the gpio tree.

>
> Changes in v2:
>
>   * Optimized the re-design patch.
>   * Added couple of code clean ups after the re-design.
>   * Included v2 of https://patchwork.ozlabs.org/patch/710855/
>
> Changes in v3:
>
>   * Removed one of the clean up patches. As the macros were needed.
>
> Keerthy (5):
>   gpio: davinci: Remove gpio2regs function to accommodate multi
>     instances
>   gpio: davinci: Remove unwanted blank line
>   gpio: davinci: Redesign driver to accommodate ngpios in one gpio chip
>   gpio: davinci: Add support for multiple GPIO controllers
>   gpio: davinci: Remove custom .xlate
>   gpio: davinci: Remove redundant macros
>
>  drivers/gpio/gpio-davinci.c                | 174 +++++++++++++----------------
>  include/linux/platform_data/gpio-davinci.h |  20 ++--
>  2 files changed, 90 insertions(+), 104 deletions(-)
>