linux-kernel - Re: [PATCH 2/2] gpio / ACPI: add support for GPIO operation regions

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Date:	Fri, 20 Sep 2013 21:21:37 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alexandre Courbot <acourbot@...dia.com>
Subject: Re: [PATCH 2/2] gpio / ACPI: add support for GPIO operation regions

On Fri, Sep 13, 2013 at 5:14 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:

> diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
(...)
> +struct acpi_gpio_chip_data {
> +       /*
> +        * acpi_install_address_space_handler() wants to put the connection
> +        * information at the start of the context structure we pass it, in
> +        * case we are dealing with GPIO operation regions.
> +        */
> +       struct acpi_connection_info ci;
> +       struct gpio_chip *chip;
> +       struct list_head *evt_pins;
> +};

Consider just naming this acpi_gpio_chip, as it is obviously some
generic container that you will keep adding to.

I'm uncertain how things work, it wouldn't add something to have
struct gpio_chip be a true member (not a pointer) so you can
allocate one thing from the drivers, and e.g. use container_of()
to get from the gpio_chip to the acpi_gpio_chip[_data]?

Yours,
Linus Walleij
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