linux-kernel - Re: [PATCH 3/4] gpio: palmas: Add support for Palams GPIO

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Date:	Thu, 10 Jan 2013 11:57:10 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	sameo@...ux.intel.com, grant.likely@...retlab.ca,
	akpm@...ux-foundation.org, a.zummo@...ertech.it,
	broonie@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
	rtc-linux@...glegroups.com
Subject: Re: [PATCH 3/4] gpio: palmas: Add support for Palams GPIO

On Thu, Jan 3, 2013 at 11:46 AM, Laxman Dewangan <ldewangan@...dia.com> wrote:

> Add gpio driver for TI Palmas series PMIC. This has 8 gpio which can
> work as input/output.
>
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>

This driver seems unnecessary. Can't you just use
drivers/gpio/gpio-generic.c ?

> +static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
> +{
> +       struct palmas_gpio *pg = to_palmas_gpio(gc);
> +       struct palmas *palmas = pg->palmas;
> +
> +       return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
> +}

Why are you implementing this for a driver which does not even expose
the ability to trigger IRQs? If it's supposed to support IRQs it should
register a struct irq_chip.

Yours,
Linus Walleij
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