linux-kernel - Re: [PATCH] gpio: better lookup method for platform GPIOs

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Message-ID: <20131129115748.GB3942@xps8300>
Date:	Fri, 29 Nov 2013 13:57:49 +0200
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Rhyland Klein <rklein@...dia.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: better lookup method for platform GPIOs

Hi,

On Thu, Nov 28, 2013 at 05:46:28PM +0900, Alexandre Courbot wrote:
> @@ -88,16 +89,20 @@ Note that GPIO_LOOKUP() is just a shortcut to GPIO_LOOKUP_IDX() where idx = 0.
>  
>  A lookup table can then be defined as follows:
>  
> -	struct gpiod_lookup gpios_table[] = {
> -	GPIO_LOOKUP_IDX("gpio.0", 15, "foo.0", "led", 0, GPIO_ACTIVE_HIGH),
> -	GPIO_LOOKUP_IDX("gpio.0", 16, "foo.0", "led", 1, GPIO_ACTIVE_HIGH),
> -	GPIO_LOOKUP_IDX("gpio.0", 17, "foo.0", "led", 2, GPIO_ACTIVE_HIGH),
> -	GPIO_LOOKUP("gpio.0", 1, "foo.0", "power", GPIO_ACTIVE_LOW),
> -	};
> +struct gpiod_lookup_table gpios_table = {
> +	.dev_id = "foo.0",
> +	.size = 4,
> +	.table = {
> +	GPIO_LOOKUP_IDX("gpio.0", 15, "led", 0, GPIO_ACTIVE_HIGH),
> +	GPIO_LOOKUP_IDX("gpio.0", 16, "led", 1, GPIO_ACTIVE_HIGH),
> +	GPIO_LOOKUP_IDX("gpio.0", 17, "led", 2, GPIO_ACTIVE_HIGH),
> +	GPIO_LOOKUP("gpio.0", 1, "power", GPIO_ACTIVE_LOW),
> +	},
> +};

Instead of using the size variable, wouldn't it be more clear to
expect the array to be null terminated?

>  And the table can be added by the board code as follows:
>  
> -	gpiod_add_table(gpios_table, ARRAY_SIZE(gpios_table));
> +	gpiod_add_lookup_table(&gpios_table);

Remove "&" from the above.

Thanks,

-- 
heikki
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