linux-kernel - Re: [PATCH] gpio-mcp23s08: Build I2C support even when CONFIG

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Date:	Sun, 4 Nov 2012 19:16:17 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	"Daniel M. Weeks" <dan@...weeks.net>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio-mcp23s08: Build I2C support even when CONFIG_I2C=m

On Fri, Nov 2, 2012 at 1:09 AM, Daniel M. Weeks <dan@...weeks.net> wrote:

> The driver has both SPI and I2C pieces. The appropriate pieces are built based
> on whether SPI and/or I2C is/are enabled. However, it was only checking if I2C
> was built-in, never if it was built as a module. This patch checks for either
> since building both this driver and I2C as modules is possible.

Good catch!

> -#ifdef CONFIG_I2C
> +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)

But don't do it like this, there are already helpers for exactly this.

Do:

#if IS_ENABLED(CONFIG_I2C)

Read include/linux/kconfig.h if in doubt...

Looking forward to v2!

Yours,
Linus Walleij
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