linux-kernel - Re: [PATCH] gpio:gpio-pl2303: add gpio driver for GPIOs on PL2303

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Date:	Sun, 20 Jul 2014 22:11:30 +0200
From:	Andreas Mohr <andi@...as.de>
To:	Wang YanQing <udknight@...il.com>
Cc:	linus.walleij@...aro.org, gregkh@...uxfoundation.org,
	jhovold@...il.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio:gpio-pl2303: add gpio driver for GPIOs on PL2303

Hi,

> +#include <linux/slab.h>
> +#include <linux/usb.h>
> +#include <linux/gpio.h>



> +	pl2303_gpio_write(&pl2303_gpio->gpio_chip);
> +
> +	ret = gpiochip_add(&pl2303_gpio->gpio_chip);
> +	if (ret < 0) {


AFAICS that stuff is conditional:ed by #ifdef CONFIG_GPIOLIB in
gpio.h (or rather, its internally included asm-generic/gpio.h)

Thus

> +config GPIO_PL2303
> +	tristate "USB Prolific 2303 gpio support"
> +	depends on USB_SERIAL_PL2303
> +	help
> +	  Enable support for GPIOs on USB Prolific 2303
> +	  It support two GPIOs on PL2303HX currently.

quite likely a
	depends on GPIOLIB && ...
is missing here (as is done with several other GPIO support drivers
in the same Kconfig)

Thanks for this nicely functionality-enhancing serial driver addition,

Andreas Mohr
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