linux-kernel - Re: [PATCH v2 3/6] hid: add backlight support to PicoLCD device

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Date:	Mon, 22 Mar 2010 09:59:07 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Rick L. Vinyard Jr." <rvinyard@...nmsu.edu>,
	Nicu Pavel <npavel@...ner.com>,
	Oliver Neukum <oliver@...kum.org>,
	Jaya Kumar <jayakumar.lkml@...il.com>,
	Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH v2 3/6] hid: add backlight support to PicoLCD device

On Sat, 20 Mar 2010, Bruno Prémont wrote:

> Add backlight support to PicoLCD device.
> 
> Backlight support depends on backlight class and is only being
> compiled if backlight class has been selected.
> 
> Signed-off-by: Bruno Prémont <bonbons@...ux-vserver.org>
> ---
>  drivers/hid/Kconfig       |    2 +-
>  drivers/hid/hid-picolcd.c |  134 ++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 134 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
> index a474bcd..5ec3cb7 100644
> --- a/drivers/hid/Kconfig
> +++ b/drivers/hid/Kconfig
> @@ -243,8 +243,8 @@ config HID_PICOLCD
>  	  - Keypad
>  	  - Switching between Firmware and Flash mode
>  	  - Framebuffer for monochrome 256x64 display
> +	  - Backlight control    (needs CONFIG_BACKLIGHT_CLASS_DEVICE)

Wouldn't it be better to have Kconfig rules actually resolve the 
dependency?

I don't see any issue with HID_PICOLCD directly selecting 
BACKLIGHT_CLASS_DEVICE. Or you can do a separate sub-option for that, if 
you really want to avoid the direct dependency of the whole driver.

Thanks,

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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