linux-kernel - Re: [PATCH v5 RESEND 2/3] backlight: apple_dwi

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Message-ID: <Z65bQeITMp1mpHp8@aspen.lan>
Date: Thu, 13 Feb 2025 20:51:13 +0000
From: Daniel Thompson <danielt@...nel.org>
To: Nick Chan <towinchenmi@...il.com>
Cc: Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Lee Jones <lee@...nel.org>, Jingoo Han <jingoohan1@...il.com>,
	Pavel Machek <pavel@....cz>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Helge Deller <deller@....de>,
	asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v5 RESEND 2/3] backlight: apple_dwi_bl: Add Apple DWI
 backlight driver

On Mon, Feb 03, 2025 at 07:50:33PM +0800, Nick Chan wrote:
> Add driver for backlight controllers attached via Apple DWI 2-wire
> interface, which is found on some Apple iPhones, iPads and iPod touches
> with a LCD display.
>
> Although there is an existing apple_bl driver, it is for backlight
> controllers on Intel Macs attached via PCI, which is completely different
> from the Samsung-derived DWI block.
>
> Signed-off-by: Nick Chan <towinchenmi@...il.com>
> ---
>  drivers/video/backlight/Kconfig        |  12 +++
>  drivers/video/backlight/Makefile       |   1 +
>  drivers/video/backlight/apple_dwi_bl.c | 123 +++++++++++++++++++++++++
>  3 files changed, 136 insertions(+)
>  create mode 100644 drivers/video/backlight/apple_dwi_bl.c
>
> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> index 3614a5d29c71..c6168727900a 100644
> --- a/drivers/video/backlight/Kconfig
> +++ b/drivers/video/backlight/Kconfig
> @@ -290,6 +290,18 @@ config BACKLIGHT_APPLE
>  	  If you have an Intel-based Apple say Y to enable a driver for its
>  	  backlight.
>
> +config BACKLIGHT_APPLE_DWI
> +	tristate "Apple DWI 2-Wire Interface Backlight Driver"
> +	depends on ARCH_APPLE || COMPILE_TEST
> +	default y

Sorry to pick this up late and on a resend but... I can't come up with
any justification for "default y" in this driver.

Other than that this is a really tidy driver so with that changed please
add:
Reviewed-by: Daniel Thompson (RISCstar) <danielt@...nel.org>


Daniel.