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Date:   Sat, 31 Oct 2020 21:56:17 +0100
From:   Sam Ravnborg <>
To:     Lubomir Rintel <>
Cc:     Andrzej Hajda <>,
        Daniel Vetter <>,
        David Airlie <>,
        Rob Herring <>,
        Neil Armstrong <>,
        Laurent Pinchart <>,
        Jonas Karlman <>,
        Jernej Skrabec <>,,,, Rob Herring <>
Subject: Re: [PATCH v6 2/2] drm/bridge: hx8837: add a Himax HX8837 display
 controller driver

Hi Lubomir.

> > 
> > Please use a depends - using select on a symbol with a prompt is always
> > wrong. Yeah, I know you then need to enable backlight to see this
> > driver. Sorry, but this is the best we can do now.
> > Many other drivers can cope with depends here.
> This results in a dependency loop:
>   drivers/video/fbdev/Kconfig:12:error: recursive dependency detected!
>   drivers/video/fbdev/Kconfig:12: symbol FB is selected by DRM_KMS_FB_HELPER
>   drivers/gpu/drm/Kconfig:80:     symbol DRM_KMS_FB_HELPER depends on DRM_KMS_HELPER
>   drivers/gpu/drm/Kconfig:74:     symbol DRM_KMS_HELPER is selected by DRM_HIMAX_HX8837
>   drivers/gpu/drm/bridge/Kconfig:51:      symbol DRM_HIMAX_HX8837 depends on BACKLIGHT_CLASS_DEVICE
>   drivers/video/backlight/Kconfig:143:    symbol BACKLIGHT_CLASS_DEVICE is selected by FB_BACKLIGHT
>   drivers/video/fbdev/Kconfig:187:        symbol FB_BACKLIGHT depends on FB
> Unfortunately I have no idea how to resolve it at the moment.
> I suppose I can look further into it if necessary. Or is it okay if I
> leave it at select BACKLIGHT_CLASS_DEVICE for now?

Sigh, leave it as a select then :-(
The "sigh" is not directed at you but the mess this
BACKLIGHT_CLASS_DEVICE is and the limitations of Kconfig.


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