linux-kernel - [PATCH 3/3] drm/panel: add backlight dependency for sitronix-st7789v

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Date:   Wed, 19 Apr 2017 20:03:08 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>
Cc:     Arnd Bergmann <arnd@...db.de>, Donghwa Lee <dh09.lee@...sung.com>,
        Hoegeun Kwon <hoegeun.kwon@...sung.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] drm/panel: add backlight dependency for sitronix-st7789v

Without the dependency, we run into a link error:

drivers/gpu/drm/panel/panel-sitronix-st7789v.o: In function `st7789v_probe':
panel-sitronix-st7789v.c:(.text.st7789v_probe+0xc0): undefined reference to `of_find_backlight_by_node'

Fixes: 7142afb3a186 ("drm/panel: Add driver for sitronix ST7789V LCD controller")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/panel/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 6eb9774284df..04d068177e16 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -101,6 +101,7 @@ config DRM_PANEL_SHARP_LS043T1LE01
 config DRM_PANEL_SITRONIX_ST7789V
 	tristate "Sitronix ST7789V panel"
 	depends on OF && SPI
+	depends on BACKLIGHT_CLASS_DEVICE
 	help
 	  Say Y here if you want to enable support for the Sitronix
 	  ST7789V controller for 240x320 LCD panels
-- 
2.9.0