From: Lothar Waßmann <LW@KARO-electronics.de>
Date: Wed, 20 Aug 2014 06:38:36 +0000 (+0200)
Subject: pwm-backlight: Fix bogus request for GPIO#0 when instantiated from DT
X-Git-Tag: omap-fixes-against-v3.17-rc3~33^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=937222c4dda495277a8dfbc18bf7e54fe670105c;p=pandora-kernel.git

pwm-backlight: Fix bogus request for GPIO#0 when instantiated from DT

commit 257462dbf3ed ("pwm-backlight: switch to gpiod interface")
introduced a regression leading to acquiring a bogus GPIO-0 when
configured from DT without an 'enable-gpios' property.
The driver will happily accept the 0 initialized 'enable_gpio' member
of the struct platform_pwm_backlight_data as valid gpio number, and
request this GPIO as enable pin. In case of multiple driver instances,
the second will fail to register with the error message:
pwm-backlight backlight1.23: failed to request GPIO#0: -16

Fix this by setting enable_gpio in the pdata struct to -EINVAL.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---

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