The code has a variable to change the polarity of the PWM backlight control but
it was not being initialized. This patch adds a devicetree entry to set the
variable if required.
Signed-off-by: Michael Welling <mwelling@xxxxxxxx>
---
.../devicetree/bindings/video/atmel,lcdc.txt | 1 +
drivers/video/fbdev/atmel_lcdfb.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/video/atmel,lcdc.txt b/Documentation/devicetree/bindings/video/atmel,lcdc.txt
index 1ec175e..b75af94 100644
--- a/Documentation/devicetree/bindings/video/atmel,lcdc.txt
+++ b/Documentation/devicetree/bindings/video/atmel,lcdc.txt
@@ -46,6 +46,7 @@ Required properties (as per of_videomode_helper):
Optional properties (as per of_videomode_helper):
- atmel,lcdcon-backlight: enable backlight
+ - atmel,lcdcon-backlight-inverted: invert backlight PWM polarity
- atmel,lcd-wiring-mode: lcd wiring mode "RGB" or "BRG"
- atmel,power-control-gpio: gpio to power on or off the LCD (as many as needed)
diff --git a/drivers/video/fbdev/atmel_lcdfb.c b/drivers/video/fbdev/atmel_lcdfb.c
index d36e830..92640d4 100644
--- a/drivers/video/fbdev/atmel_lcdfb.c
+++ b/drivers/video/fbdev/atmel_lcdfb.c
@@ -290,7 +290,7 @@ static void init_contrast(struct atmel_lcdfb_info *sinfo)
/* contrast pwm can be 'inverted' */
if (pdata->lcdcon_pol_negative)
- contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
+ contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
/* have some default contrast/backlight settings */
lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
@@ -1097,6 +1097,7 @@ static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
pdata->lcd_wiring_mode = ret;
pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
+ pdata->lcdcon_pol_negative = of_property_read_bool(display_np, "atmel,lcdcon-backlight-inverted");
timings = of_get_display_timings(display_np);
if (!timings) {
--
1.7.9.5
--
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