drm/omap: panel-tpo-td028ttec1: add backlight support

This panel has a backlight, so fetch it from devicetree using the
corresponding property as documented in panel-common.txt. It is
implemented the same way as in panel-dpi.c
This ensures the backlight is also disabled when the display is
turned off like when doing xset dpms force off.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c b/drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c
index fa80d4f..2ad161e 100644 (file)
--- a/drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c
+++ b/drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c
@@ -35,6 +35,8 @@ struct panel_drv_data {
 
        struct videomode vm;
 
+       struct backlight_device *backlight;
+
        struct spi_device *spi_dev;
 };
 
@@ -258,12 +260,16 @@ static void td028ttec1_panel_enable(struct omap_dss_device *dssdev)
 
        if (r)
                dev_err(dssdev->dev, "%s: write error\n", __func__);
+
+       backlight_enable(ddata->backlight);
 }
 
 static void td028ttec1_panel_disable(struct omap_dss_device *dssdev)
 {
        struct panel_drv_data *ddata = to_panel_data(dssdev);
 
+       backlight_disable(ddata->backlight);
+
        dev_dbg(dssdev->dev, "td028ttec1_panel_disable()\n");
 
        jbt_ret_write_0(ddata, JBT_REG_DISPLAY_OFF);
@@ -311,6 +317,10 @@ static int td028ttec1_panel_probe(struct spi_device *spi)
        if (ddata == NULL)
                return -ENOMEM;
 
+       ddata->backlight = devm_of_find_backlight(&spi->dev);
+       if (IS_ERR(ddata->backlight))
+               return PTR_ERR(ddata->backlight);
+
        dev_set_drvdata(&spi->dev, ddata);
 
        ddata->spi_dev = spi;