drm/panel: novatek,nt39016: Remove 'dev' field in priv struct

There is already a 'struct device' pointer in the drm_panel structure,
that we can access easily from our priv structure, so there's no need
for a separate 'dev' field there.
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200820121256.32037-3-paul@crapouillou.net

drivers/gpu/drm/panel/panel-novatek-nt39016.c

@@ -56,7 +56,6 @@ struct nt39016_panel_info {
 
 struct nt39016 {
 	struct drm_panel drm_panel;
-	struct device *dev;
 	struct regmap *map;
 	struct regulator *supply;
 	const struct nt39016_panel_info *panel_info;
@@ -124,7 +123,7 @@ static int nt39016_prepare(struct drm_panel *drm_panel)
 
 	err = regulator_enable(panel->supply);
 	if (err) {
-		dev_err(panel->dev, "Failed to enable power supply: %d\n", err);
+		dev_err(drm_panel->dev, "Failed to enable power supply: %d\n", err);
 		return err;
 	}
 
@@ -143,7 +142,7 @@ static int nt39016_prepare(struct drm_panel *drm_panel)
 	err = regmap_multi_reg_write(panel->map, nt39016_panel_regs,
 				     ARRAY_SIZE(nt39016_panel_regs));
 	if (err) {
-		dev_err(panel->dev, "Failed to init registers: %d\n", err);
+		dev_err(drm_panel->dev, "Failed to init registers: %d\n", err);
 		goto err_disable_regulator;
 	}
 
@@ -173,7 +172,7 @@ static int nt39016_enable(struct drm_panel *drm_panel)
 	ret = regmap_write(panel->map, NT39016_REG_SYSTEM,
 			   NT39016_SYSTEM_RESET_N | NT39016_SYSTEM_STANDBY);
 	if (ret) {
-		dev_err(panel->dev, "Unable to enable panel: %d\n", ret);
+		dev_err(drm_panel->dev, "Unable to enable panel: %d\n", ret);
 		return ret;
 	}
 
@@ -193,7 +192,7 @@ static int nt39016_disable(struct drm_panel *drm_panel)
 	err = regmap_write(panel->map, NT39016_REG_SYSTEM,
 			   NT39016_SYSTEM_RESET_N);
 	if (err) {
-		dev_err(panel->dev, "Unable to disable panel: %d\n", err);
+		dev_err(drm_panel->dev, "Unable to disable panel: %d\n", err);
 		return err;
 	}
 
@@ -252,7 +251,6 @@ static int nt39016_probe(struct spi_device *spi)
 	if (!panel)
 		return -ENOMEM;
 
-	panel->dev = dev;
 	spi_set_drvdata(spi, panel);
 
 	panel->panel_info = of_device_get_match_data(dev);