drm/panel: Use of_find_backlight helper

Replace of_find_backlight_by_node and of the code around it
with of_find_backlight helper to avoid repetition of code.

Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Meghana Madhyastha <meghana.madhyastha@gmail.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/140d01afb138d687680b2d1776a4c101c9fa9a0a.1516810725.git.meghana.madhyastha@gmail.com

3 files changed, 13 insertions, 66 deletions

diff --git a/drivers/gpu/drm/panel/panel-innolux-p079zca.c b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
index 4c1b29eec2a5..57df39b5c589 100644
--- a/drivers/gpu/drm/panel/panel-innolux-p079zca.c
+++ b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
@@ -215,7 +215,6 @@ MODULE_DEVICE_TABLE(of, innolux_of_match);
 static int innolux_panel_add(struct innolux_panel *innolux)
 {
         struct device *dev = &innolux->link->dev;
-        struct device_node *np;
         int err;
 
         innolux->supply = devm_regulator_get(dev, "power");
@@ -230,37 +229,22 @@ static int innolux_panel_add(struct innolux_panel *innolux)
                 innolux->enable_gpio = NULL;
         }
 
-        np = of_parse_phandle(dev->of_node, "backlight", 0);
-        if (np) {
-                innolux->backlight = of_find_backlight_by_node(np);
-                of_node_put(np);
+        innolux->backlight = devm_of_find_backlight(dev);
 
-                if (!innolux->backlight)
-                        return -EPROBE_DEFER;
-        }
+        if (IS_ERR(innolux->backlight))
+                return PTR_ERR(innolux->backlight);
 
         drm_panel_init(&innolux->base);
         innolux->base.funcs = &innolux_panel_funcs;
         innolux->base.dev = &innolux->link->dev;
 
-        err = drm_panel_add(&innolux->base);
-        if (err < 0)
-                goto put_backlight;
-
-        return 0;
-
-put_backlight:
-        put_device(&innolux->backlight->dev);
-
-        return err;
+        return drm_panel_add(&innolux->base);
 }
 
 static void innolux_panel_del(struct innolux_panel *innolux)
 {
         if (innolux->base.dev)
                 drm_panel_remove(&innolux->base);
-
-        put_device(&innolux->backlight->dev);
 }
 
 static int innolux_panel_probe(struct mipi_dsi_device *dsi)
diff --git a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
index 072c0fc794d6..6bf8730f1a21 100644
--- a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
@@ -318,8 +318,7 @@ MODULE_DEVICE_TABLE(of, sharp_of_match);
 
 static int sharp_panel_add(struct sharp_panel *sharp)
 {
-        struct device_node *np;
-        int err;
+        struct device *dev = &sharp->link1->dev;
 
         sharp->mode = &default_mode;
 
@@ -327,30 +326,16 @@ static int sharp_panel_add(struct sharp_panel *sharp)
         if (IS_ERR(sharp->supply))
                 return PTR_ERR(sharp->supply);
 
-        np = of_parse_phandle(sharp->link1->dev.of_node, "backlight", 0);
-        if (np) {
-                sharp->backlight = of_find_backlight_by_node(np);
-                of_node_put(np);
+        sharp->backlight = devm_of_find_backlight(dev);
 
-                if (!sharp->backlight)
-                        return -EPROBE_DEFER;
-        }
+        if (IS_ERR(sharp->backlight))
+                return PTR_ERR(sharp->backlight);
 
         drm_panel_init(&sharp->base);
         sharp->base.funcs = &sharp_panel_funcs;
         sharp->base.dev = &sharp->link1->dev;
 
-        err = drm_panel_add(&sharp->base);
-        if (err < 0)
-                goto put_backlight;
-
-        return 0;
-
-put_backlight:
-        if (sharp->backlight)
-                put_device(&sharp->backlight->dev);
-
-        return err;
+        return drm_panel_add(&sharp->base);
 }
 
 static void sharp_panel_del(struct sharp_panel *sharp)
@@ -358,9 +343,6 @@ static void sharp_panel_del(struct sharp_panel *sharp)
         if (sharp->base.dev)
                 drm_panel_remove(&sharp->base);
 
-        if (sharp->backlight)
-                put_device(&sharp->backlight->dev);
-
         if (sharp->link2)
                 put_device(&sharp->link2->dev);
 }
diff --git a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
index 8a5137963c7d..494aa9b1628a 100644
--- a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
@@ -253,8 +253,6 @@ static const struct drm_panel_funcs sharp_nt_panel_funcs = {
 static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
 {
         struct device *dev = &sharp_nt->dsi->dev;
-        struct device_node *np;
-        int ret;
 
         sharp_nt->mode = &default_mode;
 
@@ -271,39 +269,22 @@ static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
                 gpiod_set_value(sharp_nt->reset_gpio, 0);
         }
 
-        np = of_parse_phandle(dev->of_node, "backlight", 0);
-        if (np) {
-                sharp_nt->backlight = of_find_backlight_by_node(np);
-                of_node_put(np);
+        sharp_nt->backlight = devm_of_find_backlight(dev);
 
-                if (!sharp_nt->backlight)
-                        return -EPROBE_DEFER;
-        }
+        if (IS_ERR(sharp_nt->backlight))
+                return PTR_ERR(sharp_nt->backlight);
 
         drm_panel_init(&sharp_nt->base);
         sharp_nt->base.funcs = &sharp_nt_panel_funcs;
         sharp_nt->base.dev = &sharp_nt->dsi->dev;
 
-        ret = drm_panel_add(&sharp_nt->base);
-        if (ret < 0)
-                goto put_backlight;
-
-        return 0;
-
-put_backlight:
-        if (sharp_nt->backlight)
-                put_device(&sharp_nt->backlight->dev);
-
-        return ret;
+        return drm_panel_add(&sharp_nt->base);
 }
 
 static void sharp_nt_panel_del(struct sharp_nt_panel *sharp_nt)
 {
         if (sharp_nt->base.dev)
                 drm_panel_remove(&sharp_nt->base);
-
-        if (sharp_nt->backlight)
-                put_device(&sharp_nt->backlight->dev);
 }
 
 static int sharp_nt_panel_probe(struct mipi_dsi_device *dsi)