drm/exynos: Add display-timing node parsing using video helper function

Add support for parsing the display-timing node using video helper
function.

The DT node parsing is done only if 'dev.of_node'
exists and the NON-DT logic is still maintained under the 'else' part.

Signed-off-by: Leela Krishna Amudala <l.krishna@samsung.com>
Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org>
Acked-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 20 insertions, 4 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 98cc14725ba9..ebb77e46fb19 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -20,6 +20,7 @@
 #include <linux/of_device.h>
 #include <linux/pm_runtime.h>
 
+#include <video/of_display_timing.h>
 #include <video/samsung_fimd.h>
 #include <drm/exynos_drm.h>
 
@@ -884,10 +885,25 @@ static int fimd_probe(struct platform_device *pdev)
 
         DRM_DEBUG_KMS("%s\n", __FILE__);
 
-        pdata = pdev->dev.platform_data;
-        if (!pdata) {
-                dev_err(dev, "no platform data specified\n");
-                return -EINVAL;
+        if (pdev->dev.of_node) {
+                pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+                if (!pdata) {
+                        DRM_ERROR("memory allocation for pdata failed\n");
+                        return -ENOMEM;
+                }
+
+                ret = of_get_fb_videomode(dev->of_node, &pdata->panel.timing,
+                                        OF_USE_NATIVE_MODE);
+                if (ret) {
+                        DRM_ERROR("failed: of_get_fb_videomode() : %d\n", ret);
+                        return ret;
+                }
+        } else {
+                pdata = pdev->dev.platform_data;
+                if (!pdata) {
+                        DRM_ERROR("no platform data specified\n");
+                        return -EINVAL;
+                }
         }
 
         panel = &pdata->panel;