[PATCH v7 1/2] video: drm: exynos: Add display-timing node parsing using video helper function

[Vikas Sajjan]

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

The DT node parsing and pinctrl selection 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 at samsung.com>
Signed-off-by: Vikas Sajjan <vikas.sajjan at linaro.org>
---
 drivers/gpu/drm/exynos/exynos_drm_fimd.c |   27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 9537761..f80cf68 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>
 
@@ -877,16 +878,34 @@ static int fimd_probe(struct platform_device *pdev)
 	struct exynos_drm_subdrv *subdrv;
 	struct exynos_drm_fimd_pdata *pdata;
 	struct exynos_drm_panel_info *panel;
+	struct fb_videomode *fbmode;
 	struct resource *res;
 	int win;
 	int ret = -EINVAL;
 
 	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;
+		}
+
+		fbmode = &pdata->panel.timing;
+		ret = of_get_fb_videomode(dev->of_node, fbmode,
+					OF_USE_NATIVE_MODE);
+		if (ret) {
+			DRM_ERROR("failed: of_get_fb_videomode()\n"
+				"with return value: %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;
-- 
1.7.9.5