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>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 98cc147..ebb77e4 100644 (file)
--- 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;