From: Seung-Woo Kim <sw0312.kim@samsung.com>
Date: Tue, 6 Jan 2015 08:19:04 +0000 (+0900)
Subject: exynos-gsc: add devicetree binding optional flag for lcd-wb
X-Git-Tag: submit/tizen/20150416.081342~26
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=751cd6d88d9620c83042641b52fdd244408a3947;p=platform%2Fkernel%2Flinux-exynos.git

exynos-gsc: add devicetree binding optional flag for lcd-wb

This patch adds optional flag for lcd-wb of gsc. If the flag is set,
then the gsc hw is controlled by drm driver.

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
---

diff --git a/Documentation/devicetree/bindings/media/exynos5-gsc.txt b/Documentation/devicetree/bindings/media/exynos5-gsc.txt
index 0604d42f38d1..d526777a3abd 100644
--- a/Documentation/devicetree/bindings/media/exynos5-gsc.txt
+++ b/Documentation/devicetree/bindings/media/exynos5-gsc.txt
@@ -7,6 +7,10 @@ Required properties:
 - reg: should contain G-Scaler physical address location and length.
 - interrupts: should contain G-Scaler interrupt number
 
+Optional properties:
+- samsung,lcd-wb: this property must be present if the IP block has the LCD
+  writeback input.
+
 Example:
 
 gsc_0:  gsc@0x13e00000 {
diff --git a/drivers/media/platform/exynos-gsc/gsc-core.c b/drivers/media/platform/exynos-gsc/gsc-core.c
index fd2891c886a3..2edc40bc5547 100644
--- a/drivers/media/platform/exynos-gsc/gsc-core.c
+++ b/drivers/media/platform/exynos-gsc/gsc-core.c
@@ -1084,9 +1084,11 @@ static int gsc_probe(struct platform_device *pdev)
 	if (!gsc)
 		return -ENOMEM;
 
-	if (dev->of_node)
+	if (dev->of_node) {
 		gsc->id = of_alias_get_id(pdev->dev.of_node, "gsc");
-	else
+		if (of_property_read_bool(dev->of_node, "samsung,lcd-wb"))
+			return -ENODEV;
+	} else
 		gsc->id = pdev->id;
 
 	if (gsc->id >= drv_data->num_entities) {