[PATCH 1/3] drm/exynos: add device tree support for rotator

[Chanho Park]

The exynos4 platform is only dt-based since 3.10, we should convert driver data
and ids to dt-based parsing methods. The rotator driver has a limit table to get
size limit. The minimum size of RGB888 format is 8 x 8 and maximum size is 8K x
8K. The other format, YCbCr420 2-Plane has 32 x 32 min size and 32K x 32K max
size. Each format should be multiple of 'align' value.

Signed-off-by: Chanho Park <chanho61.park at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_rotator.c |  110 +++++++++++++++++++--------
 1 file changed, 80 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_rotator.c b/drivers/gpu/drm/exynos/exynos_drm_rotator.c
index 427640a..b353a10 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_rotator.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_rotator.c
@@ -96,7 +96,7 @@ struct rot_context {
 	struct resource	*regs_res;
 	void __iomem	*regs;
 	struct clk	*clock;
-	struct rot_limit_table	*limit_tbl;
+	struct rot_limit_table	limit_tbl;
 	int	irq;
 	int	cur_buf_id[EXYNOS_DRM_OPS_MAX];
 	bool	suspended;
@@ -167,7 +167,7 @@ static irqreturn_t rotator_irq_handler(int irq, void *arg)
 static void rotator_align_size(struct rot_context *rot, u32 fmt, u32 *hsize,
 		u32 *vsize)
 {
-	struct rot_limit_table *limit_tbl = rot->limit_tbl;
+	struct rot_limit_table *limit_tbl = &rot->limit_tbl;
 	struct rot_limit *limit;
 	u32 mask, val;
 
@@ -632,6 +632,72 @@ static int rotator_ippdrv_start(struct device *dev, enum drm_exynos_ipp_cmd cmd)
 	return 0;
 }
 
+static const struct of_device_id exynos_rotator_match[] = {
+	{
+		.compatible = "samsung,exynos4210-rotator",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, exynos_rotator_match);
+
+static int rotator_parse_dt_tbl(struct device_node *np, struct rot_limit *rlim)
+{
+	int ret;
+
+	ret = of_property_read_u32(np, "min_w", &rlim->min_w);
+	if (ret)
+		return ret;
+
+	ret = of_property_read_u32(np, "min_h", &rlim->min_h);
+	if (ret)
+		return ret;
+
+	ret = of_property_read_u32(np, "max_w", &rlim->max_w);
+	if (ret)
+		return ret;
+
+	ret = of_property_read_u32(np, "max_h", &rlim->max_h);
+	if (ret)
+		return ret;
+
+	ret = of_property_read_u32(np, "align", &rlim->align);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int rotator_parse_dt(struct device *dev, struct rot_context *rot)
+{
+	struct device_node *ycbcr_node, *rgb888_node;
+	int ret;
+
+	ycbcr_node = of_get_child_by_name(dev->of_node, "ycbcr420_2p");
+	if (!ycbcr_node) {
+		dev_err(dev, "can't find ycbcr420_2p node\n");
+		return -ENODEV;
+	}
+
+	rgb888_node = of_get_child_by_name(dev->of_node, "rgb888");
+	if (!rgb888_node) {
+		dev_err(dev, "can't find rgb888 node\n");
+		return -ENODEV;
+	}
+
+	ret = rotator_parse_dt_tbl(ycbcr_node, &rot->limit_tbl.ycbcr420_2p);
+	if (ret) {
+		dev_err(dev, "failed to parse ycbcr420 data\n");
+		return ret;
+	}
+	ret = rotator_parse_dt_tbl(rgb888_node, &rot->limit_tbl.rgb888);
+	if (ret) {
+		dev_err(dev, "failed to parse rgb888 data\n");
+		return ret;
+	}
+
+	return 0;
+}
+
 static int rotator_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -639,14 +705,23 @@ static int rotator_probe(struct platform_device *pdev)
 	struct exynos_drm_ippdrv *ippdrv;
 	int ret;
 
+	if (!dev->of_node) {
+		dev_err(dev, "Cannot find device tree node\n");
+		return -ENODEV;
+	}
+
 	rot = devm_kzalloc(dev, sizeof(*rot), GFP_KERNEL);
 	if (!rot) {
 		dev_err(dev, "failed to allocate rot\n");
 		return -ENOMEM;
 	}
 
-	rot->limit_tbl = (struct rot_limit_table *)
-				platform_get_device_id(pdev)->driver_data;
+	ret = rotator_parse_dt(dev, rot);
+	if (ret) {
+		dev_err(dev, "failed parse dt info\n");
+		devm_kfree(dev, rot);
+		return ret;
+	}
 
 	rot->regs_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	rot->regs = devm_ioremap_resource(dev, rot->regs_res);
@@ -718,31 +793,6 @@ static int rotator_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static struct rot_limit_table rot_limit_tbl = {
-	.ycbcr420_2p = {
-		.min_w = 32,
-		.min_h = 32,
-		.max_w = SZ_32K,
-		.max_h = SZ_32K,
-		.align = 3,
-	},
-	.rgb888 = {
-		.min_w = 8,
-		.min_h = 8,
-		.max_w = SZ_8K,
-		.max_h = SZ_8K,
-		.align = 2,
-	},
-};
-
-static struct platform_device_id rotator_driver_ids[] = {
-	{
-		.name		= "exynos-rot",
-		.driver_data	= (unsigned long)&rot_limit_tbl,
-	},
-	{},
-};
-
 static int rotator_clk_crtl(struct rot_context *rot, bool enable)
 {
 	if (enable) {
@@ -804,10 +854,10 @@ static const struct dev_pm_ops rotator_pm_ops = {
 struct platform_driver rotator_driver = {
 	.probe		= rotator_probe,
 	.remove		= rotator_remove,
-	.id_table	= rotator_driver_ids,
 	.driver		= {
 		.name	= "exynos-rot",
 		.owner	= THIS_MODULE,
 		.pm	= &rotator_pm_ops,
+		.of_match_table = of_match_ptr(exynos_rotator_match),
 	},
 };
-- 
1.7.9.5