drm/exynos: add device tree support for rotator

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 of input picture. Each SoCs has slightly different limit value
compared with any others.
For example, exynos4210's max_size of RGB888 is 16k x 16k. But, others have
8k x 8k. Another example the exynos5250 should have multiple of 2 pixel size
for its X/Y axis. Thus, we should keep different tables for each of them.
This patch also includes desciptions of each nodes for the rotator and specifies
a example how to bind it.

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

2 files changed, 107 insertions, 28 deletions

diff --git a/Documentation/devicetree/bindings/gpu/samsung-rotator.txt b/Documentation/devicetree/bindings/gpu/samsung-rotator.txt
new file mode 100644
index 000000000000..82cd1ed0be93
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpu/samsung-rotator.txt
@@ -0,0 +1,27 @@
+* Samsung Image Rotator
+
+Required properties:
+  - compatible : value should be one of the following:
+        (a) "samsung,exynos4210-rotator" for Rotator IP in Exynos4210
+        (b) "samsung,exynos4212-rotator" for Rotator IP in Exynos4212/4412
+        (c) "samsung,exynos5250-rotator" for Rotator IP in Exynos5250
+
+  - reg : Physical base address of the IP registers and length of memory
+          mapped region.
+
+  - interrupts : Interrupt specifier for rotator interrupt, according to format
+                 specific to interrupt parent.
+
+  - clocks : Clock specifier for rotator clock, according to generic clock
+             bindings. (See Documentation/devicetree/bindings/clock/exynos*.txt)
+
+  - clock-names : Names of clocks. For exynos rotator, it should be "rotator".
+
+Example:
+        rotator@12810000 {
+                compatible = "samsung,exynos4210-rotator";
+                reg = <0x12810000 0x1000>;
+                interrupts = <0 83 0>;
+                clocks = <&clock 278>;
+                clock-names = "rotator";
+        };
diff --git a/drivers/gpu/drm/exynos/exynos_drm_rotator.c b/drivers/gpu/drm/exynos/exynos_drm_rotator.c
index 54b7360bad30..a77cd5bb104c 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_rotator.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_rotator.c
@@ -632,21 +632,98 @@ static int rotator_ippdrv_start(struct device *dev, enum drm_exynos_ipp_cmd cmd)
         return 0;
 }
 
+static struct rot_limit_table rot_limit_tbl_4210 = {
+        .ycbcr420_2p = {
+                .min_w = 32,
+                .min_h = 32,
+                .max_w = SZ_64K,
+                .max_h = SZ_64K,
+                .align = 3,
+        },
+        .rgb888 = {
+                .min_w = 8,
+                .min_h = 8,
+                .max_w = SZ_16K,
+                .max_h = SZ_16K,
+                .align = 2,
+        },
+};
+
+static struct rot_limit_table rot_limit_tbl_4x12 = {
+        .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 rot_limit_table rot_limit_tbl_5250 = {
+        .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 = 1,
+        },
+};
+
+static const struct of_device_id exynos_rotator_match[] = {
+        {
+                .compatible = "samsung,exynos4210-rotator",
+                .data = &rot_limit_tbl_4210,
+        },
+        {
+                .compatible = "samsung,exynos4212-rotator",
+                .data = &rot_limit_tbl_4x12,
+        },
+        {
+                .compatible = "samsung,exynos5250-rotator",
+                .data = &rot_limit_tbl_5250,
+        },
+        {},
+};
+
 static int rotator_probe(struct platform_device *pdev)
 {
         struct device *dev = &pdev->dev;
         struct rot_context *rot;
         struct exynos_drm_ippdrv *ippdrv;
+        const struct of_device_id *match;
         int ret;
 
+        if (!dev->of_node) {
+                dev_err(dev, "cannot find of_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;
+        match = of_match_node(exynos_rotator_match, dev->of_node);
+        if (!match) {
+                dev_err(dev, "failed to match node\n");
+                return -ENODEV;
+        }
+        rot->limit_tbl = (struct rot_limit_table *)match->data;
 
         rot->regs_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         rot->regs = devm_ioremap_resource(dev, rot->regs_res);
@@ -718,31 +795,6 @@ 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 +856,10 @@ 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 = exynos_rotator_match,
         },
 };