[media] rcar_vin: add devicetree support

Add support for devicetree probe for the rcar-vin
driver.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
[g.liakhovetski@gmx.de fix a typo, sort headers alphabetically]
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

2 files changed, 151 insertions, 7 deletions

diff --git a/Documentation/devicetree/bindings/media/rcar_vin.txt b/Documentation/devicetree/bindings/media/rcar_vin.txt
new file mode 100644
index 000000000000..ba61782c2af9
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/rcar_vin.txt
@@ -0,0 +1,86 @@
+Renesas RCar Video Input driver (rcar_vin)
+------------------------------------------
+
+The rcar_vin device provides video input capabilities for the Renesas R-Car
+family of devices. The current blocks are always slaves and suppot one input
+channel which can be either RGB, YUYV or BT656.
+
+ - compatible: Must be one of the following
+   - "renesas,vin-r8a7791" for the R8A7791 device
+   - "renesas,vin-r8a7790" for the R8A7790 device
+   - "renesas,vin-r8a7779" for the R8A7779 device
+   - "renesas,vin-r8a7778" for the R8A7778 device
+ - reg: the register base and size for the device registers
+ - interrupts: the interrupt for the device
+ - clocks: Reference to the parent clock
+
+Additionally, an alias named vinX will need to be created to specify
+which video input device this is.
+
+The per-board settings:
+ - port sub-node describing a single endpoint connected to the vin
+   as described in video-interfaces.txt[1]. Only the first one will
+   be considered as each vin interface has one input port.
+
+   These settings are used to work out video input format and widths
+   into the system.
+
+
+Device node example
+-------------------
+
+        aliases {
+               vin0 = &vin0;
+        };
+
+        vin0: vin@0xe6ef0000 {
+                compatible = "renesas,vin-r8a7790";
+                clocks = <&mstp8_clks R8A7790_CLK_VIN0>;
+                reg = <0 0xe6ef0000 0 0x1000>;
+                interrupts = <0 188 IRQ_TYPE_LEVEL_HIGH>;
+                status = "disabled";
+        };
+
+Board setup example (vin1 composite video input)
+------------------------------------------------
+
+&i2c2   {
+        status = "ok";
+        pinctrl-0 = <&i2c2_pins>;
+        pinctrl-names = "default";
+
+        adv7180@20 {
+                compatible = "adi,adv7180";
+                reg = <0x20>;
+                remote = <&vin1>;
+
+                port {
+                        adv7180: endpoint {
+                                bus-width = <8>;
+                                remote-endpoint = <&vin1ep0>;
+                        };
+                };
+        };
+};
+
+/* composite video input */
+&vin1 {
+        pinctrl-0 = <&vin1_pins>;
+        pinctrl-names = "default";
+
+        status = "ok";
+
+        port {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                vin1ep0: endpoint {
+                        remote-endpoint = <&adv7180>;
+                        bus-width = <8>;
+                };
+        };
+};
+
+
+
+[1] video-interfaces.txt common video media interface
diff --git a/drivers/media/platform/soc_camera/rcar_vin.c b/drivers/media/platform/soc_camera/rcar_vin.c
index 7c4299d9a100..85d579f65f52 100644
--- a/drivers/media/platform/soc_camera/rcar_vin.c
+++ b/drivers/media/platform/soc_camera/rcar_vin.c
@@ -19,6 +19,8 @@
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_data/camera-rcar.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
@@ -31,6 +33,7 @@
 #include <media/v4l2-dev.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-mediabus.h>
+#include <media/v4l2-of.h>
 #include <media/v4l2-subdev.h>
 #include <media/videobuf2-dma-contig.h>
 
@@ -1390,6 +1393,17 @@ static struct soc_camera_host_ops rcar_vin_host_ops = {
         .init_videobuf2 = rcar_vin_init_videobuf2,
 };
 
+#ifdef CONFIG_OF
+static struct of_device_id rcar_vin_of_table[] = {
+        { .compatible = "renesas,vin-r8a7791", .data = (void *)RCAR_GEN2 },
+        { .compatible = "renesas,vin-r8a7790", .data = (void *)RCAR_GEN2 },
+        { .compatible = "renesas,vin-r8a7779", .data = (void *)RCAR_H1 },
+        { .compatible = "renesas,vin-r8a7778", .data = (void *)RCAR_M1 },
+        { },
+};
+MODULE_DEVICE_TABLE(of, rcar_vin_of_table);
+#endif
+
 static struct platform_device_id rcar_vin_id_table[] = {
         { "r8a7791-vin",  RCAR_GEN2 },
         { "r8a7790-vin",  RCAR_GEN2 },
@@ -1402,15 +1416,52 @@ MODULE_DEVICE_TABLE(platform, rcar_vin_id_table);
 
 static int rcar_vin_probe(struct platform_device *pdev)
 {
+        const struct of_device_id *match = NULL;
         struct rcar_vin_priv *priv;
         struct resource *mem;
         struct rcar_vin_platform_data *pdata;
+        unsigned int pdata_flags;
         int irq, ret;
 
-        pdata = pdev->dev.platform_data;
-        if (!pdata || !pdata->flags) {
-                dev_err(&pdev->dev, "platform data not set\n");
-                return -EINVAL;
+        if (pdev->dev.of_node) {
+                struct v4l2_of_endpoint ep;
+                struct device_node *np;
+
+                match = of_match_device(of_match_ptr(rcar_vin_of_table),
+                                        &pdev->dev);
+
+                np = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
+                if (!np) {
+                        dev_err(&pdev->dev, "could not find endpoint\n");
+                        return -EINVAL;
+                }
+
+                ret = v4l2_of_parse_endpoint(np, &ep);
+                if (ret) {
+                        dev_err(&pdev->dev, "could not parse endpoint\n");
+                        return ret;
+                }
+
+                if (ep.bus_type == V4L2_MBUS_BT656)
+                        pdata_flags = RCAR_VIN_BT656;
+                else {
+                        pdata_flags = 0;
+                        if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
+                                pdata_flags |= RCAR_VIN_HSYNC_ACTIVE_LOW;
+                        if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
+                                pdata_flags |= RCAR_VIN_VSYNC_ACTIVE_LOW;
+                }
+
+                of_node_put(np);
+
+                dev_dbg(&pdev->dev, "pdata_flags = %08x\n", pdata_flags);
+        } else {
+                pdata = pdev->dev.platform_data;
+                if (!pdata || !pdata->flags) {
+                        dev_err(&pdev->dev, "platform data not set\n");
+                        return -EINVAL;
+                }
+                pdata_flags = pdata->flags;
         }
 
         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1441,12 +1492,18 @@ static int rcar_vin_probe(struct platform_device *pdev)
 
         priv->ici.priv = priv;
         priv->ici.v4l2_dev.dev = &pdev->dev;
-        priv->ici.nr = pdev->id;
         priv->ici.drv_name = dev_name(&pdev->dev);
         priv->ici.ops = &rcar_vin_host_ops;
 
-        priv->pdata_flags = pdata->flags;
-        priv->chip = pdev->id_entry->driver_data;
+        priv->pdata_flags = pdata_flags;
+        if (!match) {
+                priv->ici.nr = pdev->id;
+                priv->chip = pdev->id_entry->driver_data;
+        } else {
+                priv->ici.nr = of_alias_get_id(pdev->dev.of_node, "vin");
+                priv->chip = (enum chip_id)match->data;
+        };
+
         spin_lock_init(&priv->lock);
         INIT_LIST_HEAD(&priv->capture);
 
@@ -1487,6 +1544,7 @@ static struct platform_driver rcar_vin_driver = {
         .driver         = {
                 .name           = DRV_NAME,
                 .owner          = THIS_MODULE,
+                .of_match_table = of_match_ptr(rcar_vin_of_table),
         },
         .id_table       = rcar_vin_id_table,
 };