[media] media: atmel-isi: add primary DT support

This patch add the DT support for Atmel ISI driver.
It use the same v4l2 DT interface that defined in video-interfaces.txt.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Cc: devicetree@vger.kernel.org
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

2 files changed, 114 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/media/atmel-isi.txt b/Documentation/devicetree/bindings/media/atmel-isi.txt
new file mode 100644
index 000000000000..17e71b7b44c6
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/atmel-isi.txt
@@ -0,0 +1,51 @@
+Atmel Image Sensor Interface (ISI) SoC Camera Subsystem
+----------------------------------------------
+
+Required properties:
+- compatible: must be "atmel,at91sam9g45-isi"
+- reg: physical base address and length of the registers set for the device;
+- interrupts: should contain IRQ line for the ISI;
+- clocks: list of clock specifiers, corresponding to entries in
+          the clock-names property;
+- clock-names: must contain "isi_clk", which is the isi peripherial clock.
+
+ISI supports a single port node with parallel bus. It should contain one
+'port' child node with child 'endpoint' node. Please refer to the bindings
+defined in Documentation/devicetree/bindings/media/video-interfaces.txt.
+
+Example:
+        isi: isi@f0034000 {
+                compatible = "atmel,at91sam9g45-isi";
+                reg = <0xf0034000 0x4000>;
+                interrupts = <37 IRQ_TYPE_LEVEL_HIGH 5>;
+
+                clocks = <&isi_clk>;
+                clock-names = "isi_clk";
+
+                pinctrl-names = "default";
+                pinctrl-0 = <&pinctrl_isi>;
+
+                port {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+
+                        isi_0: endpoint {
+                                remote-endpoint = <&ov2640_0>;
+                                bus-width = <8>;
+                        };
+                };
+        };
+
+        i2c1: i2c@f0018000 {
+                ov2640: camera@0x30 {
+                        compatible = "omnivision,ov2640";
+                        reg = <0x30>;
+
+                        port {
+                                ov2640_0: endpoint {
+                                        remote-endpoint = <&isi_0>;
+                                        bus-width = <8>;
+                                };
+                        };
+                };
+        };
diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c
index d32c53383565..3408b045b3f1 100644
--- a/drivers/media/platform/soc_camera/atmel-isi.c
+++ b/drivers/media/platform/soc_camera/atmel-isi.c
@@ -25,6 +25,7 @@
 #include <media/atmel-isi.h>
 #include <media/soc_camera.h>
 #include <media/soc_mediabus.h>
+#include <media/v4l2-of.h>
 #include <media/videobuf2-dma-contig.h>
 
 #define MAX_BUFFER_NUM                  32
@@ -33,6 +34,7 @@
 #define VID_LIMIT_BYTES                 (16 * 1024 * 1024)
 #define MIN_FRAME_RATE                  15
 #define FRAME_INTERVAL_MILLI_SEC        (1000 / MIN_FRAME_RATE)
+#define ISI_DEFAULT_MCLK_FREQ           25000000
 
 /* Frame buffer descriptor */
 struct fbd {
@@ -876,6 +878,51 @@ static int atmel_isi_remove(struct platform_device *pdev)
         return 0;
 }
 
+static int atmel_isi_probe_dt(struct atmel_isi *isi,
+                        struct platform_device *pdev)
+{
+        struct device_node *np= pdev->dev.of_node;
+        struct v4l2_of_endpoint ep;
+        int err;
+
+        /* Default settings for ISI */
+        isi->pdata.full_mode = 1;
+        isi->pdata.mck_hz = ISI_DEFAULT_MCLK_FREQ;
+        isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
+
+        np = of_graph_get_next_endpoint(np, NULL);
+        if (!np) {
+                dev_err(&pdev->dev, "Could not find the endpoint\n");
+                return -EINVAL;
+        }
+
+        err = v4l2_of_parse_endpoint(np, &ep);
+        if (err) {
+                dev_err(&pdev->dev, "Could not parse the endpoint\n");
+                goto err_probe_dt;
+        }
+
+        switch (ep.bus.parallel.bus_width) {
+        case 8:
+                isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
+                break;
+        case 10:
+                isi->pdata.data_width_flags =
+                                ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
+                break;
+        default:
+                dev_err(&pdev->dev, "Unsupported bus width: %d\n",
+                                ep.bus.parallel.bus_width);
+                err = -EINVAL;
+                goto err_probe_dt;
+        }
+
+err_probe_dt:
+        of_node_put(np);
+
+        return err;
+}
+
 static int atmel_isi_probe(struct platform_device *pdev)
 {
         unsigned int irq;
@@ -887,7 +934,7 @@ static int atmel_isi_probe(struct platform_device *pdev)
         struct isi_platform_data *pdata;
 
         pdata = dev->platform_data;
-        if (!pdata || !pdata->data_width_flags) {
+        if ((!pdata || !pdata->data_width_flags) && !pdev->dev.of_node) {
                 dev_err(&pdev->dev,
                         "No config available for Atmel ISI\n");
                 return -EINVAL;
@@ -903,7 +950,14 @@ static int atmel_isi_probe(struct platform_device *pdev)
         if (IS_ERR(isi->pclk))
                 return PTR_ERR(isi->pclk);
 
-        memcpy(&isi->pdata, pdata, sizeof(isi->pdata));
+        if (pdata) {
+                memcpy(&isi->pdata, pdata, sizeof(isi->pdata));
+        } else {
+                ret = atmel_isi_probe_dt(isi, pdev);
+                if (ret)
+                        return ret;
+        }
+
         isi->active = NULL;
         spin_lock_init(&isi->lock);
         INIT_LIST_HEAD(&isi->video_buffer_list);
@@ -1005,11 +1059,18 @@ err_alloc_ctx:
         return ret;
 }
 
+static const struct of_device_id atmel_isi_of_match[] = {
+        { .compatible = "atmel,at91sam9g45-isi" },
+        { }
+};
+MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
+
 static struct platform_driver atmel_isi_driver = {
         .remove         = atmel_isi_remove,
         .driver         = {
                 .name = "atmel_isi",
                 .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(atmel_isi_of_match),
         },
 };