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From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: <linux-omap@vger.kernel.org>, <linux-fbdev@vger.kernel.org>,
	<devicetree@vger.kernel.org>
CC: Archit Taneja <archit@ti.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Nishanth Menon <nm@ti.com>, Felipe Balbi <balbi@ti.com>,
	Santosh Shilimkar <santosh.shilimkar@ti.com>,
	Tony Lindgren <tony@atomide.com>, Tomi Valkeinen <tomi.valkeinen@ti.com>
Subject: [RFC 16/22] OMAPDSS: panel-dsi-cm: Add DT support
Date: Fri, 9 Aug 2013 11:39:01 +0300
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XXX ULPS and backlight missing.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/video/omap2/displays-new/panel-dsi-cm.c | 87 +++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/drivers/video/omap2/displays-new/panel-dsi-cm.c b/drivers/video/omap2/displays-new/panel-dsi-cm.c
index aaaea64..f65ea4d 100644
--- a/drivers/video/omap2/displays-new/panel-dsi-cm.c
+++ b/drivers/video/omap2/displays-new/panel-dsi-cm.c
@@ -22,6 +22,8 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
 
 #include <video/omapdss.h>
 #include <video/omap-panel-data.h>
@@ -1156,6 +1158,79 @@ static int dsicm_probe_pdata(struct platform_device *pdev)
 	return 0;
 }
 
+static int dsicm_probe_of(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+	struct omap_dss_device *in;
+	struct property *prop;
+	struct device_node *src_node;
+	u32 lane_arr[10];
+	int gpio, len, num_pins;
+	int r, i;
+
+	src_node = of_parse_phandle(node, "video-source", 0);
+	if (!src_node) {
+		dev_err(&pdev->dev, "failed to parse video source\n");
+		return -ENODEV;
+	}
+
+	in = omap_dss_find_output_by_node(src_node);
+	if (in == NULL) {
+		dev_err(&pdev->dev, "failed to find video source\n");
+		return -EPROBE_DEFER;
+	}
+	ddata->in = in;
+
+	gpio = of_get_gpio(node, 0);
+	if (!gpio_is_valid(gpio)) {
+		dev_err(&pdev->dev, "failed to parse reset gpio\n");
+		return gpio;
+	}
+	ddata->reset_gpio = gpio;
+
+	if (of_gpio_count(node) > 1) {
+		gpio = of_get_gpio(node, 1);
+
+		if (gpio_is_valid(gpio) || gpio == -ENOENT) {
+			ddata->ext_te_gpio = gpio;
+		} else {
+			dev_err(&pdev->dev, "failed to parse TE gpio\n");
+			return gpio;
+		}
+	} else {
+		ddata->ext_te_gpio = -1;
+	}
+
+	prop = of_find_property(node, "lanes", &len);
+	if (prop == NULL) {
+		dev_err(&pdev->dev, "failed to find lane data\n");
+		return -EINVAL;
+	}
+
+	num_pins = len / sizeof(u32);
+
+	if (num_pins < 4 || num_pins % 2 != 0
+			|| num_pins > ARRAY_SIZE(lane_arr)) {
+		dev_err(&pdev->dev, "bad number of lanes\n");
+		return -EINVAL;
+	}
+
+	r = of_property_read_u32_array(node, "lanes", lane_arr, num_pins);
+	if (r) {
+		dev_err(&pdev->dev, "failed to read lane data\n");
+		return r;
+	}
+
+	ddata->pin_config.num_pins = num_pins;
+	for (i = 0; i < num_pins; ++i)
+		ddata->pin_config.pins[i] = (int)lane_arr[i];
+
+	/* TODO: ulps, backlight */
+
+	return 0;
+}
+
 static int dsicm_probe(struct platform_device *pdev)
 {
 	struct backlight_properties props;
@@ -1178,6 +1253,10 @@ static int dsicm_probe(struct platform_device *pdev)
 		r = dsicm_probe_pdata(pdev);
 		if (r)
 			return r;
+	} else if (pdev->dev.of_node) {
+		r = dsicm_probe_of(pdev);
+		if (r)
+			return r;
 	} else {
 		return -ENODEV;
 	}
@@ -1320,12 +1399,20 @@ static int __exit dsicm_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id dsicm_of_match[] = {
+	{ .compatible = "panel-dsi-cm", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, dsicm_of_match);
+
 static struct platform_driver dsicm_driver = {
 	.probe = dsicm_probe,
 	.remove = __exit_p(dsicm_remove),
 	.driver = {
 		.name = "panel-dsi-cm",
 		.owner = THIS_MODULE,
+		.of_match_table = dsicm_of_match,
 	},
 };