OMAPDSS: panel-dpi: Add DT support

Add DT support for panel-dpi.

We disable the use of the backlight_gpio as it should be handled via
backlight framework with DT boots.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Archit Taneja <archit@ti.com>

diff --git a/drivers/video/fbdev/omap2/displays-new/panel-dpi.c b/drivers/video/fbdev/omap2/displays-new/panel-dpi.c
index d379dec..dca6b10 100644 (file)
--- a/drivers/video/fbdev/omap2/displays-new/panel-dpi.c
+++ b/drivers/video/fbdev/omap2/displays-new/panel-dpi.c
@@ -13,9 +13,12 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 
 #include <video/omapdss.h>
 #include <video/omap-panel-data.h>
+#include <video/of_display_timing.h>
 
 struct panel_drv_data {
        struct omap_dss_device dssdev;
@@ -72,7 +75,8 @@ static int panel_dpi_enable(struct omap_dss_device *dssdev)
        if (omapdss_device_is_enabled(dssdev))
                return 0;
 
-       in->ops.dpi->set_data_lines(in, ddata->data_lines);
+       if (ddata->data_lines)
+               in->ops.dpi->set_data_lines(in, ddata->data_lines);
        in->ops.dpi->set_timings(in, &ddata->videomode);
 
        r = in->ops.dpi->enable(in);
@@ -195,6 +199,47 @@ err_gpio:
        return r;
 }
 
+static int panel_dpi_probe_of(struct platform_device *pdev)
+{
+       struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+       struct device_node *node = pdev->dev.of_node;
+       struct omap_dss_device *in;
+       int r;
+       struct display_timing timing;
+       struct videomode vm;
+       struct gpio_desc *gpio;
+
+       gpio = devm_gpiod_get(&pdev->dev, "enable");
+       if (IS_ERR(gpio)) {
+               dev_err(&pdev->dev, "failed to parse enable gpio\n");
+               return PTR_ERR(gpio);
+       } else {
+               gpiod_direction_output(gpio, 0);
+               ddata->enable_gpio = gpio;
+       }
+
+       ddata->backlight_gpio = -ENOENT;
+
+       r = of_get_display_timing(node, "panel-timing", &timing);
+       if (r) {
+               dev_err(&pdev->dev, "failed to get video timing\n");
+               return r;
+       }
+
+       videomode_from_timing(&timing, &vm);
+       videomode_to_omap_video_timings(&vm, &ddata->videomode);
+
+       in = omapdss_of_find_source_for_first_ep(node);
+       if (IS_ERR(in)) {
+               dev_err(&pdev->dev, "failed to find video source\n");
+               return PTR_ERR(in);
+       }
+
+       ddata->in = in;
+
+       return 0;
+}
+
 static int panel_dpi_probe(struct platform_device *pdev)
 {
        struct panel_drv_data *ddata;
@@ -211,6 +256,10 @@ static int panel_dpi_probe(struct platform_device *pdev)
                r = panel_dpi_probe_pdata(pdev);
                if (r)
                        return r;
+       } else if (pdev->dev.of_node) {
+               r = panel_dpi_probe_of(pdev);
+               if (r)
+                       return r;
        } else {
                return -ENODEV;
        }
@@ -260,12 +309,20 @@ static int __exit panel_dpi_remove(struct platform_device *pdev)
        return 0;
 }
 
+static const struct of_device_id panel_dpi_of_match[] = {
+       { .compatible = "omapdss,panel-dpi", },
+       {},
+};
+
+MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
+
 static struct platform_driver panel_dpi_driver = {
        .probe = panel_dpi_probe,
        .remove = __exit_p(panel_dpi_remove),
        .driver = {
                .name = "panel-dpi",
                .owner = THIS_MODULE,
+               .of_match_table = panel_dpi_of_match,
        },
 };