video: mxsfb: add simple device tree probe

Add a simple device tree probe support for mxsfb driver.  Before
a common binding for struct fb_videomode is available, the driver will
keep using struct mxsfb_platform_data.  That said, platform code will
use auxdata to attach mxsfb_platform_data for device tree boot.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

1 files changed, 47 insertions, 13 deletions

diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c
index 08dad8d8abba..49619b441500 100644
--- a/drivers/video/mxsfb.c
+++ b/drivers/video/mxsfb.c
@@ -41,6 +41,8 @@
 
 #include <linux/module.h>
 #include <linux/kernel.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
@@ -750,16 +752,43 @@ static void __devexit mxsfb_free_videomem(struct mxsfb_info *host)
         }
 }
 
+static struct platform_device_id mxsfb_devtype[] = {
+        {
+                .name = "imx23-fb",
+                .driver_data = MXSFB_V3,
+        }, {
+                .name = "imx28-fb",
+                .driver_data = MXSFB_V4,
+        }, {
+                /* sentinel */
+        }
+};
+MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
+
+static const struct of_device_id mxsfb_dt_ids[] = {
+        { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
+        { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
+
 static int __devinit mxsfb_probe(struct platform_device *pdev)
 {
+        const struct of_device_id *of_id =
+                        of_match_device(mxsfb_dt_ids, &pdev->dev);
         struct mxsfb_platform_data *pdata = pdev->dev.platform_data;
         struct resource *res;
         struct mxsfb_info *host;
         struct fb_info *fb_info;
         struct fb_modelist *modelist;
         struct pinctrl *pinctrl;
+        int panel_enable;
+        enum of_gpio_flags flags;
         int i, ret;
 
+        if (of_id)
+                pdev->id_entry = of_id->data;
+
         if (!pdata) {
                 dev_err(&pdev->dev, "No platformdata. Giving up\n");
                 return -ENODEV;
@@ -807,6 +836,22 @@ static int __devinit mxsfb_probe(struct platform_device *pdev)
                 goto error_getclock;
         }
 
+        panel_enable = of_get_named_gpio_flags(pdev->dev.of_node,
+                                               "panel-enable-gpios", 0, &flags);
+        if (gpio_is_valid(panel_enable)) {
+                unsigned long f = GPIOF_OUT_INIT_HIGH;
+                if (flags == OF_GPIO_ACTIVE_LOW)
+                        f = GPIOF_OUT_INIT_LOW;
+                ret = devm_gpio_request_one(&pdev->dev, panel_enable,
+                                            f, "panel-enable");
+                if (ret) {
+                        dev_err(&pdev->dev,
+                                "failed to request gpio %d: %d\n",
+                                panel_enable, ret);
+                        goto error_panel_enable;
+                }
+        }
+
         fb_info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
         if (!fb_info->pseudo_palette) {
                 ret = -ENOMEM;
@@ -854,6 +899,7 @@ error_register:
 error_init_fb:
         kfree(fb_info->pseudo_palette);
 error_pseudo_pallette:
+error_panel_enable:
         clk_put(host->clk);
 error_getclock:
 error_getpin:
@@ -901,19 +947,6 @@ static void mxsfb_shutdown(struct platform_device *pdev)
         writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR);
 }
 
-static struct platform_device_id mxsfb_devtype[] = {
-        {
-                .name = "imx23-fb",
-                .driver_data = MXSFB_V3,
-        }, {
-                .name = "imx28-fb",
-                .driver_data = MXSFB_V4,
-        }, {
-                /* sentinel */
-        }
-};
-MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
-
 static struct platform_driver mxsfb_driver = {
         .probe = mxsfb_probe,
         .remove = __devexit_p(mxsfb_remove),
@@ -921,6 +954,7 @@ static struct platform_driver mxsfb_driver = {
         .id_table = mxsfb_devtype,
         .driver = {
                    .name = DRIVER_NAME,
+                   .of_match_table = mxsfb_dt_ids,
         },
 };