rtc: mxc: add support of device tree

Add device tree support for the mxc rtc driver.

Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Philippe Reynes <tremyfr@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c
index 880d485d5cc1..7bd89d90048f 100644
--- a/drivers/rtc/rtc-mxc.c
+++ b/drivers/rtc/rtc-mxc.c
@@ -16,6 +16,8 @@
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #define RTC_INPUT_CLK_32768HZ   (0x00 << 5)
 #define RTC_INPUT_CLK_32000HZ   (0x01 << 5)
@@ -98,6 +100,15 @@ static const struct platform_device_id imx_rtc_devtype[] = {
 };
 MODULE_DEVICE_TABLE(platform, imx_rtc_devtype);
 
+#ifdef CONFIG_OF
+static const struct of_device_id imx_rtc_dt_ids[] = {
+        { .compatible = "fsl,imx1-rtc", .data = (const void *)IMX1_RTC },
+        { .compatible = "fsl,imx21-rtc", .data = (const void *)IMX21_RTC },
+        {}
+};
+MODULE_DEVICE_TABLE(of, imx_rtc_dt_ids);
+#endif
+
 static inline int is_imx1_rtc(struct rtc_plat_data *data)
 {
         return data->devtype == IMX1_RTC;
@@ -362,12 +373,17 @@ static int mxc_rtc_probe(struct platform_device *pdev)
         u32 reg;
         unsigned long rate;
         int ret;
+        const struct of_device_id *of_id;
 
         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
         if (!pdata)
                 return -ENOMEM;
 
-        pdata->devtype = pdev->id_entry->driver_data;
+        of_id = of_match_device(imx_rtc_dt_ids, &pdev->dev);
+        if (of_id)
+                pdata->devtype = (enum imx_rtc_type)of_id->data;
+        else
+                pdata->devtype = pdev->id_entry->driver_data;
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
@@ -488,6 +504,7 @@ static SIMPLE_DEV_PM_OPS(mxc_rtc_pm_ops, mxc_rtc_suspend, mxc_rtc_resume);
 static struct platform_driver mxc_rtc_driver = {
         .driver = {
                    .name        = "mxc_rtc",
+                   .of_match_table = of_match_ptr(imx_rtc_dt_ids),
                    .pm          = &mxc_rtc_pm_ops,
         },
         .id_table = imx_rtc_devtype,