drivers/rtc/rtc-ds1742.c: add devicetree support

This patch allows the driver to be enabled with devicetree.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/devicetree/bindings/rtc/maxim,ds1742.txt b/Documentation/devicetree/bindings/rtc/maxim,ds1742.txt
new file mode 100644 (file)
index 0000000..d0f937c
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/maxim,ds1742.txt
@@ -0,0 +1,12 @@
+* Maxim (Dallas) DS1742/DS1743 Real Time Clock
+
+Required properties:
+- compatible: Should contain "maxim,ds1742".
+- reg: Physical base address of the RTC and length of memory
+  mapped region.
+
+Example:
+       rtc: rtc@10000000 {
+               compatible = "maxim,ds1742";
+               reg = <0x10000000 0x800>;
+       };

diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
index 17b73fd..d7f74f5 100644 (file)
--- a/drivers/rtc/rtc-ds1742.c
+++ b/drivers/rtc/rtc-ds1742.c
@@ -13,12 +13,13 @@
  */
 
 #include <linux/bcd.h>
-#include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/gfp.h>
 #include <linux/delay.h>
 #include <linux/jiffies.h>
 #include <linux/rtc.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/module.h>
@@ -215,12 +216,19 @@ static int ds1742_rtc_remove(struct platform_device *pdev)
        return 0;
 }
 
+static struct of_device_id __maybe_unused ds1742_rtc_of_match[] = {
+       { .compatible = "maxim,ds1742", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, ds1742_rtc_of_match);
+
 static struct platform_driver ds1742_rtc_driver = {
        .probe          = ds1742_rtc_probe,
        .remove         = ds1742_rtc_remove,
        .driver         = {
                .name   = "rtc-ds1742",
                .owner  = THIS_MODULE,
+               .of_match_table = of_match_ptr(ds1742_rtc_of_match),
        },
 };