am1808 rtc issue in kernel 3.17

Dear all,

i am facing a strange issue on am1808 based board, very similar to da850-evm:

omap-rtc is not more shown as running.

Strangely, if i add this lines, as them was there in kernel 3.5.1, it starts to run:

diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-davinci/devices-da8xx.c
index 7d91728..cf60c07 100644
--- a/arch/arm/mach-davinci/devices-da8xx.c
+++ b/arch/arm/mach-davinci/devices-da8xx.c
@@ -848,6 +848,19 @@ static struct platform_device da8xx_rtc_device = {
 
 int da8xx_register_rtc(void)
 {
+       int ret;
+       void __iomem *base;
+
+       base = ioremap(DA8XX_RTC_BASE, SZ_4K);
+       if (WARN_ON(!base))
+               return -ENOMEM;
+
+       /* Unlock the rtc's registers */
+       __raw_writel(0x83e70b13, base + 0x6c);
+       __raw_writel(0x95a4f1e0, base + 0x70);
+
+       iounmap(base);
+
        return platform_device_register(&da8xx_rtc_device);
 }

Could someone confirm this is a good fix ? Or what i am missing ? Thanks

angelo