am335x: Enable RTC 32K OSC clock

In order to support low power state, you must source kernel system
timers to persistent clock, available across suspend/resume.  In case of
AM335x device, the only source we have is, RTC32K, available in
wakeup/always-on domain.  Having said that, during validation it has
been observed that, RTC clock need couple of seconds delay to stabilize
the RTC OSC clock; and such a huge delay is not acceptable in kernel
especially during early init and also it will impact quick/fast boot
use-cases.

So, RTC32k OSC enable dependency has been shifted to
SPL/first-bootloader.

Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-am33xx/cpu.h b/arch/arm/include/asm/arch-am33xx/cpu.h
index 6cfbef76a7..819fd2f026 100644
--- a/arch/arm/include/asm/arch-am33xx/cpu.h
+++ b/arch/arm/include/asm/arch-am33xx/cpu.h
@@ -169,6 +169,12 @@ struct cm_dpll {
 	unsigned int clktimer2clk;	/* offset 0x08 */
 };
 
+/* Control Module RTC registers */
+struct cm_rtc {
+	unsigned int rtcclkctrl;	/* offset 0x0 */
+	unsigned int clkstctrl;		/* offset 0x4 */
+};
+
 /* Watchdog timer registers */
 struct wd_timer {
 	unsigned int resv1[4];
@@ -218,6 +224,15 @@ struct gptimer {
 	unsigned int tcar2;		/* offset 0x58 */
 };
 
+/* RTC Registers */
+struct rtc_regs {
+	unsigned int res[21];
+	unsigned int osc;		/* offset 0x54 */
+	unsigned int res2[5];
+	unsigned int kick0r;		/* offset 0x6c */
+	unsigned int kick1r;		/* offset 0x70 */
+};
+
 /* UART Registers */
 struct uart_sys {
 	unsigned int resv1[21];