[PATCH v2 01/20] rtc: omap: fix clock-source configuration

Johan Hovold
2014-10-21T17:37:47Z

Make sure not to reset the clock-source configuration when enabling the
32kHz clock mux.

Until the clock source can be configured through device tree we must not
overwrite settings made by the bootloader (e.g. clock-source selection).

Fixes: cd914bba03d8 ("drivers/rtc/rtc-omap.c: add support for enabling
32khz clock")
Cc: stable <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Reviewed-by: Felipe Balbi <balbi-l0cyMroinI0@public.gmane.org>
Signed-off-by: Johan Hovold <johan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
drivers/rtc/rtc-omap.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 21142e6574a9..f842c216f2dd 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -431,8 +431,10 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
rtc_write(0, OMAP_RTC_INTERRUPTS_REG);

/* enable RTC functional clock */
- if (id_entry->driver_data & OMAP_RTC_HAS_32KCLK_EN)
- rtc_writel(OMAP_RTC_OSC_32KCLK_EN, OMAP_RTC_OSC_REG);
+ if (id_entry->driver_data & OMAP_RTC_HAS_32KCLK_EN) {
+ reg = rtc_read(OMAP_RTC_OSC_REG);
+ rtc_writel(reg | OMAP_RTC_OSC_32KCLK_EN, OMAP_RTC_OSC_REG);
+ }

/* clear old status */
reg = rtc_read(OMAP_RTC_STATUS_REG);
--
2.0.4

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