rtc: pxa: convert to use shared sa1100 functions

Currently, the rtc-sa1100 and rtc-pxa drivers co-exist as rtc-pxa has a
superset of functionality. Having 2 drivers sharing the same memory
resource is not allowed by the driver model if resources are properly
declared. This problem was avoided by not adding memory resources to the
SA1100 RTC driver, but that prevents clean-up of the SA1100 driver.

This commit converts the PXA RTC to use the exported SA1100 RTC
functions. Now the sa1100-rtc and pxa-rtc devices are mutually
exclusive, so we must remove the sa1100-rtc from pxa27x and pxa3xx.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Daniel Mack <daniel@zonque.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: rtc-linux@googlegroups.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 35ea04c50a5c..0f65a222a48a 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1306,11 +1306,13 @@ config RTC_DRV_GENERIC
           just say Y.
 
 config RTC_DRV_PXA
-        tristate "PXA27x/PXA3xx"
-        depends on ARCH_PXA
-        help
-         If you say Y here you will get access to the real time clock
-         built into your PXA27x or PXA3xx CPU.
+       tristate "PXA27x/PXA3xx"
+       depends on ARCH_PXA
+       select RTC_DRV_SA1100
+       help
+         If you say Y here you will get access to the real time clock
+         built into your PXA27x or PXA3xx CPU. This RTC is actually 2 RTCs
+         consisting of an SA1100 compatible RTC and the extended PXA RTC.
 
          This RTC driver uses PXA RTC registers available since pxa27x
          series (RDxR, RYxR) instead of legacy RCNR, RTAR.