rtc: at91sam9: rework the Kconfig description

Remove all references to AT91CAP9 SoC which has been removed.
Rework help message to remove any specific references to AT91SAM9 SoCs.
State that RTC_DRV_AT91SAM9_RTT and RTC_DRV_AT91SAM9_GPBR options are only
used when booting non DT boards.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Johan Hovold <johan@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

1 files changed, 15 insertions, 8 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 7b1f59258062..5bdd6524f91b 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1109,17 +1109,18 @@ config RTC_DRV_AT91RM9200
           this is powered by the backup power supply.
 
 config RTC_DRV_AT91SAM9
-        tristate "AT91SAM9x/AT91CAP9 RTT as RTC"
+        tristate "AT91SAM9 RTT as RTC"
         depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
         select MFD_SYSCON
         help
-          RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
-          (Real Time Timer). These timers are powered by the backup power
-          supply (such as a small coin cell battery), but do not need to
-          be used as RTCs.
-
-          (On AT91SAM9rl and AT91SAM9G45 chips you probably want to use the
-          dedicated RTC module and leave the RTT available for other uses.)
+          Some AT91SAM9 SoCs provide an RTT (Real Time Timer) block which
+          can be used as an RTC thanks to the backup power supply (e.g. a
+          small coin cell battery) which keeps this block and the GPBR
+          (General Purpose Backup Registers) block powered when the device
+          is shutdown.
+          Some AT91SAM9 SoCs provide a real RTC block, on those ones you'd
+          probably want to use the real RTC block instead of the "RTT as an
+          RTC" driver.
 
 config RTC_DRV_AT91SAM9_RTT
         int
@@ -1128,6 +1129,9 @@ config RTC_DRV_AT91SAM9_RTT
         prompt "RTT module Number" if ARCH_AT91SAM9263
         depends on RTC_DRV_AT91SAM9
         help
+          This option is only relevant for legacy board support and
+          won't be used when booting a DT board.
+
           More than one RTT module is available. You can choose which
           one will be used as an RTC. The default of zero is normally
           OK to use, though some systems use that for non-RTC purposes.
@@ -1140,6 +1144,9 @@ config RTC_DRV_AT91SAM9_GPBR
         prompt "Backup Register Number"
         depends on RTC_DRV_AT91SAM9
         help
+          This option is only relevant for legacy board support and
+          won't be used when booting a DT board.
+
           The RTC driver needs to use one of the General Purpose Backup
           Registers (GPBRs) as well as the RTT. You can choose which one
           will be used. The default of zero is normally OK to use, but