scsi/atari_scsi: Don't select CONFIG_NVRAM

On powerpc, setting CONFIG_NVRAM=n builds a kernel with no NVRAM support.
Setting CONFIG_NVRAM=m enables the /dev/nvram misc device module without
enabling NVRAM support in drivers. Setting CONFIG_NVRAM=y enables the
misc device (built-in) and also enables NVRAM support in drivers.

m68k shares the valkyriefb driver with powerpc, and since that driver uses
NVRAM, it is affected by CONFIG_ATARI_SCSI, because of the use of
"select NVRAM". We can avoid the "select" here, but drivers still have
to interpret the CONFIG_NVRAM symbol consistently regardless of platform.

In this patch and the subsequent fbdev driver patch, the convention is
adopted across all relevant platforms whereby NVRAM functionality gets
enabled in a given device driver when the nvram misc device is built-in
or when both drivers are modules.

Acked-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 5 insertions, 8 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 2e2ffe7010aa..a8cac68de177 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -244,7 +244,7 @@ source "drivers/char/hw_random/Kconfig"
 
 config NVRAM
         tristate "/dev/nvram support"
-        depends on ATARI || X86 || GENERIC_NVRAM
+        depends on X86 || GENERIC_NVRAM
         ---help---
           If you say Y here and create a character special file /dev/nvram
           with major number 10 and minor number 144 using mknod ("man mknod"),
@@ -262,9 +262,6 @@ config NVRAM
           should NEVER idly tamper with it. See Ralf Brown's interrupt list
           for a guide to the use of CMOS bytes by your BIOS.
 
-          On Atari machines, /dev/nvram is always configured and does not need
-          to be selected.
-
           To compile this driver as a module, choose M here: the
           module will be called nvram.
 
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index f38882f6f37d..8f9d9e9fa695 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1369,14 +1369,14 @@ config ATARI_SCSI
         tristate "Atari native SCSI support"
         depends on ATARI && SCSI
         select SCSI_SPI_ATTRS
-        select NVRAM
         ---help---
           If you have an Atari with built-in NCR5380 SCSI controller (TT,
           Falcon, ...) say Y to get it supported. Of course also, if you have
           a compatible SCSI controller (e.g. for Medusa).
 
-          To compile this driver as a module, choose M here: the
-          module will be called atari_scsi.
+          To compile this driver as a module, choose M here: the module will
+          be called atari_scsi. If you also enable NVRAM support, the SCSI
+          host's ID is taken from the setting in TT RTC NVRAM.
 
           This driver supports both styles of NCR integration into the
           system: the TT style (separate DMA), and the Falcon style (via
diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c
index a503dc50c4f8..78b43200c99e 100644
--- a/drivers/scsi/atari_scsi.c
+++ b/drivers/scsi/atari_scsi.c
@@ -757,7 +757,7 @@ static int __init atari_scsi_probe(struct platform_device *pdev)
 
         if (setup_hostid >= 0) {
                 atari_scsi_template.this_id = setup_hostid & 7;
-        } else {
+        } else if (IS_REACHABLE(CONFIG_NVRAM)) {
                 /* Test if a host id is set in the NVRam */
                 if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) {
                         unsigned char b = nvram_read_byte(16);