[PATCH v2] spl: ram: hide SPL_RAM_SUPPORT

[Jerome Forissier]

Make SPL_RAM_SUPPORT a hidden Kconfig symbol, automatically selected
by SPL_RAM_DEVICE or SPL_DFU. Avoids the situation where SPL_RAM_SUPPORT
may be enabled without the other two being enabled, which results in the
following build warning:

common/spl/spl_ram.c:19:14: warning: ‘spl_ram_load_read’ defined but not used [-Wunused-function]
   19 | static ulong spl_ram_load_read(struct spl_load_info *load, ulong sector,
      |              ^~~~~~~~~~~~~~~~~

Signed-off-by: Jerome Forissier <jerome.forissier at linaro.org>
---
 common/spl/Kconfig         | 8 ++------
 drivers/usb/gadget/Kconfig | 2 +-
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index c08ff064493..885a012461c 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -1238,15 +1238,11 @@ config SPL_POWER_DOMAIN
 	  the drivers in drivers/power/domain as part of a SPL build.
 
 config SPL_RAM_SUPPORT
-	bool "Support booting from RAM"
-	default y if MICROBLAZE || ARCH_SOCFPGA || ARCH_TEGRA || ARCH_ZYNQ
-	help
-	  Enable booting of an image in RAM. The image can be preloaded or
-	  it can be loaded by SPL directly into RAM (e.g. using USB).
+	bool
 
 config SPL_RAM_DEVICE
 	bool "Support booting from preloaded image in RAM"
-	depends on SPL_RAM_SUPPORT
+	select SPL_RAM_SUPPORT
 	default y if MICROBLAZE || ARCH_SOCFPGA || ARCH_TEGRA || ARCH_ZYNQ
 	help
 	  Enable booting of an image already loaded in RAM. The image has to
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 4621a6fd5e6..b1247a9eeae 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -323,7 +323,7 @@ config SPL_DFU
 	bool "Support DFU (Device Firmware Upgrade) in SPL"
 	select SPL_HASH
 	select SPL_DFU_NO_RESET
-	depends on SPL_RAM_SUPPORT
+	select SPL_RAM_SUPPORT
 	help
 	  This feature enables the DFU (Device Firmware Upgrade) in SPL with
 	  RAM memory device support. The ROM code will load and execute
-- 
2.40.1