Add separate entry for Broadcom STB DPFE driver, selected by platforms
by default.  This allows further customization and compile testing.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---

I have other changes around drivers/memory/Kconfig pending. Sending them
together would avoid conflicts.

---
 arch/arm/mach-bcm/Kconfig    |  1 +
 arch/arm64/Kconfig.platforms |  1 +
 drivers/memory/Kconfig       | 11 +++++++++++
 drivers/memory/Makefile      |  2 +-
 4 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index 1df0ee01ee02..b0c45238e69b 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig

@@ -208,6 +208,7 @@ config ARCH_BRCMSTB
 	select ARM_GIC
 	select ARM_ERRATA_798181 if SMP
 	select HAVE_ARM_ARCH_TIMER
+	select BRCMSTB_DPFE
 	select BRCMSTB_L2_IRQ
 	select BCM7120_L2_IRQ
 	select ARCH_HAS_HOLES_MEMORYMODEL

diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
index ddc3bf75257f..f7791ed0ed6d 100644
--- a/arch/arm64/Kconfig.platforms
+++ b/arch/arm64/Kconfig.platforms

@@ -68,6 +68,7 @@ config ARCH_BRCMSTB
 	bool "Broadcom Set-Top-Box SoCs"
 	select ARCH_HAS_RESET_CONTROLLER
 	select BCM7038_L1_IRQ
+	select BRCMSTB_DPFE

 	select BRCMSTB_L2_IRQ
 	select GENERIC_IRQ_CHIP
 	select PINCTRL

diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
index cd4fc93b50df..fef6f0873fda 100644
--- a/drivers/memory/Kconfig
+++ b/drivers/memory/Kconfig

@@ -54,6 +54,17 @@ config ATMEL_EBI
 	  tree is used. This bus supports NANDs, external ethernet controller,
 	  SRAMs, ATA devices, etc.
 
+config BRCMSTB_DPFE
+	bool "Broadcom STB DPFE driver" if COMPILE_TEST
+	depends on ARCH_BRCMSTB || COMPILE_TEST

+	help
+	  This driver provides access to the DPFE interface of Broadcom
+	  STB SoCs. The firmware running on the DCPU inside the DDR PHY can
+	  provide current information about the system's RAM, for instance
+	  the DRAM refresh rate. This can be used as an indirect indicator
+	  for the DRAM's temperature. Slower refresh rate means cooler RAM,
+	  higher refresh rate means hotter RAM.
+
 config BT1_L2_CTL
 	bool "Baikal-T1 CM2 L2-RAM Cache Control Block"
 	depends on MIPS_BAIKAL_T1 || COMPILE_TEST

diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
index b4533ffff2bc..e71cf7b99641 100644
--- a/drivers/memory/Makefile
+++ b/drivers/memory/Makefile

@@ -10,7 +10,7 @@ endif
 obj-$(CONFIG_ARM_PL172_MPMC)	+= pl172.o
 obj-$(CONFIG_ATMEL_SDRAMC)	+= atmel-sdramc.o
 obj-$(CONFIG_ATMEL_EBI)		+= atmel-ebi.o
-obj-$(CONFIG_ARCH_BRCMSTB)	+= brcmstb_dpfe.o
+obj-$(CONFIG_BRCMSTB_DPFE)	+= brcmstb_dpfe.o
 obj-$(CONFIG_BT1_L2_CTL)	+= bt1-l2-ctl.o
 obj-$(CONFIG_TI_AEMIF)		+= ti-aemif.o
 obj-$(CONFIG_TI_EMIF)		+= emif.o