usb: exynos: describe driver in KConfig

Describe better which driver applies to which SoC, to make configuring
kernel for Samsung SoC easier.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210924133005.111564-1-krzysztof.kozlowski@canonical.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/Kconfig

@@ -66,12 +66,13 @@ config USB_DWC3_OMAP
 	  Say 'Y' or 'M' here if you have one such device
 
 config USB_DWC3_EXYNOS
-	tristate "Samsung Exynos Platform"
+	tristate "Samsung Exynos SoC Platform"
 	depends on (ARCH_EXYNOS || COMPILE_TEST) && OF
 	default USB_DWC3
 	help
-	  Recent Exynos5 SoCs ship with one DesignWare Core USB3 IP inside,
-	  say 'Y' or 'M' if you have one such device.
+	  Recent Samsung Exynos SoCs (Exynos5250, Exynos5410, Exynos542x,
+	  Exynos5800, Exynos5433, Exynos7) ship with one DesignWare Core USB3
+	  IP inside, say 'Y' or 'M' if you have one such device.
 
 config USB_DWC3_PCI
 	tristate "PCIe-based Platforms"

drivers/usb/host/Kconfig

@@ -290,7 +290,8 @@ config USB_EHCI_EXYNOS
 	tristate "EHCI support for Samsung S5P/Exynos SoC Series"
 	depends on ARCH_S5PV210 || ARCH_EXYNOS || COMPILE_TEST
 	help
-	  Enable support for the Samsung Exynos SOC's on-chip EHCI controller.
+	  Enable support for the Samsung S5Pv210 and Exynos SOC's on-chip EHCI
+	  controller.
 
 config USB_EHCI_MV
 	tristate "EHCI support for Marvell PXA/MMP USB controller"
@@ -563,7 +564,8 @@ config USB_OHCI_EXYNOS
 	tristate "OHCI support for Samsung S5P/Exynos SoC Series"
 	depends on ARCH_S5PV210 || ARCH_EXYNOS || COMPILE_TEST
 	help
-	  Enable support for the Samsung Exynos SOC's on-chip OHCI controller.
+	  Enable support for the Samsung S5Pv210 and Exynos SOC's on-chip OHCI
+	  controller.
 
 config USB_CNS3XXX_OHCI
 	bool "Cavium CNS3XXX OHCI Module (DEPRECATED)"