[libata] improve Kconfig help text for new PMP, SFF options
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 3eb6035..292aa9a 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -45,7 +45,8 @@
bool "SATA Port Multiplier support"
default y
help
- This option adds support for SATA Port Multipliers.
+ This option adds support for SATA Port Multipliers
+ (the SATA version of an ethernet hub, or SAS expander).
config SATA_AHCI
tristate "AHCI SATA support"
@@ -79,6 +80,17 @@
This option adds support for ATA controllers with SFF
compliant or similar programming interface.
+ SFF is the legacy IDE interface that has been around since
+ the dawn of time. Almost all PATA controllers have an
+ SFF interface. Many SATA controllers have an SFF interface
+ when configured into a legacy compatibility mode.
+
+ For users with exclusively modern controllers like AHCI,
+ Silicon Image 3124, or Marvell 6440, you may choose to
+ disable this uneeded SFF support.
+
+ If unsure, say Y.
+
if ATA_SFF
config SATA_SVW