[libata] improve Kconfig help text for new PMP, SFF options

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 3eb6035..292aa9a 100644 (file)
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -45,7 +45,8 @@ config SATA_PMP
        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 @@ config ATA_SFF
          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