ata: Add APM X-Gene SoC AHCI SATA host controller driver

This patch adds support for the APM X-Gene SoC AHCI SATA host controller
driver. It requires the corresponding APM X-Gene SoC PHY driver. This
initial version only supports Gen3 speed.

Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Tuan Phan <tphan@apm.com>
Signed-off-by: Suman Tripathi <stripathi@apm.com>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 0bec5ac..9f3e326 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -124,6 +124,13 @@
 
 	  If unsure, say N.
 
+config AHCI_XGENE
+	tristate "APM X-Gene 6.0Gbps AHCI SATA host controller support"
+	depends on SATA_AHCI_PLATFORM && (ARM64 || COMPILE_TEST)
+	select PHY_XGENE
+	help
+	 This option enables support for APM X-Gene SoC SATA host controller.
+
 config SATA_FSL
 	tristate "Freescale 3.0Gbps SATA support"
 	depends on FSL_SOC