ARM: dts: OMAP5 / DRA7: indicate that SATA port 0 is available.

commit 87cb12910a2ab6ed41ae951ea4d9c1cc1120199a upstream.

AHCI provides the register PORTS_IMPL to let the software know which port
is supported. The register must be initialized by the bootloader. However
in some cases u-boot doesn't properly initialize this value (if it is not
compiled with SATA support for example or if the SATA initialization fails).
The DTS entry "ports-implemented" can be used to override the value in
PORTS_IMPL.

Without this patch the SATA will not work in the following two cases:

* if there has been a failure to initialize SATA in u-boot.

* if ahci_platform module has been removed and re-inserted. The reason is
  that the content of PORTS_IMPL is lost after the module is removed.
  I suspect that it's because the controller is reset by the hwmod.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Acked-by: Roger Quadros <rogerq@ti.com>
[tony@atomide.com: updated comments with what goes wrong]
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 2 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
index d4fcd68f6349..ef888295aa7b 100644
--- a/arch/arm/boot/dts/dra7.dtsi
+++ b/arch/arm/boot/dts/dra7.dtsi
@@ -1376,6 +1376,7 @@
                         phy-names = "sata-phy";
                         clocks = <&sata_ref_clk>;
                         ti,hwmods = "sata";
+                        ports-implemented = <0x1>;
                 };
 
                 rtc: rtc@48838000 {
diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi
index 25262118ec3d..f8aa0cbc5f01 100644
--- a/arch/arm/boot/dts/omap5.dtsi
+++ b/arch/arm/boot/dts/omap5.dtsi
@@ -985,6 +985,7 @@
                         phy-names = "sata-phy";
                         clocks = <&sata_ref_clk>;
                         ti,hwmods = "sata";
+                        ports-implemented = <0x1>;
                 };
 
                 dss: dss@58000000 {