ARM: mvebu: Add support for NOR flash device on Armada XP-DB board

The Armada XP Development Board (DB-78460-BP) has a NOR flash device
connected to the Device Bus. This commit adds the device tree node
to support this device.

This SoC supports a flexible and dynamic decoding window allocation
scheme; but since this feature is still not implemented we need
to specify the window base address in the device tree node itself.

This base address has been selected in a completely arbitrary fashion.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 32 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/armada-xp-db.dts b/arch/arm/boot/dts/armada-xp-db.dts
index 7c22a20d51b5..f5fc1a3868a2 100644
--- a/arch/arm/boot/dts/armada-xp-db.dts
+++ b/arch/arm/boot/dts/armada-xp-db.dts
@@ -30,6 +30,9 @@
         };
 
         soc {
+                ranges = <0          0 0xd0000000 0x100000      /* Internal registers 1MiB */
+                          0xf0000000 0 0xf0000000 0x1000000>;   /* Device Bus, NOR 16MiB   */
+
                 internal-regs {
                         serial@12000 {
                                 clock-frequency = <250000000>;
@@ -156,6 +159,35 @@
                                         status = "okay";
                                 };
                         };
+
+                        devbus-bootcs@10400 {
+                                status = "okay";
+                                ranges = <0 0xf0000000 0x1000000>;
+
+                                /* Device Bus parameters are required */
+
+                                /* Read parameters */
+                                devbus,bus-width    = <8>;
+                                devbus,turn-off-ps  = <60000>;
+                                devbus,badr-skew-ps = <0>;
+                                devbus,acc-first-ps = <124000>;
+                                devbus,acc-next-ps  = <248000>;
+                                devbus,rd-setup-ps  = <0>;
+                                devbus,rd-hold-ps   = <0>;
+
+                                /* Write parameters */
+                                devbus,sync-enable = <0>;
+                                devbus,wr-high-ps  = <60000>;
+                                devbus,wr-low-ps   = <60000>;
+                                devbus,ale-wr-ps   = <60000>;
+
+                                /* NOR 16 MiB */
+                                nor@0 {
+                                        compatible = "cfi-flash";
+                                        reg = <0 0x1000000>;
+                                        bank-width = <2>;
+                                };
+                        };
                 };
         };
 };