arm: kirkwood: lsxl: Add SPI driver model support

This patch shows how to enable driver model support for the LS-CHLv2 and
LS-XHL boards.

There are a couple of open questions:
 - do I need the u-boot,dm-pre-reloc tags in the device tree?
 - should mach/config.h define CONFIG_DM_SEQ_ALIAS?
 - how can we split this patch or are there any other pending patches
   which does the same and I didn't catch these.

This patch is based on the http://git.denx.de/u-boot-marvell.git (master
branch) and needs the following patches, which are still pending:
  https://patchwork.ozlabs.org/patch/909618/
  https://patchwork.ozlabs.org/patch/909617/
  https://patchwork.ozlabs.org/patch/909973/

Signed-off-by: Michael Walle <michael@walle.cc>
Tested-by: Michael Walle <michael@walle.cc>
Signed-off-by: Stefan Roese <sr@denx.de>

arch/arm/dts/kirkwood-lsxl.dtsi

@@ -8,6 +8,10 @@
 		stdout-path = &uart0;
 	};
 
+	aliases {
+		spi0 = &spi0;
+	};
+
 	ocp@f1000000 {
 		pinctrl: pin-controller@10000 {
 			pmx_power_hdd: pmx-power-hdd {

arch/arm/mach-kirkwood/include/mach/config.h

@@ -59,7 +59,6 @@
  * SPI Flash configuration
  */
 #ifdef CONFIG_CMD_SF
-#define CONFIG_HARD_SPI			1
 #ifndef CONFIG_ENV_SPI_BUS
 # define CONFIG_ENV_SPI_BUS		0
 #endif

configs/lschlv2_defconfig

@@ -23,14 +23,17 @@ CONFIG_CMD_USB=y
 CONFIG_OF_CONTROL=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_DM=y
 CONFIG_MVSATA_IDE=y
 # CONFIG_MMC is not set
+CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_NETDEVICES=y
 CONFIG_MVGBE=y
 CONFIG_SYS_NS16550=y
 CONFIG_SPI=y
+CONFIG_DM_SPI=y
 CONFIG_KIRKWOOD_SPI=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y

configs/lsxhl_defconfig

@@ -23,14 +23,17 @@ CONFIG_CMD_USB=y
 CONFIG_OF_CONTROL=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_DM=y
 CONFIG_MVSATA_IDE=y
 # CONFIG_MMC is not set
+CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_NETDEVICES=y
 CONFIG_MVGBE=y
 CONFIG_SYS_NS16550=y
 CONFIG_SPI=y
+CONFIG_DM_SPI=y
 CONFIG_KIRKWOOD_SPI=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y