ddr: fsl: Add Freescale ddr driver

This adds the Freescale ddr driver used on various PowerPC and
Layerscape SoCs. This is based on U-Boot-2019.01 but with many
adjustments:

- PowerPC support has been removed
- CPP #ifdeffery replaced with C
- No more global variables/functions expected from the driver,
  configuration is passed by the board code which calls the driver

We already have the driver in the tree in an older version forked from
U-Boot-2013.04. This version lacks Layerscape support and many quirks
in the driver are PowerPC specific. Since the existing driver should
work on all known PowerPC and PowerPC is a dead end I decided not to
improve the existing driver and instead add a new Layerscape specific
driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/ddr/fsl/Kconfig b/drivers/ddr/fsl/Kconfig
new file mode 100644
index 0000000000..9cae9028a2
--- /dev/null
+++ b/drivers/ddr/fsl/Kconfig
@@ -0,0 +1,16 @@
+config DDR_FSL
+	bool
+
+if DDR_FSL
+
+config DDR_FSL_DDR1
+	bool "Enable DDR1 support"
+config DDR_FSL_DDR2
+	bool "Enable DDR2 support"
+config DDR_FSL_DDR3
+	bool "Enable DDR3 support"
+config DDR_FSL_DDR4
+	bool "Enable DDR4 support"
+
+endif
+