tegra: fdt: Add NAND controller binding and definitions

Add a NAND controller along with a bindings file for review.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

diff --git a/arch/arm/dts/tegra20.dtsi b/arch/arm/dts/tegra20.dtsi
index f95be58..d936b1e 100644 (file)
--- a/arch/arm/dts/tegra20.dtsi
+++ b/arch/arm/dts/tegra20.dtsi
@@ -204,4 +204,11 @@
                compatible = "nvidia,tegra20-kbc";
                reg = <0x7000e200 0x0078>;
        };
+
+       nand: nand-controller@70008000 {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               compatible = "nvidia,tegra20-nand";
+               reg = <0x70008000 0x100>;
+       };
 };

diff --git a/doc/device-tree-bindings/nand/nvidia,tegra20-nand.txt b/doc/device-tree-bindings/nand/nvidia,tegra20-nand.txt
new file mode 100644 (file)
index 0000000..86ae408
--- /dev/null
+++ b/doc/device-tree-bindings/nand/nvidia,tegra20-nand.txt
@@ -0,0 +1,53 @@
+NAND Flash
+----------
+
+(there isn't yet a generic binding in Linux, so this describes what is in
+U-Boot. There should not be Linux-specific or U-Boot specific binding, just
+a binding that describes this hardware. But agreeing a binding in Linux in
+the absence of a driver may be beyond my powers.)
+
+The device node for a NAND flash device is as follows:
+
+Required properties :
+ - compatible : Should be "manufacturer,device", "nand-flash"
+
+This node should sit inside its controller.
+
+
+Nvidia NAND Controller
+----------------------
+
+The device node for a NAND flash controller is as follows:
+
+Optional properties:
+
+nvidia,wp-gpios : GPIO of write-protect line, three cells in the format:
+               phandle, parameter, flags
+nvidia,nand-width : bus width of the NAND device in bits
+
+ - nvidia,nand-timing : Timing parameters for the NAND. Each is in ns.
+       Order is: MAX_TRP_TREA, TWB, Max(tCS, tCH, tALS, tALH),
+       TWHR, Max(tCS, tCH, tALS, tALH), TWH, TWP, TRH, TADL
+
+       MAX_TRP_TREA is:
+               non-EDO mode: Max(tRP, tREA) + 6ns
+               EDO mode: tRP timing
+
+The 'reg' property should provide the chip select used by the flash chip.
+
+
+Example
+-------
+
+nand-controller@0x70008000 {
+       compatible = "nvidia,tegra20-nand";
+       #address-cells = <1>;
+       #size-cells = <0>;
+       nvidia,wp-gpios = <&gpio 59 0>;         /* PH3 */
+       nvidia,nand-width = <8>;
+       nvidia,timing = <26 100 20 80 20 10 12 10 70>;
+       nand@0 {
+               reg = <0>;
+               compatible = "hynix,hy27uf4g2b", "nand-flash";
+       };
+};