diff options
| -rw-r--r-- | arch/arm/dts/tegra20.dtsi | 7 | ||||
| -rw-r--r-- | doc/device-tree-bindings/nand/nvidia,tegra20-nand.txt | 53 |
2 files changed, 60 insertions, 0 deletions
diff --git a/arch/arm/dts/tegra20.dtsi b/arch/arm/dts/tegra20.dtsi index f95be58..d936b1e 100644 --- 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 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"; + }; +}; |