[PATCH v4 3/6] mtd: nand: vf610_nfc: add device tree bindings
From: stefan@agner.ch (Stefan Agner)
Date: 2015-03-25 16:29:33
Also in:
linux-devicetree, lkml
Subsystem:
memory technology devices (mtd), open firmware and flattened device tree bindings, the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Signed-off-by: Bill Pringlemeir <redacted> Signed-off-by: Stefan Agner <stefan@agner.ch> --- .../devicetree/bindings/mtd/vf610-nfc.txt | 45 ++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/vf610-nfc.txt
diff --git a/Documentation/devicetree/bindings/mtd/vf610-nfc.txt b/Documentation/devicetree/bindings/mtd/vf610-nfc.txt
new file mode 100644
index 0000000..5f0d344
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/vf610-nfc.txt@@ -0,0 +1,45 @@ +Freescale's NAND flash controller (NFC) + +This variant of the Freescale NAND flash controller (NFC) is on Vybrid (vf610), +MPC5125, MCF54418 and Kinetis K70. + +Required properties: +- compatible: "fsl,vf610-nfc" +- reg: address range of the NFC +- interrupts: interrupt of the NFC +- nand-bus-width: see nand.txt +- nand-ecc-mode: see nand.txt +- nand-on-flash-bbt: see nand.txt +- assigned-clocks: main clock from the SoC, for Vybrid <&clks VF610_CLK_NFC>; +- assigned-clock-rates: The NAND bus timing is derived from this clock + rate and should not exceed maximum timing for any NAND memory chip + in a board stuffing. Typical NAND memory timings derived from this + clock are found in the SoC hardware reference manual. Furthermore, + there might be restrictions on maximum rates when using hardware ECC. + +- #address-cells, #size-cells : Must be present if the device has sub-nodes + representing partitions. + +Required properties for hardware ECC: +- nand-ecc-strength: supported strengths are 24 and 32 bit (see nand.txt) +- nand-ecc-step-size: step size equals page size, currently only 2k pages are + supported + +Example: + + nfc: nand at 400e0000 { + compatible = "fsl,vf610-nfc"; + #address-cells = <1>; + #size-cells = <1>; + reg = <0x400e0000 0x4000>; + interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&clks VF610_CLK_NFC>; + clock-names = "nfc"; + assigned-clocks = <&clks VF610_CLK_NFC>; + assigned-clock-rates = <33000000>; + nand-bus-width = <8>; + nand-ecc-mode = "hw"; + nand-on-flash-bbt; + nand-ecc-strength = <32>; + nand-ecc-step-size = <2048>; + };
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2.3.3