From 8c6e7fd9ac7960c7ca129678c75bdb599f1c9968 Mon Sep 17 00:00:00 2001 From: Christophe Kerello Date: Fri, 14 Dec 2018 10:58:06 +0100 Subject: dt-bindings: mtd: stm32_fmc2: add STM32 FMC2 NAND controller documentation This patch adds the documentation of the device tree bindings for the STM32 FMC2 NAND controller. Signed-off-by: Christophe Kerello Reviewed-by: Boris Brezillon Signed-off-by: Miquel Raynal --- .../devicetree/bindings/mtd/stm32-fmc2-nand.txt | 61 ++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt b/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt new file mode 100644 index 000000000000..ad2bef826582 --- /dev/null +++ b/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt @@ -0,0 +1,61 @@ +STMicroelectronics Flexible Memory Controller 2 (FMC2) +NAND Interface + +Required properties: +- compatible: Should be one of: + * st,stm32mp15-fmc2 +- reg: NAND flash controller memory areas. + First region contains the register location. + Regions 2 to 4 respectively contain the data, command, + and address space for CS0. + Regions 5 to 7 contain the same areas for CS1. +- interrupts: The interrupt number +- pinctrl-0: Standard Pinctrl phandle (see: pinctrl/pinctrl-bindings.txt) +- clocks: The clock needed by the NAND flash controller + +Optional properties: +- resets: Reference to a reset controller asserting the FMC controller +- dmas: DMA specifiers (see: dma/stm32-mdma.txt) +- dma-names: Must be "tx", "rx" and "ecc" + +* NAND device bindings: + +Required properties: +- reg: describes the CS lines assigned to the NAND device. + +Optional properties: +- nand-on-flash-bbt: see nand.txt +- nand-ecc-strength: see nand.txt +- nand-ecc-step-size: see nand.txt + +The following ECC strength and step size are currently supported: + - nand-ecc-strength = <1>, nand-ecc-step-size = <512> (Hamming) + - nand-ecc-strength = <4>, nand-ecc-step-size = <512> (BCH4) + - nand-ecc-strength = <8>, nand-ecc-step-size = <512> (BCH8) (default) + +Example: + + fmc: nand-controller@58002000 { + compatible = "st,stm32mp15-fmc2"; + reg = <0x58002000 0x1000>, + <0x80000000 0x1000>, + <0x88010000 0x1000>, + <0x88020000 0x1000>, + <0x81000000 0x1000>, + <0x89010000 0x1000>, + <0x89020000 0x1000>; + interrupts = ; + clocks = <&rcc FMC_K>; + resets = <&rcc FMC_R>; + pinctrl-names = "default"; + pinctrl-0 = <&fmc_pins_a>; + #address-cells = <1>; + #size-cells = <0>; + + nand@0 { + reg = <0>; + nand-on-flash-bbt; + #address-cells = <1>; + #size-cells = <1>; + }; + }; -- cgit v1.2.3-55-g7522