On Fri, Oct 05, 2018 at 11:41:58AM +0200, christophe.kerello@xxxxxx wrote:
> From: Christophe Kerello <christophe.kerello@xxxxxx>
>
> This patch adds the documentation of the device tree bindings for the STM32
> FMC2 NAND controller.
>
> Signed-off-by: Christophe Kerello <christophe.kerello@xxxxxx>
> ---
> .../devicetree/bindings/mtd/stm32-fmc2-nand.txt | 59 ++++++++++++++++++++++
> 1 file changed, 59 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt
>
> 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 0000000..b620176
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt
> @@ -0,0 +1,59 @@
> +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: Use common clock framework
How many? 'common clock framework' is a Linux thing, not part of
bindings.
> +
> +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"
> +
> +Optional children nodes:
> +Children nodes represent the available NAND chips.
> +
> +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 = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
> + 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>;
> + };
> + };
> --
> 1.9.1
>
