On 10/12/2018 10:32 PM, Rob Herring wrote:
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.
Hi Rob,
Only one clock is needed.
I will replace this comment by:
- clocks: the clock needed by the NAND flash controller.
Regards,
Christophe Kerello.
+
+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
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