From 4ca41cb2ae09bfd9f84f053b8b9966e1bb8accc4 Mon Sep 17 00:00:00 2001 From: Ludovic Barre Date: Thu, 13 Apr 2017 19:15:56 +0200 Subject: [PATCH] dt-bindings: mtd: Document the STM32 QSPI bindings This patch adds documentation of device tree bindings for the STM32 QSPI controller. Signed-off-by: Ludovic Barre Acked-by: Rob Herring Signed-off-by: Brian Norris --- .../devicetree/bindings/mtd/stm32-quadspi.txt | 43 ++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/stm32-quadspi.txt diff --git a/Documentation/devicetree/bindings/mtd/stm32-quadspi.txt b/Documentation/devicetree/bindings/mtd/stm32-quadspi.txt new file mode 100644 index 0000000..ddd18c1 --- /dev/null +++ b/Documentation/devicetree/bindings/mtd/stm32-quadspi.txt @@ -0,0 +1,43 @@ +* STMicroelectronics Quad Serial Peripheral Interface(QuadSPI) + +Required properties: +- compatible: should be "st,stm32f469-qspi" +- reg: the first contains the register location and length. + the second contains the memory mapping address and length +- reg-names: should contain the reg names "qspi" "qspi_mm" +- interrupts: should contain the interrupt for the device +- clocks: the phandle of the clock needed by the QSPI controller +- A pinctrl must be defined to set pins in mode of operation for QSPI transfer + +Optional properties: +- resets: must contain the phandle to the reset controller. + +A spi flash must be a child of the nor_flash node and could have some +properties. Also see jedec,spi-nor.txt. + +Required properties: +- reg: chip-Select number (QSPI controller may connect 2 nor flashes) +- spi-max-frequency: max frequency of spi bus + +Optional property: +- spi-rx-bus-width: see ../spi/spi-bus.txt for the description + +Example: + +qspi: spi@a0001000 { + compatible = "st,stm32f469-qspi"; + reg = <0xa0001000 0x1000>, <0x90000000 0x10000000>; + reg-names = "qspi", "qspi_mm"; + interrupts = <91>; + resets = <&rcc STM32F4_AHB3_RESET(QSPI)>; + clocks = <&rcc 0 STM32F4_AHB3_CLOCK(QSPI)>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_qspi0>; + + flash@0 { + reg = <0>; + spi-rx-bus-width = <4>; + spi-max-frequency = <108000000>; + ... + }; +}; -- 2.7.4