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e8de85d5a1
Improve the bindings example by adding an example of how to represent two SPI NOR devices. Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Acked-by: Han Xu <han.xu@nxp.com> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
66 lines
2.0 KiB
Plaintext
66 lines
2.0 KiB
Plaintext
* Freescale Quad Serial Peripheral Interface(QuadSPI)
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Required properties:
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- compatible : Should be "fsl,vf610-qspi", "fsl,imx6sx-qspi",
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"fsl,imx7d-qspi", "fsl,imx6ul-qspi",
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"fsl,ls1021a-qspi"
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or
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"fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi",
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"fsl,ls1043a-qspi" followed by "fsl,ls1021a-qspi"
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- reg : the first contains the register location and length,
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the second contains the memory mapping address and length
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- reg-names: Should contain the reg names "QuadSPI" and "QuadSPI-memory"
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- interrupts : Should contain the interrupt for the device
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- clocks : The clocks needed by the QuadSPI controller
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- clock-names : Should contain the name of the clocks: "qspi_en" and "qspi".
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Optional properties:
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- fsl,qspi-has-second-chip: The controller has two buses, bus A and bus B.
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Each bus can be connected with two NOR flashes.
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Most of the time, each bus only has one NOR flash
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connected, this is the default case.
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But if there are two NOR flashes connected to the
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bus, you should enable this property.
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(Please check the board's schematic.)
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- big-endian : That means the IP register is big endian
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Example:
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qspi0: quadspi@40044000 {
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compatible = "fsl,vf610-qspi";
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reg = <0x40044000 0x1000>, <0x20000000 0x10000000>;
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reg-names = "QuadSPI", "QuadSPI-memory";
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interrupts = <0 24 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&clks VF610_CLK_QSPI0_EN>,
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<&clks VF610_CLK_QSPI0>;
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clock-names = "qspi_en", "qspi";
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flash0: s25fl128s@0 {
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....
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};
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};
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Example showing the usage of two SPI NOR devices:
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&qspi2 {
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_qspi2>;
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status = "okay";
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flash0: n25q256a@0 {
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#address-cells = <1>;
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#size-cells = <1>;
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compatible = "micron,n25q256a", "jedec,spi-nor";
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spi-max-frequency = <29000000>;
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reg = <0>;
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};
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flash1: n25q256a@1 {
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#address-cells = <1>;
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#size-cells = <1>;
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compatible = "micron,n25q256a", "jedec,spi-nor";
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spi-max-frequency = <29000000>;
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reg = <1>;
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};
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};
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