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Broadcom SPI controller

The Broadcom SPI controller is a SPI master found on various SOCs, including
BRCMSTB (BCM7XXX), Cygnus, NSP and NS2. The Broadcom Master SPI hw IP consits
of :
 MSPI : SPI master controller can read and write to a SPI slave device
 BSPI : Broadcom SPI in combination with the MSPI hw IP provides acceleration
	for flash reads and be configured to do single, double, quad lane
	io with 3-byte and 4-byte addressing support.

 Supported Broadcom SoCs have one instance of MSPI+BSPI controller IP.
 MSPI master can be used wihout BSPI. BRCMSTB SoCs have an additional instance
 of a MSPI master without the BSPI to use with non flash slave devices that
 use SPI protocol.

Required properties:

- #address-cells:
    Must be <1>, as required by generic SPI binding.

- #size-cells:
    Must be <0>, also as required by generic SPI binding.

- compatible:
    Must be one of :
    "brcm,spi-bcm-qspi", "brcm,spi-brcmstb-qspi" : MSPI+BSPI on BRCMSTB SoCs
    "brcm,spi-bcm-qspi", "brcm,spi-brcmstb-mspi" : Second Instance of MSPI
						   BRCMSTB  SoCs
    "brcm,spi-bcm7425-qspi", "brcm,spi-bcm-qspi", "brcm,spi-brcmstb-mspi" : Second Instance of MSPI
    			     			  			    BRCMSTB  SoCs
    "brcm,spi-bcm7429-qspi", "brcm,spi-bcm-qspi", "brcm,spi-brcmstb-mspi" : Second Instance of MSPI
    			     			  			    BRCMSTB  SoCs
    "brcm,spi-bcm7435-qspi", "brcm,spi-bcm-qspi", "brcm,spi-brcmstb-mspi" : Second Instance of MSPI
    			     			  			    BRCMSTB  SoCs
    "brcm,spi-bcm7216-qspi", "brcm,spi-bcm-qspi", "brcm,spi-brcmstb-mspi" : Second Instance of MSPI
    			     			  			    BRCMSTB  SoCs
    "brcm,spi-bcm7278-qspi", "brcm,spi-bcm-qspi", "brcm,spi-brcmstb-mspi" : Second Instance of MSPI
    			     			  			    BRCMSTB  SoCs
    "brcm,spi-bcm-qspi", "brcm,spi-nsp-qspi"     : MSPI+BSPI on Cygnus, NSP
    "brcm,spi-bcm-qspi", "brcm,spi-ns2-qspi"     : NS2 SoCs

- reg:
    Define the bases and ranges of the associated I/O address spaces.
    The required range is MSPI controller registers.

- reg-names:
    First name does not matter, but must be reserved for the MSPI controller
    register range as mentioned in 'reg' above, and will typically contain
    - "bspi_regs": BSPI register range, not required with compatible
		   "spi-brcmstb-mspi"
    - "mspi_regs": MSPI register range is required for compatible strings
    - "intr_regs", "intr_status_reg" : Interrupt and status register for
      NSP, NS2, Cygnus SoC

- interrupts
    The interrupts used by the MSPI and/or BSPI controller.

- interrupt-names:
    Names of interrupts associated with MSPI
    - "mspi_halted" :
    - "mspi_done": Indicates that the requested SPI operation is complete.
    - "spi_lr_fullness_reached" : Linear read BSPI pipe full
    - "spi_lr_session_aborted"  : Linear read BSPI pipe aborted
    - "spi_lr_impatient" : Linear read BSPI requested when pipe empty
    - "spi_lr_session_done" : Linear read BSPI session done

- clocks:
    A phandle to the reference clock for this block.

Optional properties:


- native-endian
    Defined when using BE SoC and device uses BE register read/write

Recommended optional m25p80 properties:
- spi-rx-bus-width: Definition as per
                    Documentation/devicetree/bindings/spi/spi-bus.txt

Examples:

BRCMSTB SoC Example:

  SPI Master (MSPI+BSPI) for SPI-NOR access:

    spi@f03e3400 {
		#address-cells = <0x1>;
		#size-cells = <0x0>;
		compatible = "brcm,spi-brcmstb-qspi", "brcm,spi-brcmstb-qspi";
		reg = <0xf03e0920 0x4 0xf03e3400 0x188 0xf03e3200 0x50>;
		reg-names = "cs_reg", "mspi", "bspi";
		interrupts = <0x6 0x5 0x4 0x3 0x2 0x1 0x0>;
		interrupt-parent = <0x1c>;
		interrupt-names = "mspi_halted",
				  "mspi_done",
				  "spi_lr_overread",
				  "spi_lr_session_done",
				  "spi_lr_impatient",
				  "spi_lr_session_aborted",
				  "spi_lr_fullness_reached";

		clocks = <&hif_spi>;
		clock-names = "sw_spi";

		m25p80@0 {
			#size-cells = <0x2>;
			#address-cells = <0x2>;
			compatible = "m25p80";
			reg = <0x0>;
			spi-max-frequency = <0x2625a00>;
			spi-cpol;
			spi-cpha;
			m25p,fast-read;

			flash0.bolt@0 {
				reg = <0x0 0x0 0x0 0x100000>;
			};

			flash0.macadr@100000 {
				reg = <0x0 0x100000 0x0 0x10000>;
			};

			flash0.nvram@110000 {
				reg = <0x0 0x110000 0x0 0x10000>;
			};

			flash0.kernel@120000 {
				reg = <0x0 0x120000 0x0 0x400000>;
			};

			flash0.devtree@520000 {
				reg = <0x0 0x520000 0x0 0x10000>;
			};

			flash0.splash@530000 {
				reg = <0x0 0x530000 0x0 0x80000>;
			};

			flash0@0 {
				reg = <0x0 0x0 0x0 0x4000000>;
			};
		};
	};


    MSPI master for any SPI device :

	spi@f0416000 {
		#address-cells = <1>;
		#size-cells = <0>;
		clocks = <&upg_fixed>;
		compatible = "brcm,spi-brcmstb-qspi", "brcm,spi-brcmstb-mspi";
		reg = <0xf0416000 0x180>;
		reg-names = "mspi";
		interrupts = <0x14>;
		interrupt-parent = <&irq0_aon_intc>;
		interrupt-names = "mspi_done";
	};

iProc SoC Example:

    qspi: spi@18027200 {
	compatible = "brcm,spi-bcm-qspi", "brcm,spi-nsp-qspi";
	reg = <0x18027200 0x184>,
	      <0x18027000 0x124>,
	      <0x1811c408 0x004>,
	      <0x180273a0 0x01c>;
	reg-names = "mspi_regs", "bspi_regs", "intr_regs", "intr_status_reg";
	interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>,
		     <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>,
		     <GIC_SPI 74 IRQ_TYPE_LEVEL_HIGH>,
		     <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
		     <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
		     <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
		     <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
	interrupt-names =
		     "spi_lr_fullness_reached",
		     "spi_lr_session_aborted",
		     "spi_lr_impatient",
		     "spi_lr_session_done",
		     "mspi_done",
		     "mspi_halted";
	clocks = <&iprocmed>;
	clock-names = "iprocmed";
	num-cs = <2>;
	#address-cells = <1>;
	#size-cells = <0>;
    };


 NS2 SoC Example:

	       qspi: spi@66470200 {
		       compatible = "brcm,spi-bcm-qspi", "brcm,spi-ns2-qspi";
		       reg = <0x66470200 0x184>,
			     <0x66470000 0x124>,
			     <0x67017408 0x004>,
			     <0x664703a0 0x01c>;
		       reg-names = "mspi", "bspi", "intr_regs",
			"intr_status_reg";
		       interrupts = <GIC_SPI 419 IRQ_TYPE_LEVEL_HIGH>;
		       interrupt-names = "spi_l1_intr";
			clocks = <&iprocmed>;
			clock-names = "iprocmed";
			num-cs = <2>;
			#address-cells = <1>;
			#size-cells = <0>;
	       };


 m25p80 node for NSP, NS2

	 &qspi {
		      flash: m25p80@0 {
		      #address-cells = <1>;
		      #size-cells = <1>;
		      compatible = "m25p80";
		      reg = <0x0>;
		      spi-max-frequency = <12500000>;
		      m25p,fast-read;
		      spi-cpol;
		      spi-cpha;

		      partition@0 {
				  label = "boot";
				  reg = <0x00000000 0x000a0000>;
		      };

		      partition@a0000 {
				  label = "env";
				  reg = <0x000a0000 0x00060000>;
		      };

		      partition@100000 {
				  label = "system";
				  reg = <0x00100000 0x00600000>;
		      };

		      partition@700000 {
				  label = "rootfs";
				  reg = <0x00700000 0x01900000>;
		      };
	};