0001 * Nuvoton FLASH Interface Unit (FIU) SPI Controller
0002
0003 NPCM FIU supports single, dual and quad communication interface.
0004
0005 The NPCM7XX supports three FIU modules,
0006 FIU0 and FIUx supports two chip selects,
0007 FIU3 support four chip select.
0008
0009 The NPCM8XX supports four FIU modules,
0010 FIU0 and FIUx supports two chip selects,
0011 FIU1 and FIU3 supports four chip selects.
0012
0013 Required properties:
0014 - compatible : "nuvoton,npcm750-fiu" for Poleg NPCM7XX BMC
0015 "nuvoton,npcm845-fiu" for Arbel NPCM8XX BMC
0016 - #address-cells : should be 1.
0017 - #size-cells : should be 0.
0018 - reg : the first contains the register location and length,
0019 the second contains the memory mapping address and length
0020 - reg-names: Should contain the reg names "control" and "memory"
0021 - clocks : phandle of FIU reference clock.
0022
0023 Required properties in case the pins can be muxed:
0024 - pinctrl-names : a pinctrl state named "default" must be defined.
0025 - pinctrl-0 : phandle referencing pin configuration of the device.
0026
0027 Optional property:
0028 - nuvoton,spix-mode: enable spix-mode for an expansion bus to an ASIC or CPLD.
0029
0030 Aliases:
0031 - All the FIU controller nodes should be represented in the aliases node using
0032 the following format 'fiu{n}' where n is a unique number for the alias.
0033 In the NPCM7XX BMC:
0034 fiu0 represent fiu 0 controller
0035 fiu1 represent fiu 3 controller
0036 fiu2 represent fiu x controller
0037
0038 In the NPCM8XX BMC:
0039 fiu0 represent fiu 0 controller
0040 fiu1 represent fiu 1 controller
0041 fiu2 represent fiu 3 controller
0042 fiu3 represent fiu x controller
0043
0044 Example:
0045 fiu3: spi@c00000000 {
0046 compatible = "nuvoton,npcm750-fiu";
0047 #address-cells = <1>;
0048 #size-cells = <0>;
0049 reg = <0xfb000000 0x1000>, <0x80000000 0x10000000>;
0050 reg-names = "control", "memory";
0051 clocks = <&clk NPCM7XX_CLK_AHB>;
0052 pinctrl-names = "default";
0053 pinctrl-0 = <&spi3_pins>;
0054 spi-nor@0 {
0055 ...
0056 };
0057 };
0058
