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-ARM Versatile Express system registers
---------------------------------------
-
-This is a system control registers block, providing multiple low level
-platform functions like board detection and identification, software
-interrupt generation, MMC and NOR Flash control etc.
-
-Required node properties:
-- compatible value : = "arm,vexpress,sysreg";
-- reg : physical base address and the size of the registers window
-
-Deprecated properties, replaced by GPIO subnodes (see below):
-- gpio-controller : specifies that the node is a GPIO controller
-- #gpio-cells : size of the GPIO specifier, should be 2:
- - first cell is the pseudo-GPIO line number:
- 0 - MMC CARDIN
- 1 - MMC WPROT
- 2 - NOR FLASH WPn
- - second cell can take standard GPIO flags (currently ignored).
-
-Control registers providing pseudo-GPIO lines must be represented
-by subnodes, each of them requiring the following properties:
-- compatible value : one of
- "arm,vexpress-sysreg,sys_led"
- "arm,vexpress-sysreg,sys_mci"
- "arm,vexpress-sysreg,sys_flash"
-- gpio-controller : makes the node a GPIO controller
-- #gpio-cells : size of the GPIO specifier, must be 2:
- - first cell is the function number:
- - for sys_led : 0..7 = LED 0..7
- - for sys_mci : 0 = MMC CARDIN, 1 = MMC WPROT
- - for sys_flash : 0 = NOR FLASH WPn
- - second cell can take standard GPIO flags (currently ignored).
-
-Example:
- v2m_sysreg: sysreg@10000000 {
- compatible = "arm,vexpress-sysreg";
- reg = <0x10000000 0x1000>;
-
- v2m_led_gpios: sys_led@8 {
- compatible = "arm,vexpress-sysreg,sys_led";
- gpio-controller;
- #gpio-cells = <2>;
- };
-
- v2m_mmc_gpios: sys_mci@48 {
- compatible = "arm,vexpress-sysreg,sys_mci";
- gpio-controller;
- #gpio-cells = <2>;
- };
-
- v2m_flash_gpios: sys_flash@4c {
- compatible = "arm,vexpress-sysreg,sys_flash";
- gpio-controller;
- #gpio-cells = <2>;
- };
- };
-
-This block also can also act a bridge to the platform's configuration
-bus via "system control" interface, addressing devices with site number,
-position in the board stack, config controller, function and device
-numbers - see motherboard's TRM for more details. All configuration
-controller accessible via this interface must reference the sysreg
-node via "arm,vexpress,config-bridge" phandle and define appropriate
-topology properties - see main vexpress node documentation for more
-details. Each child of such node describes one function and must
-define the following properties:
-- compatible value : must be one of (corresponding to the TRM):
- "arm,vexpress-amp"
- "arm,vexpress-dvimode"
- "arm,vexpress-energy"
- "arm,vexpress-muxfpga"
- "arm,vexpress-osc"
- "arm,vexpress-power"
- "arm,vexpress-reboot"
- "arm,vexpress-reset"
- "arm,vexpress-scc"
- "arm,vexpress-shutdown"
- "arm,vexpress-temp"
- "arm,vexpress-volt"
-- arm,vexpress-sysreg,func : must contain a set of two cells long groups:
- - first cell of each group defines the function number
- (eg. 1 for clock generator, 2 for voltage regulators etc.)
- - second cell of each group defines device number (eg. osc 0,
- osc 1 etc.)
- - some functions (eg. energy meter, with its 64 bit long counter)
- are using more than one function/device number pair
-
-Example:
- mcc {
- compatible = "arm,vexpress,config-bus";
- arm,vexpress,config-bridge = <&v2m_sysreg>;
-
- osc@0 {
- compatible = "arm,vexpress-osc";
- arm,vexpress-sysreg,func = <1 0>;
- };
-
- energy@0 {
- compatible = "arm,vexpress-energy";
- arm,vexpress-sysreg,func = <13 0>, <13 1>;
- };
- };