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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
-- 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).
-
-Example:
- v2m_sysreg: sysreg@10000000 {
- compatible = "arm,vexpress-sysreg";
- reg = <0x10000000 0x1000>;
- 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.
-
-The node describing a config device must refer to the sysreg node via
-"arm,vexpress,config-bridge" phandle (can be also defined in the node's
-parent) and relies on the board topology properties - see main vexpress
-node documentation for more details. It must must also define the
-following property:
-- arm,vexpress-sysreg,func : must contain two cells:
- - first cell defines function number (eg. 1 for clock generator,
- 2 for voltage regulators etc.)
- - device number (eg. osc 0, osc 1 etc.)
-
-Example:
- mcc {
- arm,vexpress,config-bridge = <&v2m_sysreg>;
-
- osc@0 {
- compatible = "arm,vexpress-osc";
- arm,vexpress-sysreg,func = <1 0>;
- };
- };