diff options
Diffstat (limited to 'Documentation/devicetree/bindings/arm/vexpress-sysreg.txt')
-rw-r--r-- | Documentation/devicetree/bindings/arm/vexpress-sysreg.txt | 79 |
1 files changed, 66 insertions, 13 deletions
diff --git a/Documentation/devicetree/bindings/arm/vexpress-sysreg.txt b/Documentation/devicetree/bindings/arm/vexpress-sysreg.txt index 5580e9c4bd85..00318d083c9e 100644 --- a/Documentation/devicetree/bindings/arm/vexpress-sysreg.txt +++ b/Documentation/devicetree/bindings/arm/vexpress-sysreg.txt @@ -8,6 +8,8 @@ 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: @@ -16,35 +18,86 @@ Required node properties: 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>; - gpio-controller; - #gpio-cells = <2>; + + v2m_led_gpios: sys_led@08 { + 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. - -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 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.) +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>; + }; }; |