107 lines
2.7 KiB
Plaintext
107 lines
2.7 KiB
Plaintext
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LEDs connected to Broadcom BCM6328 controller
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This controller is present on BCM6318, BCM6328, BCM6362 and BCM63268.
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In these SoCs it's possible to control LEDs both as GPIOs or by hardware.
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However, on some devices there are Serial LEDs (LEDs connected to a 74x164
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controller), which can either be controlled by software (exporting the 74x164
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as spi-gpio. See Documentation/devicetree/bindings/gpio/gpio-74x164.txt), or
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by hardware using this driver.
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Some of these Serial LEDs are hardware controlled (e.g. ethernet LEDs) and
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exporting the 74x164 as spi-gpio prevents those LEDs to be hardware
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controlled, so the only chance to keep them working is by using this driver.
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Required properties:
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- compatible : should be "brcm,bcm6328-leds".
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- #address-cells : must be 1.
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- #size-cells : must be 0.
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- reg : BCM6328 LED controller address and size.
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Optional properties:
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- brcm,serial-leds : Boolean, enables Serial LEDs.
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Default : false
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- brcm,serial-mux : Boolean, enables Serial LEDs multiplexing.
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Default : false
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- brcm,serial-clk-low : Boolean, makes clock signal active low.
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Default : false
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- brcm,serial-dat-low : Boolean, makes data signal active low.
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Default : false
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- brcm,serial-shift-inv : Boolean, inverts Serial LEDs shift direction.
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Default : false
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Each LED is represented as a sub-node of the brcm,bcm6328-leds device.
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LED sub-node required properties:
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- reg : LED pin number (only LEDs 0 to 23 are valid).
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LED sub-node optional properties:
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- label : see Documentation/devicetree/bindings/leds/common.txt
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- active-low : Boolean, makes LED active low.
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Default : false
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Examples:
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Scenario 1 : BCM6328 with 4 GPIO LEDs
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leds0: led-controller@10000800 {
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compatible = "brcm,bcm6328-leds";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x10000800 0x24>;
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alarm_red@2 {
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reg = <2>;
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active-low;
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label = "red:alarm";
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};
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inet_green@3 {
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reg = <3>;
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active-low;
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label = "green:inet";
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};
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power_green@4 {
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reg = <4>;
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active-low;
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label = "green:power";
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};
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};
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Scenario 2 : BCM63268 with Serial LEDs
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leds0: led-controller@10001900 {
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compatible = "brcm,bcm6328-leds";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x10001900 0x24>;
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brcm,serial-leds;
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brcm,serial-dat-low;
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brcm,serial-shift-inv;
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inet_red@2 {
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reg = <2>;
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active-low;
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label = "red:inet";
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};
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dsl_green@3 {
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reg = <3>;
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active-low;
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label = "green:dsl";
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};
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usb_green@4 {
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reg = <4>;
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active-low;
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label = "green:usb";
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};
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wps_green@7 {
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reg = <7>;
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active-low;
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label = "green:wps";
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};
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inet_green@8 {
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reg = <8>;
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active-low;
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label = "green:inet";
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};
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power_green@20 {
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reg = <20>;
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active-low;
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label = "green:power";
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};
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};
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