| LEDs connected to Broadcom BCM6328 controller |
| |
| This controller is present on BCM6318, BCM6328, BCM6362 and BCM63268. |
| In these SoCs it's possible to control LEDs both as GPIOs or by hardware. |
| However, on some devices there are Serial LEDs (LEDs connected to a 74x164 |
| controller), which can either be controlled by software (exporting the 74x164 |
| as spi-gpio. See Documentation/devicetree/bindings/gpio/gpio-74x164.txt), or |
| by hardware using this driver. |
| Some of these Serial LEDs are hardware controlled (e.g. ethernet LEDs) and |
| exporting the 74x164 as spi-gpio prevents those LEDs to be hardware |
| controlled, so the only chance to keep them working is by using this driver. |
| |
| BCM6328 LED controller has a HWDIS register, which controls whether a LED |
| should be controlled by a hardware signal instead of the MODE register value, |
| with 0 meaning hardware control enabled and 1 hardware control disabled. This |
| is usually 1:1 for hardware to LED signals, but through the activity/link |
| registers you have some limited control over rerouting the LEDs (as |
| explained later in brcm,link-signal-sources). Even if a LED is hardware |
| controlled you are still able to make it blink or light it up if it isn't, |
| but you can't turn it off if the hardware decides to light it up. For this |
| reason, hardware controlled LEDs aren't registered as LED class devices. |
| |
| Required properties: |
| - compatible : should be "brcm,bcm6328-leds". |
| - #address-cells : must be 1. |
| - #size-cells : must be 0. |
| - reg : BCM6328 LED controller address and size. |
| |
| Optional properties: |
| - brcm,serial-leds : Boolean, enables Serial LEDs. |
| Default : false |
| |
| Each LED is represented as a sub-node of the brcm,bcm6328-leds device. |
| |
| LED sub-node required properties: |
| - reg : LED pin number (only LEDs 0 to 23 are valid). |
| |
| LED sub-node optional properties: |
| a) Optional properties for sub-nodes related to software controlled LEDs: |
| - label : see Documentation/devicetree/bindings/leds/common.txt |
| - active-low : Boolean, makes LED active low. |
| Default : false |
| - default-state : see |
| Documentation/devicetree/bindings/leds/leds-gpio.txt |
| - linux,default-trigger : see |
| Documentation/devicetree/bindings/leds/common.txt |
| |
| b) Optional properties for sub-nodes related to hardware controlled LEDs: |
| - brcm,hardware-controlled : Boolean, makes this LED hardware controlled. |
| Default : false |
| - brcm,link-signal-sources : An array of hardware link |
| signal sources. Up to four link hardware signals can get muxed into |
| these LEDs. Only valid for LEDs 0 to 7, where LED signals 0 to 3 may |
| be muxed to LEDs 0 to 3, and signals 4 to 7 may be muxed to LEDs |
| 4 to 7. A signal can be muxed to more than one LED, and one LED can |
| have more than one source signal. |
| - brcm,activity-signal-sources : An array of hardware activity |
| signal sources. Up to four activity hardware signals can get muxed into |
| these LEDs. Only valid for LEDs 0 to 7, where LED signals 0 to 3 may |
| be muxed to LEDs 0 to 3, and signals 4 to 7 may be muxed to LEDs |
| 4 to 7. A signal can be muxed to more than one LED, and one LED can |
| have more than one source signal. |
| |
| Examples: |
| Scenario 1 : BCM6328 with 4 EPHY LEDs |
| leds0: led-controller@10000800 { |
| compatible = "brcm,bcm6328-leds"; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| reg = <0x10000800 0x24>; |
| |
| alarm_red@2 { |
| reg = <2>; |
| active-low; |
| label = "red:alarm"; |
| }; |
| inet_green@3 { |
| reg = <3>; |
| active-low; |
| label = "green:inet"; |
| }; |
| power_green@4 { |
| reg = <4>; |
| active-low; |
| label = "green:power"; |
| default-state = "on"; |
| }; |
| ephy0_spd@17 { |
| reg = <17>; |
| brcm,hardware-controlled; |
| }; |
| ephy1_spd@18 { |
| reg = <18>; |
| brcm,hardware-controlled; |
| }; |
| ephy2_spd@19 { |
| reg = <19>; |
| brcm,hardware-controlled; |
| }; |
| ephy3_spd@20 { |
| reg = <20>; |
| brcm,hardware-controlled; |
| }; |
| }; |
| |
| Scenario 2 : BCM63268 with Serial/GPHY0 LEDs |
| leds0: led-controller@10001900 { |
| compatible = "brcm,bcm6328-leds"; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| reg = <0x10001900 0x24>; |
| brcm,serial-leds; |
| |
| gphy0_spd0@0 { |
| reg = <0>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <0>; |
| }; |
| gphy0_spd1@1 { |
| reg = <1>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <1>; |
| }; |
| inet_red@2 { |
| reg = <2>; |
| active-low; |
| label = "red:inet"; |
| }; |
| dsl_green@3 { |
| reg = <3>; |
| active-low; |
| label = "green:dsl"; |
| }; |
| usb_green@4 { |
| reg = <4>; |
| active-low; |
| label = "green:usb"; |
| }; |
| wps_green@7 { |
| reg = <7>; |
| active-low; |
| label = "green:wps"; |
| }; |
| inet_green@8 { |
| reg = <8>; |
| active-low; |
| label = "green:inet"; |
| }; |
| ephy0_act@9 { |
| reg = <9>; |
| brcm,hardware-controlled; |
| }; |
| ephy1_act@10 { |
| reg = <10>; |
| brcm,hardware-controlled; |
| }; |
| ephy2_act@11 { |
| reg = <11>; |
| brcm,hardware-controlled; |
| }; |
| gphy0_act@12 { |
| reg = <12>; |
| brcm,hardware-controlled; |
| }; |
| ephy0_spd@13 { |
| reg = <13>; |
| brcm,hardware-controlled; |
| }; |
| ephy1_spd@14 { |
| reg = <14>; |
| brcm,hardware-controlled; |
| }; |
| ephy2_spd@15 { |
| reg = <15>; |
| brcm,hardware-controlled; |
| }; |
| power_green@20 { |
| reg = <20>; |
| active-low; |
| label = "green:power"; |
| default-state = "on"; |
| }; |
| }; |
| |
| Scenario 3 : BCM6362 with 1 LED for each EPHY |
| leds0: led-controller@10001900 { |
| compatible = "brcm,bcm6328-leds"; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| reg = <0x10001900 0x24>; |
| |
| usb@0 { |
| reg = <0>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <0>; |
| brcm,activity-signal-sources = <0>; |
| /* USB link/activity routed to USB LED */ |
| }; |
| inet@1 { |
| reg = <1>; |
| brcm,hardware-controlled; |
| brcm,activity-signal-sources = <1>; |
| /* INET activity routed to INET LED */ |
| }; |
| ephy0@4 { |
| reg = <4>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <4>; |
| /* EPHY0 link routed to EPHY0 LED */ |
| }; |
| ephy1@5 { |
| reg = <5>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <5>; |
| /* EPHY1 link routed to EPHY1 LED */ |
| }; |
| ephy2@6 { |
| reg = <6>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <6>; |
| /* EPHY2 link routed to EPHY2 LED */ |
| }; |
| ephy3@7 { |
| reg = <7>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <7>; |
| /* EPHY3 link routed to EPHY3 LED */ |
| }; |
| power_green@20 { |
| reg = <20>; |
| active-low; |
| label = "green:power"; |
| default-state = "on"; |
| }; |
| }; |
| |
| Scenario 4 : BCM6362 with 1 LED for all EPHYs |
| leds0: led-controller@10001900 { |
| compatible = "brcm,bcm6328-leds"; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| reg = <0x10001900 0x24>; |
| |
| usb@0 { |
| reg = <0>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <0 1>; |
| brcm,activity-signal-sources = <0 1>; |
| /* USB/INET link/activity routed to USB LED */ |
| }; |
| ephy@4 { |
| reg = <4>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <4 5 6 7>; |
| /* EPHY0/1/2/3 link routed to EPHY0 LED */ |
| }; |
| power_green@20 { |
| reg = <20>; |
| active-low; |
| label = "green:power"; |
| default-state = "on"; |
| }; |
| }; |
| |
| Scenario 5 : BCM6362 with EPHY LEDs swapped |
| leds0: led-controller@10001900 { |
| compatible = "brcm,bcm6328-leds"; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| reg = <0x10001900 0x24>; |
| |
| usb@0 { |
| reg = <0>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <0>; |
| brcm,activity-signal-sources = <0 1>; |
| /* USB link/act and INET act routed to USB LED */ |
| }; |
| ephy0@4 { |
| reg = <4>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <7>; |
| /* EPHY3 link routed to EPHY0 LED */ |
| }; |
| ephy1@5 { |
| reg = <5>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <6>; |
| /* EPHY2 link routed to EPHY1 LED */ |
| }; |
| ephy2@6 { |
| reg = <6>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <5>; |
| /* EPHY1 link routed to EPHY2 LED */ |
| }; |
| ephy3@7 { |
| reg = <7>; |
| brcm,hardware-controlled; |
| brcm,link-signal-sources = <4>; |
| /* EPHY0 link routed to EPHY3 LED */ |
| }; |
| power_green@20 { |
| reg = <20>; |
| active-low; |
| label = "green:power"; |
| default-state = "on"; |
| }; |
| }; |