From: Vishwanatha Subbanna <vishwa@xxxxxxxxxxxxxxxxxx>
These LEDs are on the fans and are connected via a
pca9551 i2c expander.
A comment from Milton on why to expose the pins as GPIOs rather
than configuring the pca955x driver to drive the LEDs directly:
The led system insistes on creating a compact map (no holes) (as
does the reset subsystem).
However, this means the relative led number for a pin changes
as the prior pins change from gpio to led configuration.
For example if pins 2 and 7 are leds, they become leds 0 and 1.
Changing pin 5 to also be an led means that pin 7 is now led 2
not led 1 on the led subsystem.
The workaround we have done for existing systems has been to use
gpio leds for pca family devices.
Signed-off-by: Vishwanatha Subbanna <vishwa@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Eddie James <eajames@xxxxxxxxxxxxx>
---
arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts | 41 ++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts b/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts
index aaedd817e1cb..016b0ead5404 100644
--- a/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts
@@ -263,6 +263,47 @@ fan5-presence {
linux,code = <11>;
};
};
+
+ leds {
+ compatible = "gpio-leds";
+
+ fan0 {
+ retain-state-shutdown;
+ default-state = "keep";
+ gpios = <&pca0 0 GPIO_ACTIVE_LOW>;
+ };
+
+ fan1 {
+ retain-state-shutdown;
+ default-state = "keep";
+ gpios = <&pca0 1 GPIO_ACTIVE_LOW>;
+ };
+
+ fan2 {
+ retain-state-shutdown;
+ default-state = "keep";
+ gpios = <&pca0 2 GPIO_ACTIVE_LOW>;
+ };
+
+ fan3 {
+ retain-state-shutdown;
+ default-state = "keep";
+ gpios = <&pca0 3 GPIO_ACTIVE_LOW>;
+ };
+
+ fan4 {
+ retain-state-shutdown;
+ default-state = "keep";
+ gpios = <&pca0 4 GPIO_ACTIVE_LOW>;
+ };
+
+ fan5 {
+ retain-state-shutdown;
+ default-state = "keep";
+ gpios = <&pca0 5 GPIO_ACTIVE_LOW>;
+ };
+ };
+
};
&ehci1 {
--
2.27.0
