[PATCH linux dev-4.10 v6 1/2] ARM: dts: aspeed: Witherspoon add gpio-keys-polled for fan presence

[Christopher Bostic]

Add gpio-keys-polled  node for pca955x fan presence lines.
Add GPIO details to pca955x for the presence lines as well.

Polling period of 1 second determined to be the max acceptable
value based on discussions with Brad Bishop and Matt Spinler.
Tested with gpiomon program - verified.

Signed-off-by: Christopher Bostic <cbostic at linux.vnet.ibm.com>
---
v6 - Add gpio pin details for fan presence to pca955x node
v5 - Fix gpio-keys-polled driver probe errors.  Missing pca955x
     gpio cells property and wrong format for poll-interval.
v4 - Add details regarding polling period to commit message.
v3 - Remove 'autorepeat'
   - Increase polling period to 1 second.
   - Remove GPIO specifiers from pca955x in dev tree
v2 - Change 'linux,code' from a unique global value to a local one
     for all the gpio-keys-polled devices.
---
 arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts | 52 ++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts b/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts
index 5afc03a..70328668 100644
--- a/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts
@@ -56,6 +56,37 @@
 		};
 	};
 
+	gpio-keys-polled {
+		compatible = "gpio-keys-polled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		poll-interval = <1000>;
+
+		fan0-presence {
+			label = "fan0-presence";
+			gpios = <&pca0 4 GPIO_ACTIVE_LOW>;
+			linux,code = <4>;
+		};
+
+		fan1-presence {
+			label = "fan1-presence";
+			gpios = <&pca0 5 GPIO_ACTIVE_LOW>;
+			linux,code = <5>;
+		};
+
+		fan2-presence {
+			label = "fan2-presence";
+			gpios = <&pca0 6 GPIO_ACTIVE_LOW>;
+			linux,code = <6>;
+		};
+
+		fan3-presence {
+			label = "fan3-presence";
+			gpios = <&pca0 7 GPIO_ACTIVE_LOW>;
+			linux,code = <7>;
+		};
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -277,6 +308,7 @@
 		reg = <0x60>;
 		#address-cells = <1>;
 		#size-cells = <0>;
+		#gpio-cells = <2>;
 
 		fan0: led at 0 {
 			label = "fan0";
@@ -302,6 +334,26 @@
 			reg = <3>;
 			type = <PCA955X_TYPE_LED>;
 		};
+		fan0_pres_gpio: gpio at 4 {
+			label = "fan0_presence";
+			reg = <4>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+		fan1_pres_gpio: gpio at 5 {
+			label = "fan1_presence";
+			reg = <5>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+		fan2_pres_gpio: gpio at 6 {
+			label = "fan2_presence";
+			reg = <6>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
+		fan3_pres_gpio: gpio at 7 {
+			label = "fan3_presence";
+			reg = <7>;
+			type = <PCA955X_TYPE_GPIO>;
+		};
 		front_fault: led at 13 {
 			label = "front-fault";
 			default-state = "keep";
-- 
1.8.2.2