[PATCH] arm64: dts: qcom: monaco: add PMIC PON with power key

Monaco has no PMIC PON node, so the power key is not described at all
and there is no pwrkey input device.  More importantly the board then
has no power-key wakeup source: the only way out of s2idle is the RTC
alarm or one of the PCIe/USB/remoteproc sources, and pressing the power
button does nothing.

Add the PON node with the power key, modelled on the pmm8654au PON on
lemans, which carries the same PMIC: the block lives at 0x1200 and its
interrupts are on block 0x12.

qcom,pmk8350-pwrkey has wakeup_source_default set, so the driver arms
the IRQ as a wakeup source without any additional DT property.

On an IQ-8275-EVK this gives a pmic_pwrkey input device under
c440000.spmi:pmic@0:pon@1200, and:

  # grep pwrkey /sys/kernel/debug/wakeup_sources
  c440000.spmi:pmic@0:pon@1200:pwrkey

"systemctl suspend" followed by a power-key press now resumes the board,
where before it stayed in s2idle until an RTC alarm fired.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Milosz Wasilewski <[email protected]>
---
 arch/arm64/boot/dts/qcom/monaco-pmics.dtsi | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/monaco-pmics.dtsi b/arch/arm64/boot/dts/qcom/monaco-pmics.dtsi
index 6e096b9b7546..aeaef002f791 100644
--- a/arch/arm64/boot/dts/qcom/monaco-pmics.dtsi
+++ b/arch/arm64/boot/dts/qcom/monaco-pmics.dtsi
@@ -14,6 +14,19 @@ pmm8620au_0: pmic@0 {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		pmm8620au_0_pon: pon@1200 {
+			compatible = "qcom,pmk8350-pon";
+			reg = <0x1200>, <0x800>;
+			reg-names = "hlos", "pbs";
+
+			pmm8620au_0_pon_pwrkey: pwrkey {
+				compatible = "qcom,pmk8350-pwrkey";
+				interrupts = <0x0 0x12 0x7 IRQ_TYPE_EDGE_BOTH>;
+				linux,code = <KEY_POWER>;
+				debounce = <15625>;
+			};
+		};
+
 		pmm8620au_0_rtc: rtc@6100 {
 			compatible = "qcom,pmk8350-rtc";
 			reg = <0x6100>, <0x6200>;

base-commit: ed2647532a225739e86c7f236a2ce82764ec2772
-- 
2.43.0