[PATCH v4 09/12] ARM: dts: aspeed: anacapa: evt2: Add shunt resistor values for HSC monitors

[Colin Huang via B4 Relay]

From: Colin Huang <u8813345@xxxxxxxxx>

Add shunt resistor configuration for LTC4287 hot-swap controllers on
Anacapa EVT2 platform.

The resistor values are required for accurate current and power
measurement by the driver. These settings reflect the actual BOM used
on EVT2, where different sense resistor values (150 uOhm and 250 uOhm)
are populated across rails.

Without this configuration, the reported readings would be incorrect.

Signed-off-by: Peter Shen <peter.shen@xxxxxxx>
---
 .../aspeed/aspeed-bmc-facebook-anacapa-evt2.dts    | 35 ++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-anacapa-evt2.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-anacapa-evt2.dts
index 703284721224..f913fa3f622d 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-anacapa-evt2.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-anacapa-evt2.dts
@@ -31,6 +31,26 @@ / {
 &i2c8 {
 	i2c-mux@72 {
 		i2c8mux0ch0: i2c@0 {
+			power-monitor@42 {
+				compatible = "lltc,ltc4287";
+				reg = <0x42>;
+				shunt-resistor-micro-ohms = <150>;
+			};
+			power-monitor@43 {
+				compatible = "lltc,ltc4287";
+				reg = <0x43>;
+				shunt-resistor-micro-ohms = <150>;
+			};
+			power-monitor@44 {
+				compatible = "lltc,ltc4287";
+				reg = <0x44>;
+				shunt-resistor-micro-ohms = <250>;
+			};
+			power-monitor@45 {
+				compatible = "lltc,ltc4287";
+				reg = <0x45>;
+				shunt-resistor-micro-ohms = <250>;
+			};
 			gpio@24 {
 				gpio-line-names =
 					"RPDB_EAM2_PRSNT_MOS_N_R", "RPDB_EAM3_PRSNT_MOS_N_R",
@@ -45,6 +65,21 @@ gpio@24 {
 			};
 		};
 		i2c8mux0ch1: i2c@1 {
+			power-monitor@40 {
+				compatible = "lltc,ltc4287";
+				reg = <0x40>;
+				shunt-resistor-micro-ohms = <150>;
+			};
+			power-monitor@41 {
+				compatible = "lltc,ltc4287";
+				reg = <0x41>;
+				shunt-resistor-micro-ohms = <150>;
+			};
+			power-monitor@45 {
+				compatible = "lltc,ltc4287";
+				reg = <0x45>;
+				shunt-resistor-micro-ohms = <250>;
+			};
 			gpio@24 {
 				gpio-line-names =
 					"LPDB_P50V_FAN0_R2_PG","LPDB_P50V_FAN1_R2_PG",

-- 
2.34.1