[PATCH v6 09/12] ARM: dts: aspeed: anacapa: evt2: Add shunt resistor values for HSC monitors
From: Colin Huang via B4 Relay <devnull+u8813345.gmail.com@kernel.org>
Date: 2026-08-25 10:48:40
Also in:
b4-sent, linux-aspeed, linux-devicetree, lkml
Subsystem:
arm/aspeed machine support, the rest · Maintainers:
Joel Stanley, Andrew Jeffery, Linus Torvalds
From: Peter Shen <redacted> 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 <redacted> --- .../aspeed/aspeed-bmc-facebook-anacapa-evt2.dts | 42 ++++++++++++++++++++++ 1 file changed, 42 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 7fe8d279202a..c36519a601a9 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@@ -43,6 +43,30 @@ gpio@24 { "RPDB_FAN7_PRSNT_N_R", "RPDB_FAN8_PRSNT_N_R", "", ""; }; + + 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>; + }; }; i2c@1 {
@@ -57,6 +81,24 @@ gpio@24 { "","", "",""; }; + + 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>; + }; }; }; };
--
2.34.1