diff --git a/src/mainboard/google/brya/variants/dirks/ramstage.c b/src/mainboard/google/brya/variants/dirks/ramstage.c
index d66241f413..04f9c6df83 100644
--- a/src/mainboard/google/brya/variants/dirks/ramstage.c
+++ b/src/mainboard/google/brya/variants/dirks/ramstage.c
@@ -1,5 +1,12 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
+#include <baseboard/variants.h>
+#include <chip.h>
+#include <device/device.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include <ec/google/chromeec/ec.h>
+#include <intelblocks/power_limit.h>
 #include <soc/ramstage.h>
 
 void mainboard_silicon_init_params(FSP_S_CONFIG *params)
@@ -10,3 +17,49 @@ void mainboard_silicon_init_params(FSP_S_CONFIG *params)
 	params->MappingPchXhciUsbA[1] = 2;
 
 }
+
+const struct cpu_power_limits limits[] = {
+	/* SKU_ID, TDP (Watts), pl1_min, pl1_max, pl2_min, pl2_max, pl4 */
+	{ PCI_DID_INTEL_ADL_N_ID_1, 7, 3000, 6000,  25000,  25000, 78000 },
+	{ PCI_DID_INTEL_ADL_N_ID_2, 6, 3000, 6000,  25000,  25000, 78000 },
+	{ PCI_DID_INTEL_ADL_N_ID_3, 6, 3000, 6000,  25000,  25000, 78000 },
+};
+
+const struct system_power_limits sys_limits[] = {
+	/* SKU_ID, TDP (Watts), psys_pl2 (Watts) */
+	{ PCI_DID_INTEL_ADL_N_ID_1, 7, 63 },
+	{ PCI_DID_INTEL_ADL_N_ID_2, 6, 63 },
+	{ PCI_DID_INTEL_ADL_N_ID_3, 6, 63 },
+};
+
+/*
+ * Psys_pmax considerations.
+ *
+ * Given the hardware design in dirks, the serial shunt resistor is 0.01ohm.
+ * The full scale of hardware PSYS signal 1.6v maps to system current 6.009A
+ * instead of real system power. The equation is shown below:
+ * PSYS = 1.6v ~= (0.01ohm x 6.009A) x 50 (INA213, gain 50V/V) x PR222/(PR222 + R3193)
+ * PR222/(PR222 + R3193) = 0.5325 = 36K / (36K + 31.6K)
+ *
+ * The Psys_pmax is a SW setting which tells IMVP9.1 the mapping between system input
+ * current and the actual system power. Since there is no voltage information
+ * from PSYS, different voltage input would map to different Psys_pmax settings:
+ * For Type-C 15V, the Psys_pmax should be 15v x 6.009A = 90.135W
+ * For Type-C 20V, the Psys_pmax should be 20v x 6.009A = 120.18W
+ * For a barrel jack, the Psys_pmax should be 19v x 6.009A = 114.171W
+ *
+ * Imagine that there is a type-c 100W (20V/5A) connected to DUT w/ full loading,
+ * and the Psys_pmax setting is 120W. Then IMVP9.1 can calculate the current system
+ * power = 120W * 5A / 6.009A = 100W, which is the actual system power.
+ */
+const struct psys_config psys_config = {
+	.efficiency = 97,
+	.psys_imax_ma = 6009,
+	.bj_volts_mv = 19000,
+};
+
+void variant_devtree_update(void)
+{
+	size_t total_entries = ARRAY_SIZE(limits);
+	variant_update_psys_power_limits(limits, sys_limits, total_entries, &psys_config);
+}