linux-kernel - [PATCH 2/4] dt-bindings: mfd: spacemit,p1: Add individual regulator supply properties

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Message-Id: <20260122-spacemit-p1-v1-2-309be27fbff9@riscstar.com>
Date: Thu, 22 Jan 2026 17:43:43 +0800
From: Guodong Xu <guodong@...cstar.com>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Yixun Lan <dlan@...too.org>, Alex Elder <elder@...cstar.com>, 
 Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Troy Mitchell <troy.mitchell@...ux.spacemit.com>, 
 Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
 Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>
Cc: linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 spacemit@...ts.linux.dev, devicetree@...r.kernel.org, 
 Guodong Xu <guodong@...cstar.com>
Subject: [PATCH 2/4] dt-bindings: mfd: spacemit,p1: Add individual
 regulator supply properties

Add supply properties that match the P1 PMIC's actual hardware topology
where each buck converter has its own VIN pin and LDO groups share
common input pins. Supply names are defined according to the pinout
names in the P1 datasheet.

This allows different boards to describe their actual
power tree connections in devicetree rather than hardcoding supply
relationships in the driver.

Signed-off-by: Guodong Xu <guodong@...cstar.com>
---
 .../devicetree/bindings/mfd/spacemit,p1.yaml       | 58 +++++++++++++++++++++-
 1 file changed, 56 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/spacemit,p1.yaml b/Documentation/devicetree/bindings/mfd/spacemit,p1.yaml
index c6593ac6ef6adb72fc48af570dc13fc9edf77ccb..abdc93b9a67b1872c8fe6955abd950622a0b69e8 100644
--- a/Documentation/devicetree/bindings/mfd/spacemit,p1.yaml
+++ b/Documentation/devicetree/bindings/mfd/spacemit,p1.yaml
@@ -27,8 +27,41 @@ properties:
   interrupts:
     maxItems: 1
 
-  vin-supply:
-    description: Input supply phandle.
+  vin1-supply:
+    description:
+      Power supply for BUCK1. Required if BUCK1 is defined.
+
+  vin2-supply:
+    description:
+      Power supply for BUCK2. Required if BUCK2 is defined.
+
+  vin3-supply:
+    description:
+      Power supply for BUCK3. Required if BUCK3 is defined.
+
+  vin4-supply:
+    description:
+      Power supply for BUCK4. Required if BUCK4 is defined.
+
+  vin5-supply:
+    description:
+      Power supply for BUCK5. Required if BUCK5 is defined.
+
+  vin6-supply:
+    description:
+      Power supply for BUCK6. Required if BUCK6 is defined.
+
+  aldoin-supply:
+    description:
+      Power supply for ALDO1-4. Required if any are defined.
+
+  dldoin1-supply:
+    description:
+      Power supply for DLDO1-4. Required if any are defined.
+
+  dldoin2-supply:
+    description:
+      Power supply for DLDO5-7. Required if any are defined.
 
   regulators:
     type: object
@@ -50,6 +83,15 @@ unevaluatedProperties: false
 
 examples:
   - |
+    / {
+        reg_vcc_5v: regulator-vcc-5v {
+            compatible = "regulator-fixed";
+            regulator-name = "vcc_5v";
+            regulator-min-microvolt = <5000000>;
+            regulator-max-microvolt = <5000000>;
+        };
+    };
+
     i2c {
         #address-cells = <1>;
         #size-cells = <0>;
@@ -58,6 +100,10 @@ examples:
             compatible = "spacemit,p1";
             reg = <0x41>;
             interrupts = <64>;
+            vin1-supply = <&reg_vcc_5v>;
+            vin5-supply = <&reg_vcc_5v>;
+            aldoin-supply = <&reg_vcc_5v>;
+            dldoin1-supply = <&buck5>;
 
             regulators {
                 buck1 {
@@ -68,6 +114,14 @@ examples:
                     regulator-always-on;
                 };
 
+                buck5: buck5 {
+                    regulator-name = "buck5";
+                    regulator-min-microvolt = <500000>;
+                    regulator-max-microvolt = <3450000>;
+                    regulator-ramp-delay = <5000>;
+                    regulator-always-on;
+                };
+
                 aldo1 {
                     regulator-name = "aldo1";
                     regulator-min-microvolt = <500000>;

-- 
2.43.0