[PATCH v3 02/14] dt-bindings: mfd: Add ROHM BD96802 PMIC

Matti Vaittinen
2025-04-08T08:41:04Z

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BD96802Qxx-C is an automotive grade configurable Power Management
Integrated Circuit supporting Functional Safety features for application
processors, SoCs and FPGAs. BD96802 is controlled via I2C, provides two
interrupt lines and has two controllable buck regulators.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>

---
Revision history:
v2 => v3:
- Drop the description of 'reg'
- Fix the buck node names in the example (to lowercase)
v1 => v2:
- No changes
---
.../bindings/mfd/rohm,bd96802-pmic.yaml | 98 +++++++++++++++++++
1 file changed, 98 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/rohm,bd96802-pmic.yaml

diff --git a/Documentation/devicetree/bindings/mfd/rohm,bd96802-pmic.yaml b/Documentation/devicetree/bindings/mfd/rohm,bd96802-pmic.yaml
new file mode 100644
index 000000000000..ccabbebf9a29
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/rohm,bd96802-pmic.yaml
@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/rohm,bd96802-pmic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BD96802 Scalable Power Management Integrated Circuit
+
+maintainers:
+ - Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
+
+description: |
+ BD96802Qxx-C is an automotive grade configurable Power Management
+ Integrated Circuit supporting Functional Safety features for application
+ processors, SoCs and FPGAs
+
+properties:
+ compatible:
+ const: rohm,bd96802
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ description:
+ The PMIC provides intb and errb IRQ lines. The errb IRQ line is used
+ for fatal IRQs which will cause the PMIC to shut down power outputs.
+ In many systems this will shut down the SoC contolling the PMIC and
+ connecting/handling the errb can be omitted. However, there are cases
+ where the SoC is not powered by the PMIC. In that case it may be
+ useful to connect the errb and handle errb events.
+ minItems: 1
+ maxItems: 2
+
+ interrupt-names:
+ minItems: 1
+ items:
+ - enum: [intb, errb]
+ - const: errb
+
+ regulators:
+ $ref: ../regulator/rohm,bd96802-regulator.yaml
+ description:
+ List of child nodes that specify the regulators.
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - interrupt-names
+ - regulators
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+ #include <dt-bindings/leds/common.h>
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ pmic: pmic@62 {
+ reg = <0x62>;
+ compatible = "rohm,bd96802";
+ interrupt-parent = <&gpio1>;
+ interrupts = <29 IRQ_TYPE_LEVEL_LOW>, <6 IRQ_TYPE_LEVEL_LOW>;
+ interrupt-names = "intb", "errb";
+
+ regulators {
+ buck1 {
+ regulator-name = "buck1";
+ regulator-ramp-delay = <1250>;
+ /* 0.5V min INITIAL - 150 mV tune */
+ regulator-min-microvolt = <350000>;
+ /* 3.3V + 150mV tune */
+ regulator-max-microvolt = <3450000>;
+
+ /* These can be set only when PMIC is in STBY */
+ rohm,initial-voltage-microvolt = <500000>;
+ regulator-ov-error-microvolt = <230000>;
+ regulator-uv-error-microvolt = <230000>;
+ regulator-temp-protection-kelvin = <1>;
+ regulator-temp-warn-kelvin = <0>;
+ };
+ buck2 {
+ regulator-name = "buck2";
+ regulator-min-microvolt = <350000>;
+ regulator-max-microvolt = <3450000>;
+
+ rohm,initial-voltage-microvolt = <3000000>;
+ regulator-ov-error-microvolt = <18000>;
+ regulator-uv-error-microvolt = <18000>;
+ regulator-temp-protection-kelvin = <1>;
+ regulator-temp-warn-kelvin = <1>;
+ };
+ };
+ };
+ };
--
2.49.0