dt_bindings: mfd: Add ROHM BD9576MUF and BD9573MUF PMICs

Add bindings for ROHM BD9576MUF and BD9573MUF PMICs. These
PMICs are primarily intended to be used to power the R-Car series
processors. They provide 6 power outputs, safety features and a
watchdog with two functional modes.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

Documentation/devicetree/bindings/mfd/rohm,bd9576-pmic.yaml

@@ -0,0 +1,123 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/rohm,bd9576-pmic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BD9576MUF and BD9573MUF Power Management Integrated Circuit bindings
+
+maintainers:
+  - Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
+
+description: |
+  BD9576MUF and BD9573MUF are power management ICs primarily intended for
+  powering the R-Car series processors.
+  The IC provides 6 power outputs with configurable sequencing and safety
+  monitoring. A watchdog logic with slow ping/windowed modes is also included.
+
+properties:
+  compatible:
+    enum:
+      - rohm,bd9576
+      - rohm,bd9573
+
+  reg:
+    description:
+      I2C slave address.
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  rohm,vout1-en-low:
+    description:
+      BD9576 and BD9573 VOUT1 regulator enable state can be individually
+      controlled by a GPIO. This is dictated by state of vout1-en pin during
+      the PMIC startup. If vout1-en is LOW during PMIC startup then the VOUT1
+      enable sate is controlled via this pin. Set this property if vout1-en
+      is wired to be down at PMIC start-up.
+    type: boolean
+
+  rohm,vout1-en-gpios:
+    description:
+      GPIO specifier to specify the GPIO connected to vout1-en for vout1 ON/OFF
+      state control.
+    maxItems: 1
+
+  rohm,ddr-sel-low:
+    description:
+      The BD9576 and BD9573 output voltage for DDR can be selected by setting
+      the ddr-sel pin low or high. Set this property if ddr-sel is grounded.
+    type: boolean
+
+  rohm,watchdog-enable-gpios:
+    description: The GPIO line used to enable the watchdog.
+    maxItems: 1
+
+  rohm,watchdog-ping-gpios:
+    description: The GPIO line used to ping the watchdog.
+    maxItems: 1
+
+  rohm,hw-timeout-ms:
+    maxItems: 2
+    description:
+      Watchog timeout in milliseconds. If single value is given it is
+      the maximum timeout. Eg. if pinging watchdog is not done within this time
+      limit the watchdog will be triggered. If two values are given watchdog
+      is configured in "window mode". Then first value is limit for short-ping
+      Eg. if watchdog is pinged sooner than that the watchdog will trigger.
+      When two values is given the second value is the maximum timeout.
+      # (HW) minimum for short timeout is 2ms, maximum 220 ms.
+      # (HW) minimum for max timeout is 4ms, maximum 4416 ms.
+
+  regulators:
+    $ref: ../regulator/rohm,bd9576-regulator.yaml
+    description:
+      List of child nodes that specify the regulators.
+
+required:
+  - compatible
+  - reg
+  - regulators
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/leds/common.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        pmic: pmic@30 {
+            compatible = "rohm,bd9576";
+            reg = <0x30>;
+            rohm,vout1-en-low;
+            rohm,vout1-en-gpios = <&gpio2 6 GPIO_ACTIVE_HIGH>;
+            rohm,ddr-sel-low;
+            rohm,watchdog-enable-gpios = <&gpio2 6 GPIO_ACTIVE_HIGH>;
+            rohm,watchdog-ping-gpios = <&gpio2 7 GPIO_ACTIVE_HIGH>;
+            rohm,hw-timeout-ms = <150>, <2300>;
+
+            regulators {
+                boost1: regulator-vd50 {
+                    regulator-name = "VD50";
+                };
+                buck1: regulator-vd18 {
+                    regulator-name = "VD18";
+                };
+                buck2: regulator-vdddr {
+                    regulator-name = "VDDDR";
+                };
+                buck3: regulator-vd10 {
+                    regulator-name = "VD10";
+                };
+                ldo: regulator-voutl1 {
+                    regulator-name = "VOUTL1";
+                };
+                sw: regulator-vouts1 {
+                    regulator-name = "VOUTS1";
+                };
+            };
+        };
+    };