dt_bindings: mfd: Add ROHM BD71815 PMIC

Document DT bindings for ROHM BD71815.

BD71815 is a single-chip power management IC mainly for battery-powered
portable devices. The IC integrates 5 bucks, 7 LDOs, a boost driver for
LED, a battery charger with a Coulomb counter, a real-time clock, a 32kHz
clock and two general-purpose outputs although only one is documented by
the data-sheet.
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,bd71815-pmic.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/rohm,bd71815-pmic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BD71815 Power Management Integrated Circuit bindings
+
+maintainers:
+  - Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
+
+description: |
+  BD71815AGW is a single-chip power management ICs for battery-powered
+  portable devices. It integrates 5 buck converters, 8 LDOs, a boost driver
+  for LED and a 500 mA single-cell linear charger. Also included is a Coulomb
+  counter, a real-time clock (RTC), and a 32.768 kHz clock gate and two GPOs.
+
+properties:
+  compatible:
+    const: rohm,bd71815
+
+  reg:
+    description:
+      I2C slave address.
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+    description: |
+      The first cell is the pin number and the second cell is used to specify
+      flags. See ../gpio/gpio.txt for more information.
+
+  clocks:
+    maxItems: 1
+
+  "#clock-cells":
+    const: 0
+
+  clock-output-names:
+    const: bd71815-32k-out
+
+  rohm,clkout-open-drain:
+    description: clk32kout mode. Set to 1 for "open-drain" or 0 for "cmos".
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 0
+    maximum: 1
+
+  rohm,charger-sense-resistor-ohms:
+    minimum: 10000000
+    maximum: 50000000
+    description: |
+      BD71827 and BD71828 have SAR ADC for measuring charging currents.
+      External sense resistor (RSENSE in data sheet) should be used. If
+      something other but 30MOhm resistor is used the resistance value
+      should be given here in Ohms.
+    default: 30000000
+
+  regulators:
+    $ref: ../regulator/rohm,bd71815-regulator.yaml
+    description:
+      List of child nodes that specify the regulators.
+
+  gpio-reserved-ranges:
+    description: |
+      Usage of BD71828 GPIO pins can be changed via OTP. This property can be
+      used to mark the pins which should not be configured for GPIO. Please see
+      the ../gpio/gpio.txt for more information.
+
+  rohm,enable-hidden-gpo:
+    description: |
+      The BD71815 has undocumented GPO at pin E5. Pin is marked as GND at the
+      data-sheet as it's location in the middle of GND pins makes it hard to
+      use on PCB. If your board has managed to use this pin you can enable the
+      second GPO by defining this property. Dont enable this if you are unsure
+      about how the E5 pin is connected on your board.
+    type: boolean
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - "#clock-cells"
+  - regulators
+  - gpio-controller
+  - "#gpio-cells"
+
+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@4b {
+            compatible = "rohm,bd71815";
+            reg = <0x4b>;
+
+            interrupt-parent = <&gpio1>;
+            interrupts = <29 IRQ_TYPE_LEVEL_LOW>;
+
+            clocks = <&osc 0>;
+            #clock-cells = <0>;
+            clock-output-names = "bd71815-32k-out";
+
+            gpio-controller;
+            #gpio-cells = <2>;
+
+            rohm,charger-sense-resistor-ohms = <10000000>;
+
+            regulators {
+                buck1: buck1 {
+                    regulator-name = "buck1";
+                    regulator-min-microvolt = <800000>;
+                    regulator-max-microvolt = <2000000>;
+                    regulator-always-on;
+                    regulator-ramp-delay = <1250>;
+                    rohm,dvs-run-voltage = <1150000>;
+                    rohm,dvs-suspend-voltage = <950000>;
+                };
+                buck2: buck2 {
+                    regulator-name = "buck2";
+                    regulator-min-microvolt = <800000>;
+                    regulator-max-microvolt = <2000000>;
+                    regulator-always-on;
+                    regulator-ramp-delay = <1250>;
+                    rohm,dvs-run-voltage = <1150000>;
+                    rohm,dvs-suspend-voltage = <950000>;
+                };
+                buck3: buck3 {
+                    regulator-name = "buck3";
+                    regulator-min-microvolt = <1200000>;
+                    regulator-max-microvolt = <2700000>;
+                    regulator-always-on;
+                };
+                buck4: buck4 {
+                    regulator-name = "buck4";
+                    regulator-min-microvolt = <1100000>;
+                    regulator-max-microvolt = <1850000>;
+                    regulator-always-on;
+                };
+                buck5: buck5 {
+                    regulator-name = "buck5";
+                    regulator-min-microvolt = <1800000>;
+                    regulator-max-microvolt = <3300000>;
+                    regulator-always-on;
+                };
+                ldo1: ldo1 {
+                    regulator-name = "ldo1";
+                    regulator-min-microvolt = <800000>;
+                    regulator-max-microvolt = <3300000>;
+                    regulator-always-on;
+                };
+                ldo2: ldo2 {
+                    regulator-name = "ldo2";
+                    regulator-min-microvolt = <800000>;
+                    regulator-max-microvolt = <3300000>;
+                    regulator-always-on;
+                };
+                ldo3: ldo3 {
+                    regulator-name = "ldo3";
+                    regulator-min-microvolt = <800000>;
+                    regulator-max-microvolt = <3300000>;
+                    regulator-always-on;
+                };
+                ldo4: ldo4 {
+                    regulator-name = "ldo4";
+                    regulator-min-microvolt = <800000>;
+                    regulator-max-microvolt = <3300000>;
+                    regulator-always-on;
+                };
+                ldo5: ldo5 {
+                    regulator-name = "ldo5";
+                    regulator-min-microvolt = <800000>;
+                    regulator-max-microvolt = <3300000>;
+                    regulator-always-on;
+                };
+                ldo6: ldodvref {
+                    regulator-name = "ldodvref";
+                    regulator-always-on;
+                };
+                ldo7: ldolpsr {
+                    regulator-name = "ldolpsr";
+                    regulator-always-on;
+                };
+
+                boost: wled {
+                    regulator-name = "wled";
+                    regulator-min-microamp = <10>;
+                    regulator-max-microamp = <25000>;
+                };
+            };
+        };
+    };