[PATCH] dt-bindings: mfd: add Broadcom's MISC block

[Rafał Miłecki <zajec5@xxxxxxxxx>]

From: Rafał Miłecki <rafal@xxxxxxxxxx>

Broadcom's MISC is an MFD hardware block used on some of their SoCs like
bcm63xx and bcm4908. At this point only PCIe reset is fully understood
and documented. More functions may be added later.

Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
---
Broadcom's BCM4908 struct with MISC block registers:

typedef struct Misc {
   uint32 miscStrapBus; /* 0x00 */
   uint32 miscStrapOverride;     /* 0x04 */
   uint32 miscSoftwareDebug[6];  /* 0x08 */
   uint32 miscWDResetCtrl;       /* 0x20 */
   uint32 miscSoftwareDebugNW[2];/* 0x24 */
   uint32 miscSoftResetB;        /* 0x2c */
   uint32 miscQAMPllStatus;      /* 0x30 */
   uint32 miscRsvd1;             /* 0x34 */
   uint32 miscSpiMasterCtrl;     /* 0x38 */
   uint32 miscAltBootVector;     /* 0x3c */
   uint32 miscPeriphCtrl;        /* 0x40 */
   uint32 miscPCIECtrl;          /* 0x44 */
   uint32 miscAdsl_clock_sample; /* 0x48 */
   uint32 miscRngCtrl;           /* 0x4c */
   uint32 miscMbox_data[4];      /* 0x50 */
   uint32 miscMbox_ctrl;         /* 0x60 */
   uint32 miscxMIIPadCtrl[4];    /* 0x64 */
   uint32 miscxMIIPullCtrl[4];    /* 0x74 */
   uint32 miscWDResetEn;          /* 0x84 */
   uint32 miscBootOverlayEn;      /* 0x88 */
   uint32 miscSGMIIFiberDetect;   /* 0x8c */
   uint32 miscUniMacCtrl;         /* 0x90 */
   uint32 miscMaskUBUSErr;        /* 0x94 */
   uint32 miscTOSsync;            /* 0x98 */
   uint32 miscPM0_1_status;       /* 0x9c */
   uint32 miscPM2_3_status;       /* 0xa0 */
   uint32 miscSGB_status;         /* 0xa4 */
   uint32 miscPM0_1_config;       /* 0xa8 */
   uint32 miscPM2_3_config;       /* 0xac */
   uint32 miscSGB_config;         /* 0xb0 */
   uint32 miscPM0_1_tmon_config;  /* 0xb4 */
   uint32 miscPM2_3_tmon_config;  /* 0xb8 */
   uint32 miscSGB_tmon_config;    /* 0xbc */
   uint32 miscMDIOmasterSelect;   /* 0xc0 */
   uint32 miscUSIMCtrl;           /* 0xc4 */
   uint32 miscUSIMPadCtrl;        /* 0xc8 */
   uint32 miscPerSpareReg[3];     /* 0xcc - 0xd4 */
   uint32 miscDgSensePadCtrl;     /* 0xd8 */
   uint32 miscPeriphMiscCtrl;     /* 0xdc */
   uint32 miscPeriphMiscStat;     /* 0xe0 */
} Misc;
---
 .../devicetree/bindings/mfd/brcm,misc.yaml    | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/brcm,misc.yaml

diff --git a/Documentation/devicetree/bindings/mfd/brcm,misc.yaml b/Documentation/devicetree/bindings/mfd/brcm,misc.yaml
new file mode 100644
index 000000000000..cff7d772a7db
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/brcm,misc.yaml
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/brcm,misc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom's MISC block
+
+maintainers:
+  - Rafał Miłecki <rafal@xxxxxxxxxx>
+
+description: |
+  Broadcom's MISC is a hardware block used on some SoCs (e.g. bcm63xx and
+  bcm4908). It's used to implement some simple functions like a watchdog, PCIe
+  reset, UniMAC control and more.
+
+properties:
+  compatible:
+    items:
+      - const: brcm,misc
+      - const: simple-mfd
+
+  reg:
+    description: MISC block registers
+
+  ranges: true
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+patternProperties:
+  '^reset-controller@[a-f0-9]+$':
+    $ref: ../reset/brcm,bcm4908-misc-pcie-reset.yaml
+
+additionalProperties: false
+
+required:
+  - reg
+  - '#address-cells'
+  - '#size-cells'
+
+examples:
+  - |
+    misc@ff802600 {
+        compatible = "brcm,misc", "simple-mfd";
+        reg = <0xff802600 0xe4>;
+
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0x0 0x0 0xe4>;
+
+        reset-controller@44 {
+            compatible = "brcm,bcm4908-misc-pcie-reset";
+            reg = <0x44 0x4>;
+            #reset-cells = <1>;
+        };
+    };
-- 
2.26.2