[PATCH 2/3] dt-bindings: spmi: Add SmartDV SPMI controller

[vamshi gajjela]

From: Vamshi Gajjela <vamshigajjela at google.com>

Document the device tree bindings for the SmartDV IP Solutions MIPI SPMI
master controller ("smartdv,spmi").

This controller IP is integrated in Google Tensor SoCs starting with the
G5 generation (codename: laguna, canonically written as "lga"), so add
"google,lga-spmi" with a fallback to "smartdv,spmi".

Signed-off-by: Vamshi Gajjela <vamshigajjela at google.com>
---
 .../bindings/spmi/smartdv,spmi.yaml           | 126 ++++++++++++++++++
 MAINTAINERS                                   |   6 +
 2 files changed, 132 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spmi/smartdv,spmi.yaml

diff --git a/Documentation/devicetree/bindings/spmi/smartdv,spmi.yaml b/Documentation/devicetree/bindings/spmi/smartdv,spmi.yaml
new file mode 100644
index 000000000000..e0512e60d932
--- /dev/null
+++ b/Documentation/devicetree/bindings/spmi/smartdv,spmi.yaml
@@ -0,0 +1,126 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spmi/smartdv,spmi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SmartDV IP Solutions SPMI Controller
+
+maintainers:
+  - Vamshi Gajjela <vamshigajjela at google.com>
+
+description:
+  SmartDV IP Solutions MIPI System Power Management Interface (SPMI) master
+  controller supporting MIPI SPMI Specification versions 1.0 and 2.0.
+
+allOf:
+  - $ref: spmi.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: google,lga-spmi
+          - const: smartdv,spmi
+      - const: smartdv,spmi
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description:
+      Core clock to the controller from which SPMI SCL is derived. Optional if
+      the controller uses a free-running clock and clock-frequency is specified.
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  clock-frequency:
+    description:
+      Input core clock frequency in Hz when the controller uses a free-running
+      clock not described in clocks.
+
+  smartdv,master-arb-enable:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+    default: 0
+    description:
+      Enable master bus arbitration phase (0 = disable, 1 = enable).
+
+  smartdv,master-id:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 3
+    default: 0
+    description:
+      Master ID for the controller on the SPMI bus.
+
+  smartdv,spmi-version:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+    default: 0
+    description:
+      MIPI SPMI specification version used for transfers (0 for MIPI SPMI v1.0,
+      1 for MIPI SPMI v2.0).
+
+  smartdv,arb-retry-limit:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 255
+    default: 32
+    description:
+      Maximum number of times the master retries a command when losing bus
+      arbitration.
+
+  smartdv,prescaler:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 255
+    default: 0
+    description:
+      Clock divider value to generate SPMI SCL from the input core clock. Writing
+      1 divides the system clock by 2; more generally, a non-zero value n
+      divides the system clock by 2 * n.
+
+  smartdv,read-latency:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 255
+    default: 32
+    description:
+      Number of SPMI SCL clock cycles to pause during bus turnaround on read
+      commands to allow the target device to fetch data.
+
+  smartdv,arb-scl-delay:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 3
+    default: 0
+    description:
+      Delay between arbitration and Sequence Start Condition (SSC) when the
+      controller is the Bus Owner Master (BOM).
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/spmi/spmi.h>
+
+    spmi at 14853000 {
+        compatible = "google,lga-spmi", "smartdv,spmi";
+        reg = <0x14853000 0x100>;
+        #address-cells = <2>;
+        #size-cells = <0>;
+        clock-frequency = <19200000>;
+        smartdv,master-arb-enable = <1>;
+        smartdv,spmi-version = <1>;
+
+        pmic at f {
+            reg = <0xf SPMI_USID>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index eaeb60c1e1c2..f44c597c2075 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -25243,6 +25243,12 @@ T:	git https://github.com/cschaufler/smack-next.git
 F:	Documentation/admin-guide/LSM/Smack.rst
 F:	security/smack/
 
+SMARTDV SPMI CONTROLLER DRIVER
+M:	Vamshi Gajjela <vamshigajjela at google.com>
+L:	linux-kernel at vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/spmi/smartdv,spmi.yaml
+
 SMBDIRECT (RDMA Stream Transport with Read/Write-Offload, MS-SMBD)
 M:	Steve French <smfrench at gmail.com>
 M:	Steve French <sfrench at samba.org>
-- 
2.56.0.317.g454f8302e1-goog