linux-kernel - [PATCH 4/4] dt-bindings: w1: Add schema for Maxim DS1WM

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Date:   Thu, 30 Jun 2022 13:26:51 +0200
From:   Julian Haller <julian.haller@....ms.philips.com>
To:     linux-kernel@...r.kernel.org
Cc:     julian.haller@...lips.com, zbr@...emap.net
Subject: [PATCH 4/4] dt-bindings: w1: Add schema for Maxim DS1WM

From: Julian Haller <julian.haller@...lips.com>

The Maxim DS1WM is a synthesizable 1-Wire Bus Master for usage in
custom ASIC and FPGA designs. The datatsheet can be found under
https://datasheets.maximintegrated.com/en/ds/DS1WM.pdf

Signed-off-by: Julian Haller <julian.haller@...lips.com>
---
 .../devicetree/bindings/w1/maxim,ds1wm.yaml   | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/w1/maxim,ds1wm.yaml

diff --git a/Documentation/devicetree/bindings/w1/maxim,ds1wm.yaml b/Documentation/devicetree/bindings/w1/maxim,ds1wm.yaml
new file mode 100644
index 000000000000..c3f57ff2fdde
--- /dev/null
+++ b/Documentation/devicetree/bindings/w1/maxim,ds1wm.yaml
@@ -0,0 +1,102 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/w1/maxim,ds1wm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim DS1WM One wire bus master controller Binding
+
+maintainers:
+  - Evgeniy Polyakov <zbr@...emap.net>
+
+description: |
+  This document describes bindings which can be used to
+  describe DS1WM devices in a device tree. The DS1WM is a synthesizable 1-Wire
+  Bus Master for usage in custom ASIC and FPGA designs.
+
+  The datatsheet can be found under
+  https://datasheets.maximintegrated.com/en/ds/DS1WM.pdf
+
+properties:
+  $nodename:
+    pattern: "^w1(@.*|-[0-9a-f])*$"
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  compatible:
+    const: maxim,ds1wm
+
+  maxim,clock-rate:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      DS1WM input clock rate.
+
+  maxim,active-high:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      When set, INTR pin is active high. Defaults to active low.
+
+  maxim,register-size:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      DS1WM register size in bytes.
+    oneOf:
+      - enum: [1, 2, 4]
+
+  maxim,reset-recover-delay:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Amount of time to sleep following a reset pulse (in milliseconds). Zero
+      should work if your bus devices recover time respects the 1-wire spec
+      since the ds1wm implements the precise timings of a reset pulse/presence
+      detect sequence.
+
+  maxim,big-endian:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Set if DS1WM hardware is of type big-endian. Defaults to little-endian.
+
+  maxim,strong-pullup-enable:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Enables the strong pull-up output enable (STPZ) pin’s functionality which
+      allows an external strong pull-up any time the master is not pulling the
+      line low or waiting to read a value from a slave device. This
+      functionality is used for meeting the recovery time requirement in
+      Overdrive mode and long-line standard communications.
+
+  maxim,strong-pullup-supply:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Enables the STPZ output while the master is in an IDLE state. This will
+      provide a stiff supply to devices requiring high current during
+      operations. Requires maxim,strong-pullup-enable.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - maxim,register-size
+  - maxim,reset-recover-delay
+  - maxim,clock-rate
+
+additionalProperties: false
+
+examples:
+  - |
+    w1@...0 {
+        compatible = "maxim,ds1wm";
+        reg = <0x4200 0x24>;
+        interrupts = <10>;
+        maxim,register-size = <4>;
+        maxim,reset-recover-delay = <2>;
+        maxim,clock-rate = <100000000>;
+        maxim,strong-pullup;
+        maxim,big-endian;
+        maxim,active-high;
+    };
+...
-- 
2.25.1