linux-kernel - [PATCH 1/2] dt-bindings: pwm: Add Xilinx AXI Timer

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Message-Id: <20210503214413.3145015-1-sean.anderson@seco.com>
Date:   Mon,  3 May 2021 17:44:12 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     linux-pwm@...r.kernel.org, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        michal.simek@...inx.com, Sean Anderson <sean.anderson@...o.com>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH 1/2] dt-bindings: pwm: Add Xilinx AXI Timer

This adds a binding for the Xilinx LogiCORE IP AXI Timer. This device is
a "soft" block, so it has many parameters which would not be
configurable in most hardware. This binding is usually automatically
generated by Xilinx's tools, so the names and values of properties
must be kept as they are.

Signed-off-by: Sean Anderson <sean.anderson@...o.com>
---

 .../bindings/pwm/xlnx,axi-timer.yaml          | 91 +++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/xlnx,axi-timer.yaml

diff --git a/Documentation/devicetree/bindings/pwm/xlnx,axi-timer.yaml b/Documentation/devicetree/bindings/pwm/xlnx,axi-timer.yaml
new file mode 100644
index 000000000000..3a0abd940336
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/xlnx,axi-timer.yaml
@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/xlnx,axi-timer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx LogiCORE IP AXI Timer Device Tree Binding
+
+maintainers:
+  - Sean Anderson <sean.anderson@...o.com>
+
+properties:
+  compatible:
+    items:
+      - const: xlnx,axi-timer-2.0
+      - const: xlnx,xps-timer-1.00.a
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: s_axi_aclk
+
+  reg:
+    maxItems: 1
+
+  xlnx,count-width:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 8
+    maximum: 32
+    description:
+      The width of the counters, in bits.
+
+  xlnx,gen0-assert:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+    description:
+      The polarity of the generateout0 signal. 0 for active-low, 1 for active-high.
+
+  xlnx,gen1-assert:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+    description:
+      The polarity of the generateout1 signal. 0 for active-low, 1 for active-high.
+
+  xlnx,one-timer-only:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+    description:
+      Whether only one timer is present in this block.
+
+  xlnx,trig0-assert:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+    description:
+      The polarity of the capturetrig0 signal. 0 for active-low, 1 for active-high.
+
+  xlnx,trig1-assert:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+    description:
+      The polarity of the capturetrig1 signal. 0 for active-low, 1 for active-high.
+
+required:
+  - compatible
+  - clocks
+  - reg
+  - xlnx,count-width
+  - xlnx,gen0-assert
+  - xlnx,gen1-assert
+  - xlnx,one-timer-only
+  - xlnx,trig0-assert
+  - xlnx,trig1-assert
+
+additionalProperties: true
+
+examples:
+  - |
+    axi_timer_0: timer@...e0000 {
+        clock-frequency = <99999001>;
+        clock-names = "s_axi_aclk";
+        clocks = <&zynqmp_clk 71>;
+        compatible = "xlnx,axi-timer-2.0", "xlnx,xps-timer-1.00.a";
+        reg = <0x0 0x800e0000 0x0 0x10000>;
+        xlnx,count-width = <0x20>;
+        xlnx,gen0-assert = <0x1>;
+        xlnx,gen1-assert = <0x1>;
+        xlnx,one-timer-only = <0x0>;
+        xlnx,trig0-assert = <0x1>;
+        xlnx,trig1-assert = <0x1>;
+    };
-- 
2.25.1