linux-kernel - [PATCH v5 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock

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Message-Id: <20210809145329.24177-4-pali@kernel.org>
Date:   Mon,  9 Aug 2021 16:53:26 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Vladimir Vid <vladimir.vid@...tura.hr>,
        Marek Behún <kabel@...nel.org>,
        linux-clk@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v5 3/6] dt-bindings: mvebu-uart: document DT bindings for marvell,armada-3700-uart-clock

This change adds DT bindings documentation for device nodes with compatible
string "marvell,armada-3700-uart-clock".

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 .../bindings/clock/armada3700-uart-clock.yaml | 57 +++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/armada3700-uart-clock.yaml

diff --git a/Documentation/devicetree/bindings/clock/armada3700-uart-clock.yaml b/Documentation/devicetree/bindings/clock/armada3700-uart-clock.yaml
new file mode 100644
index 000000000000..5bdb23e0ba3e
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/armada3700-uart-clock.yaml
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/marvell,armada-3700-uart-clock#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+title: Marvell Armada 3720 UART clocks
+
+properties:
+  compatible:
+    const: marvell,armada-3700-uart-clock
+
+  reg:
+    items:
+      - description: UART Clock Control Register
+      - description: UART 2 Baud Rate Divisor Register
+
+  clocks:
+    description: |
+      List of parent clocks suitable for UART from following set:
+        "TBG-A-P", "TBG-B-P", "TBG-A-S", "TBG-B-S", "xtal"
+      UART clock can use one from this set and when more are provided
+      then kernel would choose and configure the most suitable one.
+      It is suggest to specify at least one TBG clock to achieve
+      baudrates above 230400 and also to specify clock which bootloader
+      used for UART (most probably xtal) for smooth boot log on UART.
+
+  clock-names:
+    items:
+      - const: TBG-A-P
+      - const: TBG-B-P
+      - const: TBG-A-S
+      - const: TBG-B-S
+      - const: xtal
+    minItems: 1
+    maxItems: 5
+
+  '#clock-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    uartclk: uartclk@...00 {
+      compatible = "marvell,armada-3700-uart-clock";
+      reg = <0x12010 0x4>, <0x12210 0x4>;
+      clocks = <&tbg 0>, <&tbg 1>, <&tbg 2>, <&tbg 3>, <&xtalclk>;
+      clock-names = "TBG-A-P", "TBG-B-P", "TBG-A-S", "TBG-B-S", "xtal";
+      #clock-cells = <1>;
+    };
-- 
2.20.1