linux-kernel - [PATCH v2 1/2] dt-bindings: clock: document the fsl-sai driver

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Date:   Tue, 10 Dec 2019 00:33:04 +0100
From:   Michael Walle <michael@...le.cc>
To:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH v2 1/2] dt-bindings: clock: document the fsl-sai driver

Signed-off-by: Michael Walle <michael@...le.cc>
---
changes since v1:
 - dual license gpl-2.0-only and bsd-2-clause
 - add "additionalProperties: false"
 - wrap example in soc {} node with correct #address-cells and #size-cells

 .../bindings/clock/fsl,sai-clock.yaml         | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/fsl,sai-clock.yaml

diff --git a/Documentation/devicetree/bindings/clock/fsl,sai-clock.yaml b/Documentation/devicetree/bindings/clock/fsl,sai-clock.yaml
new file mode 100644
index 000000000000..8fb2060ac47f
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/fsl,sai-clock.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bindings/clock/fsl,sai-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale SAI bitclock-as-a-clock binding
+
+maintainers:
+  - Michael Walle <michael@...le.cc>
+
+description: |
+  It is possible to use the BCLK pin of a SAI module as a generic clock
+  output. Some SoC are very constrained in their pin multiplexer
+  configuration. Eg. pins can only be changed groups. For example, on the
+  LS1028A SoC you can only enable SAIs in pairs. If you use only one SAI,
+  the second pins are wasted. Using this binding it is possible to use the
+  clock of the second SAI as a MCLK clock for an audio codec, for example.
+
+  This is a composite of a gated clock and a divider clock.
+
+properties:
+  compatible:
+    const: fsl,vf610-sai-clock
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  '#clock-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        mclk: clock-mclk@...0080 {
+            compatible = "fsl,vf610-sai-clock";
+            reg = <0x0 0xf130080 0x0 0x80>;
+            #clock-cells = <0>;
+            clocks = <&parentclk>;
+        };
+    };
-- 
2.20.1