linux-kernel - [PATCH v2 03/18] dt-bindings: clk: Add documentation of grx500 clock controller

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Message-Id: <20180803030237.3366-4-songjun.wu@linux.intel.com>
Date:   Fri,  3 Aug 2018 11:02:22 +0800
From:   Songjun Wu <songjun.wu@...ux.intel.com>
To:     hua.ma@...ux.intel.com, yixin.zhu@...ux.intel.com,
        chuanhua.lei@...ux.intel.com, qi-ming.wu@...el.com
Cc:     linux-mips@...ux-mips.org, linux-clk@...r.kernel.org,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        Songjun Wu <songjun.wu@...ux.intel.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH v2 03/18] dt-bindings: clk: Add documentation of grx500 clock controller

From: Yixin Zhu <yixin.zhu@...ux.intel.com>

This patch adds binding documentation for grx500 clock controller.

Signed-off-by: YiXin Zhu <yixin.zhu@...ux.intel.com>
Signed-off-by: Songjun Wu <songjun.wu@...ux.intel.com>
---

Changes in v2:
- Rewrite clock driver's dt-binding document according to Rob Herring's
  comments.
- Simplify device tree docoment, remove some clock description.

 .../devicetree/bindings/clock/intel,grx500-clk.txt | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/intel,grx500-clk.txt

diff --git a/Documentation/devicetree/bindings/clock/intel,grx500-clk.txt b/Documentation/devicetree/bindings/clock/intel,grx500-clk.txt
new file mode 100644
index 000000000000..e54e1dad9196
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/intel,grx500-clk.txt
@@ -0,0 +1,39 @@
+Device Tree Clock bindings for grx500 PLL controller.
+
+This binding uses the common clock binding:
+	Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The grx500 clock controller supplies clock to various controllers within the
+SoC.
+
+Required properties for clock node
+- compatible: Should be "intel,grx500-cgu".
+- reg: physical base address of the controller and length of memory range.
+- #clock-cells: should be 1.
+
+Optional Propteries:
+- intel,osc-frequency: frequency of the osc clock.
+if missing, driver will use clock rate defined in the driver.
+
+Example: Clock controller node:
+
+	cgu: cgu@...00000 {
+                compatible = "intel,grx500-cgu", "syscon";
+		reg = <0x16200000 0x200>;
+		#clock-cells = <1>;
+	};
+
+
+Example: UART controller node that consumes the clock generated by clock
+	controller.
+
+	asc0: serial@...00000 {
+		compatible = "lantiq,asc";
+		reg = <0x16600000 0x100000>;
+		interrupt-parent = <&gic>;
+		interrupts = <GIC_SHARED 103 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SHARED 105 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SHARED 106 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cgu CLK_SSX4>, <&cgu GCLK_UART>;
+		clock-names = "freq", "asc";
+	};
-- 
2.11.0