linux-kernel - [PATCH v1 1/2] dt-binding: clock: document NPCM7xx clock DT bindings

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Message-Id: <1517818975-11427-2-git-send-email-tmaimon77@gmail.com>
Date:   Mon,  5 Feb 2018 10:22:54 +0200
From:   Tomer Maimon <tmaimon77@...il.com>
To:     mturquette@...libre.com, sboyd@...eaurora.org, robh+dt@...nel.org,
        mark.rutland@....com, tali.perry1@...il.com,
        avifishman70@...il.com, brendanhiggins@...gle.com, joel@....id.au
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, openbmc@...ts.ozlabs.org,
        Tomer Maimon <tmaimon77@...il.com>
Subject: [PATCH v1 1/2] dt-binding: clock: document NPCM7xx clock DT bindings

Added device tree binding documentation for Nuvoton NPCM7xx clocks.

Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
---
 .../bindings/clock/nuvoton,npcm7xx-clk.txt         | 84 ++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/nuvoton,npcm7xx-clk.txt

diff --git a/Documentation/devicetree/bindings/clock/nuvoton,npcm7xx-clk.txt b/Documentation/devicetree/bindings/clock/nuvoton,npcm7xx-clk.txt
new file mode 100644
index 000000000000..1ba1945d3616
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/nuvoton,npcm7xx-clk.txt
@@ -0,0 +1,84 @@
+* Nuvoton NPCM7XX Clock Controller
+
+Nuvoton Poleg BMC NPCM7XX contain integrated clock
+controller, which generates and supplies clock to all modules within the BMC.
+
+Required Properties:
+
+- compatible: should be one of following:
+	- "nuvoton,npcm750-clk" : for clock controller of Nuvoton
+	  Poleg BMC NPCM750
+
+- reg: physical base address of the controller and length of memory mapped
+  region.
+
+
+- #clock-cells: should be 1.
+
+All available clocks are defined as preprocessor macros in
+dt-bindings/clock/nuvoton,npcm7xx-clock.h header and can beused in device tree
+sources.
+
+External clocks:
+
+There are several clocks that are generated outside the BMC. All clocks are of
+a known fixed value that cannot be chagned. Therefor these values are hard coded
+inside the driver and registered on init.
+
+The clock modules contains 4 PLL, 20 dividers and 11 muxes. All these settings
+are set before Linux boot and are not to be altered by the Linux. This driver is
+used only to read the values clocks, not to set them.
+
+In addition to the clock driver, there are 3 external clocks suppling the
+network, which are of fixed values, set on on the device tree, but not used by
+ the clock module. Example can be found below.
+
+Example: Clock controller node:
+
+	clk: clock-controller@...01000 {
+		compatible = "nuvoton,npcm750-clk";
+		#clock-cells = <1>;
+		clock-controller;
+		reg = <0xf0801000 0x1000>;
+		status = "okay";
+	};
+
+Example: Required external clocks for network:
+
+		/* external clock signal rg1refck, supplied by the phy */
+		clk_rg1refck: clk_rg1refck {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <125000000>;
+			clock-output-names = "clk_rg1refck";
+		};
+
+		/* external clock signal rg2refck, supplied by the phy */
+		clk_rg2refck: clk_rg2refck {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <125000000>;
+			clock-output-names = "clk_rg2refck";
+		};
+
+		clk_xin: clk_xin {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <50000000>;
+			clock-output-names = "clk_xin";
+		};
+
+Example: UART controller node that consumes the clock generated by the clock
+  controller (refer to the standard clock bindings for information about
+  "clocks" and "clock-names" properties):
+
+	uart0: serial@...00000 {
+		compatible = "Nuvoton,s5pv210-uart";
+		reg = <0xe2900000 0x400>;
+		interrupt-parent = <&vic1>;
+		interrupts = <10>;
+		clock-names = "uart", "clk_uart_baud0",
+				"clk_uart_baud1";
+		clocks = <&clocks UART0>, <&clocks UART0>,
+				<&clocks SCLK_UART0>;
+	};
-- 
2.14.1