linux-kernel - [PATCH v6 3/6] dt-bindings: clock: renesas,rzn1-clocks: document RZ/N1 clock driver

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Date:   Tue, 22 May 2018 11:01:23 +0100
From:   Michel Pollet <michel.pollet@...renesas.com>
To:     linux-renesas-soc@...r.kernel.org,
        Simon Horman <horms@...ge.net.au>
Cc:     phil.edworthy@...esas.com,
        Michel Pollet <buserror+upstream@...il.com>,
        Michel Pollet <michel.pollet@...renesas.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: [PATCH v6 3/6] dt-bindings: clock: renesas,rzn1-clocks: document RZ/N1 clock driver

The Renesas RZ/N1 Family (Part #R9A06G0xx) requires a driver
to provide the SoC clock infrastructure for Linux.

This documents the driver bindings.

Signed-off-by: Michel Pollet <michel.pollet@...renesas.com>
---
 .../bindings/clock/renesas,rzn1-clocks.txt         | 44 ++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/renesas,rzn1-clocks.txt

diff --git a/Documentation/devicetree/bindings/clock/renesas,rzn1-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,rzn1-clocks.txt
new file mode 100644
index 0000000..0c41137
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/renesas,rzn1-clocks.txt
@@ -0,0 +1,44 @@
+* Renesas RZ/N1 Clock Driver
+
+This driver provides the clock infrastructure used by all the other drivers.
+
+One of the 'special' feature of this infrastructure is that Linux doesn't
+necessary 'own' all the clocks on the SoC, some other OS runs on
+the Cortex-M3 core and that OS can access and claim it's own clocks.
+
+Required Properties:
+
+  - compatible: Must be
+    - "renesas,r9a06g032-clocks" for the RZ/N1D
+    and "renesas,rzn1-clocks" as a fallback.
+  - reg: Base address and length of the memory resource used by the driver
+  - #clock-cells: Must be 1
+
+Examples
+--------
+
+  - Clock driver device node:
+
+	clock: clocks@...0c000 {
+		compatible = "renesas,r9a06g032-clocks",
+				"renesas,rzn1-clocks";
+		reg = <0x4000c000 0x1000>;
+		status = "okay";
+		#clock-cells = <1>;
+	};
+
+
+  - Other drivers can use the clocks as in:
+
+	uart0: serial@...60000 {
+		compatible = "snps,dw-apb-uart";
+		reg = <0x40060000 0x400>;
+		interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>;
+		reg-shift = <2>;
+		reg-io-width = <4>;
+		clocks = <&clock RZN1_CLK_UART0>;
+		clock-names = "baudclk";
+	};
+    Note the use of RZN1_CLK_UART0 -- these constants are declared in
+    the rzn1-clocks.h header file. These are not hardware based constants
+    and are Linux specific.
-- 
2.7.4