clk: shmobile: r8a7779: Add clocks support

The R8A7779 SoC has several clocks that are too custom to be supported in a
generic driver. Those clocks are all fixed rate clocks with multiplier and
divisor set according to boot mode configuration.

Based on work for R-Car Gen2 SoCs by Laurent Pinchart.

Cc: devicetree@vger.kernel.org
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
(cherry picked from commit 7b42a997bfb93c6ae0709f34ec8e2860757804b5)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 27 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/renesas,r8a7779-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,r8a7779-cpg-clocks.txt
new file mode 100644
index 000000000000..ed3c8cb12f4e
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/renesas,r8a7779-cpg-clocks.txt
@@ -0,0 +1,27 @@
+* Renesas R8A7779 Clock Pulse Generator (CPG)
+
+The CPG generates core clocks for the R8A7779. It includes one PLL and
+several fixed ratio dividers
+
+Required Properties:
+
+  - compatible: Must be "renesas,r8a7779-cpg-clocks"
+  - reg: Base address and length of the memory resource used by the CPG
+
+  - clocks: Reference to the parent clock
+  - #clock-cells: Must be 1
+  - clock-output-names: The names of the clocks. Supported clocks are "plla",
+    "z", "zs", "s", "s1", "p", "b", "out".
+
+
+Example
+-------
+
+	cpg_clocks: cpg_clocks@ffc80000 {
+		compatible = "renesas,r8a7779-cpg-clocks";
+		reg = <0 0xffc80000 0 0x30>;
+		clocks = <&extal_clk>;
+		#clock-cells = <1>;
+		clock-output-names = "plla", "z", "zs", "s", "s1", "p",
+		                     "b", "out";
+	};