clk/axs10x: Add I2S PLL clock driver

The ARC SDP I2S clock can be programmed using a
specific PLL.

This patch has the goal of adding a clock driver
that programs this PLL.

At this moment the rate values are hardcoded in
a table but in the future it would be ideal to
use a function which determines the PLL values
given the desired rate.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/axs10x-i2s-pll-clock.txt b/Documentation/devicetree/bindings/clock/axs10x-i2s-pll-clock.txt
new file mode 100644
index 000000000000..5ffc8df7e6da
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/axs10x-i2s-pll-clock.txt
@@ -0,0 +1,25 @@
+Binding for the AXS10X I2S PLL clock
+
+This binding uses the common clock binding[1].
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Required properties:
+- compatible: shall be "snps,axs10x-i2s-pll-clock"
+- reg : address and length of the I2S PLL register set.
+- clocks: shall be the input parent clock phandle for the PLL.
+- #clock-cells: from common clock binding; Should always be set to 0.
+
+Example:
+	pll_clock: pll_clock {
+		compatible = "fixed-clock";
+		clock-frequency = <27000000>;
+		#clock-cells = <0>;
+	};
+
+	i2s_clock@100a0 {
+		compatible = "snps,axs10x-i2s-pll-clock";
+		reg = <0x100a0 0x10>;
+		clocks = <&pll_clock>;
+		#clock-cells = <0>;
+	};