arm64: dts: imx8mn: Enable Overdrive mode

The i.MX8M Nano supports and overdrive mode if the SoC is given
the proper voltage.  Add imx8mn-overdrive.dtsi file which can
be included by boards who support the voltage necessary to handle
the faster clocks.  This increases the GPU clocks from 400MHz to
600MHz.

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-overdrive.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-overdrive.dtsi
new file mode 100644 (file)
index 0000000..5d03fb8
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mn-overdrive.dtsi
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+&gpu {
+       assigned-clocks = <&clk IMX8MN_CLK_GPU_CORE>,
+                         <&clk IMX8MN_CLK_GPU_SHADER>,
+                         <&clk IMX8MN_CLK_GPU_AXI>,
+                         <&clk IMX8MN_CLK_GPU_AHB>,
+                         <&clk IMX8MN_GPU_PLL>;
+       assigned-clock-parents = <&clk IMX8MN_GPU_PLL_OUT>,
+                                 <&clk IMX8MN_GPU_PLL_OUT>,
+                                 <&clk IMX8MN_SYS_PLL1_800M>,
+                                 <&clk IMX8MN_SYS_PLL1_800M>;
+       assigned-clock-rates = <600000000>,
+                              <600000000>,
+                              <800000000>,
+                              <400000000>,
+                              <1200000000>;
+};