ARC: [dts] Add clk feeding into timers to DTs

This allows us to introduce timers in DT in next commit

The core clk frequency hack in AXS103 platform is also extended,
where the core clk feeding into timers is updated in-place in FDT.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>

arch/arc/boot/dts/axc001.dtsi

@@ -26,6 +26,12 @@
 
 		ranges = <0x00000000 0xf0000000 0x10000000>;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <750000000>;
+		};
+
 		core_intc: arc700-intc@cpu {
 			compatible = "snps,arc700-intc";
 			interrupt-controller;

arch/arc/boot/dts/axc003.dtsi

@@ -25,6 +25,12 @@
 
 		ranges = <0x00000000 0xf0000000 0x10000000>;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <90000000>;
+		};
+
 		core_intc: archs-intc@cpu {
 			compatible = "snps,archs-intc";
 			interrupt-controller;

arch/arc/boot/dts/axc003_idu.dtsi

@@ -25,6 +25,12 @@
 
 		ranges = <0x00000000 0xf0000000 0x10000000>;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <90000000>;
+		};
+
 		core_intc: archs-intc@cpu {
 			compatible = "snps,archs-intc";
 			interrupt-controller;

arch/arc/boot/dts/nsim_700.dts

@@ -32,6 +32,12 @@
 		/* child and parent address space 1:1 mapped */
 		ranges;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <80000000>;
+		};
+
 		core_intc: interrupt-controller {
 			compatible = "snps,arc700-intc";
 			interrupt-controller;

arch/arc/boot/dts/nsim_hs.dts

@@ -39,6 +39,12 @@
 			 bus addr,   parent bus addr, size */
 		ranges = <0x80000000 0x0 0x80000000 0x80000000>;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <80000000>;
+		};
+
 		core_intc: core-interrupt-controller {
 			compatible = "snps,archs-intc";
 			interrupt-controller;

arch/arc/boot/dts/nsim_hs_idu.dts

@@ -29,6 +29,12 @@
 		/* child and parent address space 1:1 mapped */
 		ranges;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <80000000>;
+		};
+
 		core_intc: core-interrupt-controller {
 			compatible = "snps,archs-intc";
 			interrupt-controller;

arch/arc/boot/dts/nsimosci.dts

@@ -35,6 +35,12 @@
 		/* child and parent address space 1:1 mapped */
 		ranges;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <20000000>;
+		};
+
 		core_intc: interrupt-controller {
 			compatible = "snps,arc700-intc";
 			interrupt-controller;

arch/arc/boot/dts/nsimosci_hs.dts

@@ -35,6 +35,12 @@
 		/* child and parent address space 1:1 mapped */
 		ranges;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <20000000>;
+		};
+
 		core_intc: core-interrupt-controller {
 			compatible = "snps,archs-intc";
 			interrupt-controller;

arch/arc/boot/dts/nsimosci_hs_idu.dts

@@ -33,6 +33,12 @@
 		/* child and parent address space 1:1 mapped */
 		ranges;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <5000000>;
+		};
+
 		core_intc: core-interrupt-controller {
 			compatible = "snps,archs-intc";
 			interrupt-controller;

arch/arc/boot/dts/vdk_axc003.dtsi

@@ -25,6 +25,12 @@
 
 		ranges = <0x00000000 0xf0000000 0x10000000>;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <50000000>;
+		};
+
 		core_intc: archs-intc@cpu {
 			compatible = "snps,archs-intc";
 			interrupt-controller;

arch/arc/boot/dts/vdk_axc003_idu.dtsi

@@ -26,6 +26,12 @@
 
 		ranges = <0x00000000 0xf0000000 0x10000000>;
 
+		core_clk: core_clk {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <50000000>;
+		};
+
 		core_intc: archs-intc@cpu {
 			compatible = "snps,archs-intc";
 			interrupt-controller;

arch/arc/plat-axs10x/axs10x.c

@@ -14,7 +14,9 @@
  *
  */
 
+#include <linux/of_fdt.h>
 #include <linux/of_platform.h>
+#include <linux/libfdt.h>
 
 #include <asm/asm-offsets.h>
 #include <asm/clk.h>
@@ -389,7 +391,12 @@ axs103_set_freq(unsigned int id, unsigned int fd, unsigned int od)
 
 static void __init axs103_early_init(void)
 {
-	u32 freq = arc_get_core_freq(), orig = freq;
+	int offset = fdt_path_offset(initial_boot_params, "/cpu_card/core_clk");
+	const struct fdt_property *prop = fdt_get_property(initial_boot_params,
+							   offset,
+							   "clock-frequency",
+							   NULL);
+	u32 freq = be32_to_cpu(*(u32*)(prop->data)) / 1000000, orig = freq;
 
 	/*
 	 * AXS103 configurations for SMP/QUAD configurations share device tree
@@ -438,8 +445,13 @@ static void __init axs103_early_init(void)
 	}
 
 	pr_info("Freq is %dMHz\n", freq);
+
+	/* Patching .dtb in-place with new core clock value */
 	if (freq != orig ) {
 		arc_set_core_freq(freq * 1000000);
+		freq = cpu_to_be32(freq * 1000000);
+		fdt_setprop_inplace(initial_boot_params, offset,
+				    "clock-frequency", &freq, sizeof(freq));
 	}
 
 	/* Memory maps already config in pre-bootloader */