avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/arch/arm/cpu/armv7/bcm235xx/clk-bsc.c

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/arch/sysmap.h>
+#include <asm/kona-common/clk.h>
+#include "clk-core.h"
+
+/* Enable appropriate clocks for a BSC/I2C port */
+int clk_bsc_enable(void *base)
+{
+	int ret;
+	char *bscstr, *apbstr;
+
+	switch ((u32) base) {
+	case PMU_BSC_BASE_ADDR:
+		/* PMU clock is always enabled */
+		return 0;
+	case BSC1_BASE_ADDR:
+		bscstr = "bsc1_clk";
+		apbstr = "bsc1_apb_clk";
+		break;
+	case BSC2_BASE_ADDR:
+		bscstr = "bsc2_clk";
+		apbstr = "bsc2_apb_clk";
+		break;
+	case BSC3_BASE_ADDR:
+		bscstr = "bsc3_clk";
+		apbstr = "bsc3_apb_clk";
+		break;
+	default:
+		printf("%s: base 0x%p not found\n", __func__, base);
+		return -EINVAL;
+	}
+
+	/* Note that the bus clock must be enabled first */
+
+	ret = clk_get_and_enable(apbstr);
+	if (ret)
+		return ret;
+
+	ret = clk_get_and_enable(bscstr);
+	if (ret)
+		return ret;
+
+	return 0;
+}