imx: mx7ulp: Add clock framework and functions

Add a clock framework to support SCG1/PCC2/PCC3 for A7 to support get/set
clock source, divider, clock rate and parent source.
Users need to include pcc.h to use the APIs to for peripherals clock. Each
peripheral clock is defined in enum pcc_clk type.

SCG relevants APIs are defined in scg.h which supports clock rate get, PLL/PFD
enablement and settings, and all SCG clock initialization. User need use enum
scg_clk to access each clock source.

In clock.c, we initialize necessary clocks at u-boot s_init and implement the
clock functions used by driver modules to operate clocks dynamically.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-mx7ulp/clock.h b/arch/arm/include/asm/arch-mx7ulp/clock.h
new file mode 100644
index 0000000..f21052e
--- /dev/null
+++ b/arch/arm/include/asm/arch-mx7ulp/clock.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _ASM_ARCH_CLOCK_H
+#define _ASM_ARCH_CLOCK_H
+
+#include <common.h>
+#include <asm/arch/pcc.h>
+#include <asm/arch/scg.h>
+
+/* Mainly for compatible to imx common code. */
+enum mxc_clock {
+	MXC_ARM_CLK = 0,
+	MXC_AHB_CLK,
+	MXC_IPG_CLK,
+	MXC_UART_CLK,
+	MXC_CSPI_CLK,
+	MXC_AXI_CLK,
+	MXC_DDR_CLK,
+	MXC_ESDHC_CLK,
+	MXC_ESDHC2_CLK,
+	MXC_I2C_CLK,
+};
+
+u32 mxc_get_clock(enum mxc_clock clk);
+u32 get_lpuart_clk(void);
+#ifdef CONFIG_MXC_OCOTP
+void enable_ocotp_clk(unsigned char enable);
+#endif
+#ifdef CONFIG_USB_EHCI
+void enable_usboh3_clk(unsigned char enable);
+#endif
+void init_clk_usdhc(u32 index);
+void clock_init(void);
+#endif