[PATCH V5 2/9] clk: imx: scu: add scu clock common part

[aisheng.dong@nxp.com (A.s. Dong)]

Add scu clock common part which will be used by client clock drivers.
SCU clocks are totally different from the legacy clocks (No much
legacy things can be reused). So a new configuration option
CONFIG_MXC_CLK_SCU is added.

Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
ChangeLog:
v4->v5:
 * add more explanation in commit message on why put scu clocks
   in a deeper folder.
 * move scu clk files into the top directory of imx folder
v3->v4:
 * scu headfile path change
v2->v3:
 * no changes
v1->v2:
 * update function call name
---
 drivers/clk/imx/Kconfig   |  4 ++++
 drivers/clk/imx/Makefile  |  3 +++
 drivers/clk/imx/clk-scu.c | 17 +++++++++++++++++
 drivers/clk/imx/clk-scu.h | 18 ++++++++++++++++++
 4 files changed, 42 insertions(+)
 create mode 100644 drivers/clk/imx/clk-scu.c
 create mode 100644 drivers/clk/imx/clk-scu.h

diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig
index 43a3ecc..63e7b01 100644
--- a/drivers/clk/imx/Kconfig
+++ b/drivers/clk/imx/Kconfig
@@ -3,3 +3,7 @@
 config MXC_CLK
 	bool
 	depends on ARCH_MXC
+
+config MXC_CLK_SCU
+	bool
+	depends on ARCH_MXC && ARM64
diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile
index d447f8c..eec6d72 100644
--- a/drivers/clk/imx/Makefile
+++ b/drivers/clk/imx/Makefile
@@ -13,6 +13,9 @@ obj-$(CONFIG_MXC_CLK) += \
 	clk-pllv3.o \
 	clk-pfd.o
 
+obj-$(CONFIG_MXC_CLK_SCU) += \
+	clk-scu.o
+
 obj-$(CONFIG_SOC_IMX1)   += clk-imx1.o
 obj-$(CONFIG_SOC_IMX21)  += clk-imx21.o
 obj-$(CONFIG_SOC_IMX25)  += clk-imx25.o
diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
new file mode 100644
index 0000000..826049f
--- /dev/null
+++ b/drivers/clk/imx/clk-scu.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017~2018 NXP
+ *	Dong Aisheng <aisheng.dong@nxp.com>
+ */
+
+#include <linux/errno.h>
+#include "clk-scu.h"
+
+DEFINE_SPINLOCK(imx_ccm_lock);
+struct imx_sc_ipc *ccm_ipc_handle;
+
+int imx_clk_scu_init(void)
+{
+	return imx_scu_get_handle(&ccm_ipc_handle);
+}
diff --git a/drivers/clk/imx/clk-scu.h b/drivers/clk/imx/clk-scu.h
new file mode 100644
index 0000000..b964f35
--- /dev/null
+++ b/drivers/clk/imx/clk-scu.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017~2018 NXP
+ */
+
+#ifndef __IMX_CLK_SCU_H
+#define __IMX_CLK_SCU_H
+
+#include <linux/firmware/imx/sci.h>
+#include <linux/spinlock.h>
+
+extern spinlock_t imx_ccm_lock;
+extern struct imx_sc_ipc *ccm_ipc_handle;
+
+int imx_clk_scu_init(void);
+
+#endif
-- 
2.7.4