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

Commit Message

Aisheng Dong Oct. 18, 2018, 4:53 p.m. UTC

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 <[e-mail]>
Cc: Sascha Hauer <[e-mail]>
Cc: Fabio Estevam <[e-mail]>
Cc: Stephen Boyd <[e-mail]>
Cc: Michael Turquette <[e-mail]>
Signed-off-by: Dong Aisheng <[e-mail]>
---
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

Patch

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 <[e-mail]>
+ */
+
+#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