[PATCH 4/9] clk: imx: Support building i.MX common clock driver as module

From: Anson Huang
Date: Mon Jun 08 2020 - 09:23:35 EST


There are more and more requirements of building SoC specific drivers
as modules, add support for building i.MX common clock driver as module
to meet the requirement.

Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
---
drivers/clk/imx/Kconfig | 8 ++++++--
drivers/clk/imx/Makefile | 25 +++++--------------------
drivers/clk/imx/clk-composite-8m.c | 1 +
drivers/clk/imx/clk-cpu.c | 1 +
drivers/clk/imx/clk-frac-pll.c | 1 +
drivers/clk/imx/clk-gate2.c | 1 +
drivers/clk/imx/clk-lpcg-scu.c | 1 +
drivers/clk/imx/clk-pll14xx.c | 4 ++++
drivers/clk/imx/clk-sscg-pll.c | 1 +
drivers/clk/imx/clk.c | 28 ++++++++++++++++++++++------
10 files changed, 43 insertions(+), 28 deletions(-)

diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig
index 503d6c8..54ad2ee 100644
--- a/drivers/clk/imx/Kconfig
+++ b/drivers/clk/imx/Kconfig
@@ -1,8 +1,8 @@
# SPDX-License-Identifier: GPL-2.0
# common clock support for NXP i.MX SoC family.
config MXC_CLK
- bool
- def_bool ARCH_MXC
+ tristate "IMX clock"
+ depends on ARCH_MXC

config MXC_CLK_SCU
tristate "IMX SCU clock"
@@ -11,24 +11,28 @@ config MXC_CLK_SCU
config CLK_IMX8MM
bool "IMX8MM CCM Clock Driver"
depends on ARCH_MXC
+ select MXC_CLK
help
Build the driver for i.MX8MM CCM Clock Driver

config CLK_IMX8MN
bool "IMX8MN CCM Clock Driver"
depends on ARCH_MXC
+ select MXC_CLK
help
Build the driver for i.MX8MN CCM Clock Driver

config CLK_IMX8MP
bool "IMX8MP CCM Clock Driver"
depends on ARCH_MXC
+ select MXC_CLK
help
Build the driver for i.MX8MP CCM Clock Driver

config CLK_IMX8MQ
bool "IMX8MQ CCM Clock Driver"
depends on ARCH_MXC
+ select MXC_CLK
help
Build the driver for i.MX8MQ CCM Clock Driver

diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile
index 1af8cff..1291f9b 100644
--- a/drivers/clk/imx/Makefile
+++ b/drivers/clk/imx/Makefile
@@ -1,25 +1,10 @@
# SPDX-License-Identifier: GPL-2.0

-obj-$(CONFIG_MXC_CLK) += \
- clk.o \
- clk-busy.o \
- clk-composite-8m.o \
- clk-cpu.o \
- clk-composite-7ulp.o \
- clk-divider-gate.o \
- clk-fixup-div.o \
- clk-fixup-mux.o \
- clk-frac-pll.o \
- clk-gate-exclusive.o \
- clk-gate2.o \
- clk-pfd.o \
- clk-pfdv2.o \
- clk-pllv1.o \
- clk-pllv2.o \
- clk-pllv3.o \
- clk-pllv4.o \
- clk-sscg-pll.o \
- clk-pll14xx.o
+mxc-clk-objs += clk.o clk-busy.o clk-composite-8m.o clk-cpu.o clk-composite-7ulp.o \
+ clk-divider-gate.o clk-fixup-div.o clk-fixup-mux.o clk-frac-pll.o \
+ clk-gate-exclusive.o clk-gate2.o clk-pfd.o clk-pfdv2.o clk-pllv1.o \
+ clk-pllv2.o clk-pllv3.o clk-pllv4.o clk-sscg-pll.o clk-pll14xx.o
+obj-$(CONFIG_MXC_CLK) += mxc-clk.o

mxc-clk-scu-objs += clk-scu.o clk-lpcg-scu.o
obj-$(CONFIG_MXC_CLK_SCU) += mxc-clk-scu.o
diff --git a/drivers/clk/imx/clk-composite-8m.c b/drivers/clk/imx/clk-composite-8m.c
index d2b5af8..73e064b 100644
--- a/drivers/clk/imx/clk-composite-8m.c
+++ b/drivers/clk/imx/clk-composite-8m.c
@@ -243,3 +243,4 @@ struct clk_hw *imx8m_clk_hw_composite_flags(const char *name,
kfree(mux);
return ERR_CAST(hw);
}
+EXPORT_SYMBOL_GPL(imx8m_clk_hw_composite_flags);
diff --git a/drivers/clk/imx/clk-cpu.c b/drivers/clk/imx/clk-cpu.c
index cb182be..07dc88b 100644
--- a/drivers/clk/imx/clk-cpu.c
+++ b/drivers/clk/imx/clk-cpu.c
@@ -104,3 +104,4 @@ struct clk_hw *imx_clk_hw_cpu(const char *name, const char *parent_name,

return hw;
}
+EXPORT_SYMBOL_GPL(imx_clk_hw_cpu);
diff --git a/drivers/clk/imx/clk-frac-pll.c b/drivers/clk/imx/clk-frac-pll.c
index 101e0a3..aa6aebf 100644
--- a/drivers/clk/imx/clk-frac-pll.c
+++ b/drivers/clk/imx/clk-frac-pll.c
@@ -233,3 +233,4 @@ struct clk_hw *imx_clk_hw_frac_pll(const char *name,

return hw;
}
+EXPORT_SYMBOL_GPL(imx_clk_hw_frac_pll);
diff --git a/drivers/clk/imx/clk-gate2.c b/drivers/clk/imx/clk-gate2.c
index b87ab3c..b1b93ea 100644
--- a/drivers/clk/imx/clk-gate2.c
+++ b/drivers/clk/imx/clk-gate2.c
@@ -177,3 +177,4 @@ struct clk_hw *clk_hw_register_gate2(struct device *dev, const char *name,

return hw;
}
+EXPORT_SYMBOL_GPL(clk_hw_register_gate2);
diff --git a/drivers/clk/imx/clk-lpcg-scu.c b/drivers/clk/imx/clk-lpcg-scu.c
index a73a799..8177f0e 100644
--- a/drivers/clk/imx/clk-lpcg-scu.c
+++ b/drivers/clk/imx/clk-lpcg-scu.c
@@ -114,3 +114,4 @@ struct clk_hw *imx_clk_lpcg_scu(const char *name, const char *parent_name,

return hw;
}
+EXPORT_SYMBOL_GPL(imx_clk_lpcg_scu);
diff --git a/drivers/clk/imx/clk-pll14xx.c b/drivers/clk/imx/clk-pll14xx.c
index f9eb189..5482775 100644
--- a/drivers/clk/imx/clk-pll14xx.c
+++ b/drivers/clk/imx/clk-pll14xx.c
@@ -68,6 +68,7 @@ struct imx_pll14xx_clk imx_1443x_pll = {
.rate_table = imx_pll1443x_tbl,
.rate_count = ARRAY_SIZE(imx_pll1443x_tbl),
};
+EXPORT_SYMBOL_GPL(imx_1443x_pll);

struct imx_pll14xx_clk imx_1443x_dram_pll = {
.type = PLL_1443X,
@@ -75,12 +76,14 @@ struct imx_pll14xx_clk imx_1443x_dram_pll = {
.rate_count = ARRAY_SIZE(imx_pll1443x_tbl),
.flags = CLK_GET_RATE_NOCACHE,
};
+EXPORT_SYMBOL_GPL(imx_1443x_dram_pll);

struct imx_pll14xx_clk imx_1416x_pll = {
.type = PLL_1416X,
.rate_table = imx_pll1416x_tbl,
.rate_count = ARRAY_SIZE(imx_pll1416x_tbl),
};
+EXPORT_SYMBOL_GPL(imx_1416x_pll);

static const struct imx_pll14xx_rate_table *imx_get_pll_settings(
struct clk_pll14xx *pll, unsigned long rate)
@@ -436,3 +439,4 @@ struct clk_hw *imx_dev_clk_hw_pll14xx(struct device *dev, const char *name,

return hw;
}
+EXPORT_SYMBOL_GPL(imx_dev_clk_hw_pll14xx);
diff --git a/drivers/clk/imx/clk-sscg-pll.c b/drivers/clk/imx/clk-sscg-pll.c
index 773d8a5..2f6a0a0 100644
--- a/drivers/clk/imx/clk-sscg-pll.c
+++ b/drivers/clk/imx/clk-sscg-pll.c
@@ -537,3 +537,4 @@ struct clk_hw *imx_clk_hw_sscg_pll(const char *name,

return hw;
}
+EXPORT_SYMBOL_GPL(imx_clk_hw_sscg_pll);
diff --git a/drivers/clk/imx/clk.c b/drivers/clk/imx/clk.c
index 87ab8db..cc894b5 100644
--- a/drivers/clk/imx/clk.c
+++ b/drivers/clk/imx/clk.c
@@ -3,6 +3,7 @@
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/io.h>
+#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
@@ -13,6 +14,7 @@
#define CCDR_MMDC_CH1_MASK BIT(16)

DEFINE_SPINLOCK(imx_ccm_lock);
+EXPORT_SYMBOL_GPL(imx_ccm_lock);

void imx_unregister_clocks(struct clk *clks[], unsigned int count)
{
@@ -29,8 +31,9 @@ void imx_unregister_hw_clocks(struct clk_hw *hws[], unsigned int count)
for (i = 0; i < count; i++)
clk_hw_unregister(hws[i]);
}
+EXPORT_SYMBOL_GPL(imx_unregister_hw_clocks);

-void __init imx_mmdc_mask_handshake(void __iomem *ccm_base,
+void imx_mmdc_mask_handshake(void __iomem *ccm_base,
unsigned int chn)
{
unsigned int reg;
@@ -59,8 +62,9 @@ void imx_check_clk_hws(struct clk_hw *clks[], unsigned int count)
pr_err("i.MX clk %u: register failed with %ld\n",
i, PTR_ERR(clks[i]));
}
+EXPORT_SYMBOL_GPL(imx_check_clk_hws);

-static struct clk * __init imx_obtain_fixed_clock_from_dt(const char *name)
+static struct clk *imx_obtain_fixed_clock_from_dt(const char *name)
{
struct of_phandle_args phandle;
struct clk *clk = ERR_PTR(-ENODEV);
@@ -80,7 +84,7 @@ static struct clk * __init imx_obtain_fixed_clock_from_dt(const char *name)
return clk;
}

-struct clk * __init imx_obtain_fixed_clock(
+struct clk *imx_obtain_fixed_clock(
const char *name, unsigned long rate)
{
struct clk *clk;
@@ -91,7 +95,7 @@ struct clk * __init imx_obtain_fixed_clock(
return clk;
}

-struct clk_hw * __init imx_obtain_fixed_clock_hw(
+struct clk_hw *imx_obtain_fixed_clock_hw(
const char *name, unsigned long rate)
{
struct clk *clk;
@@ -113,6 +117,7 @@ struct clk_hw * imx_obtain_fixed_clk_hw(struct device_node *np,

return __clk_get_hw(clk);
}
+EXPORT_SYMBOL_GPL(imx_obtain_fixed_clk_hw);

/*
* This fixups the register CCM_CSCMR1 write value.
@@ -143,16 +148,24 @@ void imx_cscmr1_fixup(u32 *val)
static int imx_keep_uart_clocks;
static struct clk ** const *imx_uart_clocks;

-static int __init imx_keep_uart_clocks_param(char *str)
+static int __maybe_unused imx_keep_uart_clocks_param(char *str)
{
imx_keep_uart_clocks = 1;

return 0;
}
+
+#ifdef MODULE
+__setup_param("earlycon", imx_keep_uart_earlycon,
+ imx_keep_uart_clocks_param);
+__setup_param("earlyprintk", imx_keep_uart_earlyprintk,
+ imx_keep_uart_clocks_param);
+#else
__setup_param("earlycon", imx_keep_uart_earlycon,
imx_keep_uart_clocks_param, 0);
__setup_param("earlyprintk", imx_keep_uart_earlyprintk,
imx_keep_uart_clocks_param, 0);
+#endif

void imx_register_uart_clocks(struct clk ** const clks[])
{
@@ -164,8 +177,9 @@ void imx_register_uart_clocks(struct clk ** const clks[])
clk_prepare_enable(*imx_uart_clocks[i]);
}
}
+EXPORT_SYMBOL_GPL(imx_register_uart_clocks);

-static int __init imx_clk_disable_uart(void)
+static int imx_clk_disable_uart(void)
{
if (imx_keep_uart_clocks && imx_uart_clocks) {
int i;
@@ -177,3 +191,5 @@ static int __init imx_clk_disable_uart(void)
return 0;
}
late_initcall_sync(imx_clk_disable_uart);
+
+MODULE_LICENSE("GPL v2");
--
2.7.4