Patchwork clk: new driver for efm32 SoC

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Submitter Uwe Kleine-König
Date Aug. 14, 2013, 8:04 p.m.
Message ID <1376510693-12491-1-git-send-email-u.kleine-koenig@pengutronix.de>
Download mbox | patch
Permalink /patch/267188/
State New
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Comments

Uwe Kleine-König - Aug. 14, 2013, 8:04 p.m.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
Hello,

I'm not sure if there is a naming convention for #defines in headers below
dt-bindings. I named my clocks clk_$namefromreferencemanual to have some
namespacing.

The clock stuff on the different variants of efm32 are similar, but
different enough to not be able to use the same driver, so this is only
for the Giant Gecko (efm32gg) variant, still I used "efm32" in some
places because the other variants would fit there, too. (For
include/dt-bindings/clock/efm32-cmu.h I would need some #ifdefs, is that
OK or should the name of the defines include efm32gg? (That would make
the names still longer and so more ugly.))

Best regards
Uwe

 .../devicetree/bindings/clock/efm32-clock.txt      | 11 +++
 drivers/clk/Makefile                               |  1 +
 drivers/clk/clk-efm32gg.c                          | 79 ++++++++++++++++++++++
 include/dt-bindings/clock/efm32-cmu.h              | 42 ++++++++++++
 include/linux/clk/efm32.h                          |  6 ++
 5 files changed, 139 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/efm32-clock.txt
 create mode 100644 drivers/clk/clk-efm32gg.c
 create mode 100644 include/dt-bindings/clock/efm32-cmu.h
 create mode 100644 include/linux/clk/efm32.h
Mike Turquette - Oct. 7, 2013, 9:23 p.m.
Quoting Uwe Kleine-König (2013-08-14 13:04:53)
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
> Hello,
> 
> I'm not sure if there is a naming convention for #defines in headers below
> dt-bindings. I named my clocks clk_$namefromreferencemanual to have some
> namespacing.
> 
> The clock stuff on the different variants of efm32 are similar, but
> different enough to not be able to use the same driver, so this is only
> for the Giant Gecko (efm32gg) variant, still I used "efm32" in some
> places because the other variants would fit there, too. (For
> include/dt-bindings/clock/efm32-cmu.h I would need some #ifdefs, is that
> OK or should the name of the defines include efm32gg? (That would make
> the names still longer and so more ugly.))

The DT experts should weigh in on having #ifdef's in the header, but I
think we should avoid that. Better to explicitly list the clocks for the
variant used. You can add "gg" to this or not, I don't care, but the
future variants will need some suffix, or maybe their own header.

I'm happy with this patch and can take it for 3.13. Care to add a
changelog?

Regards,
Mike

> 
> Best regards
> Uwe
> 
>  .../devicetree/bindings/clock/efm32-clock.txt      | 11 +++
>  drivers/clk/Makefile                               |  1 +
>  drivers/clk/clk-efm32gg.c                          | 79 ++++++++++++++++++++++
>  include/dt-bindings/clock/efm32-cmu.h              | 42 ++++++++++++
>  include/linux/clk/efm32.h                          |  6 ++
>  5 files changed, 139 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/efm32-clock.txt
>  create mode 100644 drivers/clk/clk-efm32gg.c
>  create mode 100644 include/dt-bindings/clock/efm32-cmu.h
>  create mode 100644 include/linux/clk/efm32.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/efm32-clock.txt b/Documentation/devicetree/bindings/clock/efm32-clock.txt
> new file mode 100644
> index 0000000..263d293
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/efm32-clock.txt
> @@ -0,0 +1,11 @@
> +* Clock bindings for Energy Micro efm32 Giant Gecko's Clock Management Unit
> +
> +Required properties:
> +- compatible: Should be "efm32gg,cmu"
> +- reg: Base address and length of the register set
> +- interrupts: Interrupt used by the CMU
> +- #clock-cells: Should be <1>
> +
> +The clock consumer should specify the desired clock by having the clock ID in
> +its "clocks" phandle cell. The header efm32-clk.h contains a list of available
> +IDs.
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index 4038c2b..99d9ad0 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_COMMON_CLK)      += clk-composite.o
>  
>  # SoCs specific
>  obj-$(CONFIG_ARCH_BCM2835)     += clk-bcm2835.o
> +obj-$(CONFIG_ARCH_EFM32)       += clk-efm32gg.o
>  obj-$(CONFIG_ARCH_NOMADIK)     += clk-nomadik.o
>  obj-$(CONFIG_ARCH_HIGHBANK)    += clk-highbank.o
>  obj-$(CONFIG_ARCH_NSPIRE)      += clk-nspire.o
> diff --git a/drivers/clk/clk-efm32gg.c b/drivers/clk/clk-efm32gg.c
> new file mode 100644
> index 0000000..2e63584
> --- /dev/null
> +++ b/drivers/clk/clk-efm32gg.c
> @@ -0,0 +1,79 @@
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/clk-provider.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +
> +#include <dt-bindings/clock/efm32-cmu.h>
> +
> +#define CMU_HFPERCLKEN0                0x44
> +
> +static struct clk *clk[37];
> +static struct clk_onecell_data clk_data = {
> +       .clks = clk,
> +       .clk_num = ARRAY_SIZE(clk),
> +};
> +
> +int __init efm32gg_clk_init(void)
> +{
> +       int i;
> +       struct device_node *np;
> +       void __iomem *base;
> +
> +       for (i = 0; i < ARRAY_SIZE(clk); ++i)
> +               clk[i] = ERR_PTR(-ENOENT);
> +
> +       np = of_find_compatible_node(NULL, NULL, "efm32gg,cmu");
> +       if (!np) {
> +               pr_warn("No efm32gg,cmu node found in device tree\n");
> +               return -ENOENT;
> +       }
> +
> +       base = of_iomap(np, 0);
> +       if (!base) {
> +               pr_warn("Failed to map address range for efm32gg,cmu node\n");
> +               return -EADDRNOTAVAIL;
> +       }
> +
> +       clk[clk_HFXO] = clk_register_fixed_rate(NULL, "HFXO", NULL,
> +                       CLK_IS_ROOT, 48000000);
> +
> +       clk[clk_HFPERCLKUSART0] = clk_register_gate(NULL, "HFPERCLK.USART0",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 0, 0, NULL);
> +       clk[clk_HFPERCLKUSART1] = clk_register_gate(NULL, "HFPERCLK.USART1",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 1, 0, NULL);
> +       clk[clk_HFPERCLKUSART2] = clk_register_gate(NULL, "HFPERCLK.USART2",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 2, 0, NULL);
> +       clk[clk_HFPERCLKUART0] = clk_register_gate(NULL, "HFPERCLK.UART0",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 3, 0, NULL);
> +       clk[clk_HFPERCLKUART1] = clk_register_gate(NULL, "HFPERCLK.UART1",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 4, 0, NULL);
> +       clk[clk_HFPERCLKTIMER0] = clk_register_gate(NULL, "HFPERCLK.TIMER0",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 5, 0, NULL);
> +       clk[clk_HFPERCLKTIMER1] = clk_register_gate(NULL, "HFPERCLK.TIMER1",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 6, 0, NULL);
> +       clk[clk_HFPERCLKTIMER2] = clk_register_gate(NULL, "HFPERCLK.TIMER2",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 7, 0, NULL);
> +       clk[clk_HFPERCLKTIMER3] = clk_register_gate(NULL, "HFPERCLK.TIMER3",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 8, 0, NULL);
> +       clk[clk_HFPERCLKACMP0] = clk_register_gate(NULL, "HFPERCLK.ACMP0",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 9, 0, NULL);
> +       clk[clk_HFPERCLKACMP1] = clk_register_gate(NULL, "HFPERCLK.ACMP1",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 10, 0, NULL);
> +       clk[clk_HFPERCLKI2C0] = clk_register_gate(NULL, "HFPERCLK.I2C0",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 11, 0, NULL);
> +       clk[clk_HFPERCLKI2C1] = clk_register_gate(NULL, "HFPERCLK.I2C1",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 12, 0, NULL);
> +       clk[clk_HFPERCLKGPIO] = clk_register_gate(NULL, "HFPERCLK.GPIO",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 13, 0, NULL);
> +       clk[clk_HFPERCLKVCMP] = clk_register_gate(NULL, "HFPERCLK.VCMP",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 14, 0, NULL);
> +       clk[clk_HFPERCLKPRS] = clk_register_gate(NULL, "HFPERCLK.PRS",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 15, 0, NULL);
> +       clk[clk_HFPERCLKADC0] = clk_register_gate(NULL, "HFPERCLK.ADC0",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 16, 0, NULL);
> +       clk[clk_HFPERCLKDAC0] = clk_register_gate(NULL, "HFPERCLK.DAC0",
> +                       "HFXO", 0, base + CMU_HFPERCLKEN0, 17, 0, NULL);
> +
> +       return of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
> +}
> diff --git a/include/dt-bindings/clock/efm32-cmu.h b/include/dt-bindings/clock/efm32-cmu.h
> new file mode 100644
> index 0000000..b21b91e
> --- /dev/null
> +++ b/include/dt-bindings/clock/efm32-cmu.h
> @@ -0,0 +1,42 @@
> +#ifndef __DT_BINDINGS_CLOCK_EFM32_CMU_H
> +#define __DT_BINDINGS_CLOCK_EFM32_CMU_H
> +
> +#define clk_HFXO               0
> +#define clk_HFRCO              1
> +#define clk_LFXO               2
> +#define clk_LFRCO              3
> +#define clk_ULFRCO             4
> +#define clk_AUXHFRCO           5
> +#define clk_HFCLKNODIV         6
> +#define clk_HFCLK              7
> +#define clk_HFPERCLK           8
> +#define clk_HFCORECLK          9
> +#define clk_LFACLK             10
> +#define clk_LFBCLK             11
> +#define clk_WDOGCLK            12
> +#define clk_HFCORECLKDMA       13
> +#define clk_HFCORECLKAES       14
> +#define clk_HFCORECLKUSBC      15
> +#define clk_HFCORECLKUSB       16
> +#define clk_HFCORECLKLE                17
> +#define clk_HFCORECLKEBI       18
> +#define clk_HFPERCLKUSART0     19
> +#define clk_HFPERCLKUSART1     20
> +#define clk_HFPERCLKUSART2     21
> +#define clk_HFPERCLKUART0      22
> +#define clk_HFPERCLKUART1      23
> +#define clk_HFPERCLKTIMER0     24
> +#define clk_HFPERCLKTIMER1     25
> +#define clk_HFPERCLKTIMER2     26
> +#define clk_HFPERCLKTIMER3     27
> +#define clk_HFPERCLKACMP0      28
> +#define clk_HFPERCLKACMP1      29
> +#define clk_HFPERCLKI2C0       30
> +#define clk_HFPERCLKI2C1       31
> +#define clk_HFPERCLKGPIO       32
> +#define clk_HFPERCLKVCMP       33
> +#define clk_HFPERCLKPRS                34
> +#define clk_HFPERCLKADC0       35
> +#define clk_HFPERCLKDAC0       36
> +
> +#endif /* __DT_BINDINGS_CLOCK_EFM32_CMU_H */
> diff --git a/include/linux/clk/efm32.h b/include/linux/clk/efm32.h
> new file mode 100644
> index 0000000..4032dc0
> --- /dev/null
> +++ b/include/linux/clk/efm32.h
> @@ -0,0 +1,6 @@
> +#ifndef __LINUX_CLK_EFM32_H__
> +#define __LINUX_CLK_EFM32_H__
> +
> +int efm32gg_clk_init(void);
> +
> +#endif /* __LINUX_CLK_EFM32_H__ */
> -- 
> 1.8.4.rc0
Uwe Kleine-König - Oct. 8, 2013, 7:40 a.m.
Hello Mike,

On Mon, Oct 07, 2013 at 02:23:54PM -0700, Mike Turquette wrote:
> Quoting Uwe Kleine-König (2013-08-14 13:04:53)
> > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> > ---
> > Hello,
> > 
> > I'm not sure if there is a naming convention for #defines in headers below
> > dt-bindings. I named my clocks clk_$namefromreferencemanual to have some
> > namespacing.
> > 
> > The clock stuff on the different variants of efm32 are similar, but
> > different enough to not be able to use the same driver, so this is only
> > for the Giant Gecko (efm32gg) variant, still I used "efm32" in some
> > places because the other variants would fit there, too. (For
> > include/dt-bindings/clock/efm32-cmu.h I would need some #ifdefs, is that
> > OK or should the name of the defines include efm32gg? (That would make
> > the names still longer and so more ugly.))
> 
> The DT experts should weigh in on having #ifdef's in the header, but I
> think we should avoid that. Better to explicitly list the clocks for the
> variant used. You can add "gg" to this or not, I don't care, but the
> future variants will need some suffix, or maybe their own header.
I thought the way to go is to move the clocks into the device tree. That
would get rid of the need to add #ifdefs. OTOH even if the corresponding
clocks are using different register offsets and bit locations, I don't
see a need to also take a different clock index, so currently I think it
should be possible to not need #ifdefs even if we're going with this
patch's approach.

So if you are happy with my patch as is, it would be great if you'd take
it. We could also switch to in-dt-defined clocks later when it becomes
easier while maintaining this interface for compatibility.

> I'm happy with this patch and can take it for 3.13. Care to add a
> changelog?
What do you want? I could add:

	This patch adds support for the clocks provided by the Clock
	Management Unit of Energy Micro's efm32 Giant Gecko SoCs
	including device tree bindings.

I will send a v2 that makes use of the CLK_OF_DECLARE macro and so saves
the external init function.

Best regards
Uwe

Patch

diff --git a/Documentation/devicetree/bindings/clock/efm32-clock.txt b/Documentation/devicetree/bindings/clock/efm32-clock.txt
new file mode 100644
index 0000000..263d293
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/efm32-clock.txt
@@ -0,0 +1,11 @@ 
+* Clock bindings for Energy Micro efm32 Giant Gecko's Clock Management Unit
+
+Required properties:
+- compatible: Should be "efm32gg,cmu"
+- reg: Base address and length of the register set
+- interrupts: Interrupt used by the CMU
+- #clock-cells: Should be <1>
+
+The clock consumer should specify the desired clock by having the clock ID in
+its "clocks" phandle cell. The header efm32-clk.h contains a list of available
+IDs.
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 4038c2b..99d9ad0 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -11,6 +11,7 @@  obj-$(CONFIG_COMMON_CLK)	+= clk-composite.o
 
 # SoCs specific
 obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835.o
+obj-$(CONFIG_ARCH_EFM32)	+= clk-efm32gg.o
 obj-$(CONFIG_ARCH_NOMADIK)	+= clk-nomadik.o
 obj-$(CONFIG_ARCH_HIGHBANK)	+= clk-highbank.o
 obj-$(CONFIG_ARCH_NSPIRE)	+= clk-nspire.o
diff --git a/drivers/clk/clk-efm32gg.c b/drivers/clk/clk-efm32gg.c
new file mode 100644
index 0000000..2e63584
--- /dev/null
+++ b/drivers/clk/clk-efm32gg.c
@@ -0,0 +1,79 @@ 
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <dt-bindings/clock/efm32-cmu.h>
+
+#define CMU_HFPERCLKEN0		0x44
+
+static struct clk *clk[37];
+static struct clk_onecell_data clk_data = {
+	.clks = clk,
+	.clk_num = ARRAY_SIZE(clk),
+};
+
+int __init efm32gg_clk_init(void)
+{
+	int i;
+	struct device_node *np;
+	void __iomem *base;
+
+	for (i = 0; i < ARRAY_SIZE(clk); ++i)
+		clk[i] = ERR_PTR(-ENOENT);
+
+	np = of_find_compatible_node(NULL, NULL, "efm32gg,cmu");
+	if (!np) {
+		pr_warn("No efm32gg,cmu node found in device tree\n");
+		return -ENOENT;
+	}
+
+	base = of_iomap(np, 0);
+	if (!base) {
+		pr_warn("Failed to map address range for efm32gg,cmu node\n");
+		return -EADDRNOTAVAIL;
+	}
+
+	clk[clk_HFXO] = clk_register_fixed_rate(NULL, "HFXO", NULL,
+			CLK_IS_ROOT, 48000000);
+
+	clk[clk_HFPERCLKUSART0] = clk_register_gate(NULL, "HFPERCLK.USART0",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 0, 0, NULL);
+	clk[clk_HFPERCLKUSART1] = clk_register_gate(NULL, "HFPERCLK.USART1",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 1, 0, NULL);
+	clk[clk_HFPERCLKUSART2] = clk_register_gate(NULL, "HFPERCLK.USART2",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 2, 0, NULL);
+	clk[clk_HFPERCLKUART0] = clk_register_gate(NULL, "HFPERCLK.UART0",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 3, 0, NULL);
+	clk[clk_HFPERCLKUART1] = clk_register_gate(NULL, "HFPERCLK.UART1",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 4, 0, NULL);
+	clk[clk_HFPERCLKTIMER0] = clk_register_gate(NULL, "HFPERCLK.TIMER0",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 5, 0, NULL);
+	clk[clk_HFPERCLKTIMER1] = clk_register_gate(NULL, "HFPERCLK.TIMER1",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 6, 0, NULL);
+	clk[clk_HFPERCLKTIMER2] = clk_register_gate(NULL, "HFPERCLK.TIMER2",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 7, 0, NULL);
+	clk[clk_HFPERCLKTIMER3] = clk_register_gate(NULL, "HFPERCLK.TIMER3",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 8, 0, NULL);
+	clk[clk_HFPERCLKACMP0] = clk_register_gate(NULL, "HFPERCLK.ACMP0",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 9, 0, NULL);
+	clk[clk_HFPERCLKACMP1] = clk_register_gate(NULL, "HFPERCLK.ACMP1",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 10, 0, NULL);
+	clk[clk_HFPERCLKI2C0] = clk_register_gate(NULL, "HFPERCLK.I2C0",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 11, 0, NULL);
+	clk[clk_HFPERCLKI2C1] = clk_register_gate(NULL, "HFPERCLK.I2C1",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 12, 0, NULL);
+	clk[clk_HFPERCLKGPIO] = clk_register_gate(NULL, "HFPERCLK.GPIO",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 13, 0, NULL);
+	clk[clk_HFPERCLKVCMP] = clk_register_gate(NULL, "HFPERCLK.VCMP",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 14, 0, NULL);
+	clk[clk_HFPERCLKPRS] = clk_register_gate(NULL, "HFPERCLK.PRS",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 15, 0, NULL);
+	clk[clk_HFPERCLKADC0] = clk_register_gate(NULL, "HFPERCLK.ADC0",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 16, 0, NULL);
+	clk[clk_HFPERCLKDAC0] = clk_register_gate(NULL, "HFPERCLK.DAC0",
+			"HFXO", 0, base + CMU_HFPERCLKEN0, 17, 0, NULL);
+
+	return of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
+}
diff --git a/include/dt-bindings/clock/efm32-cmu.h b/include/dt-bindings/clock/efm32-cmu.h
new file mode 100644
index 0000000..b21b91e
--- /dev/null
+++ b/include/dt-bindings/clock/efm32-cmu.h
@@ -0,0 +1,42 @@ 
+#ifndef __DT_BINDINGS_CLOCK_EFM32_CMU_H
+#define __DT_BINDINGS_CLOCK_EFM32_CMU_H
+
+#define clk_HFXO		0
+#define clk_HFRCO		1
+#define clk_LFXO		2
+#define clk_LFRCO		3
+#define clk_ULFRCO		4
+#define clk_AUXHFRCO		5
+#define clk_HFCLKNODIV		6
+#define clk_HFCLK		7
+#define clk_HFPERCLK		8
+#define clk_HFCORECLK		9
+#define clk_LFACLK		10
+#define clk_LFBCLK		11
+#define clk_WDOGCLK		12
+#define clk_HFCORECLKDMA	13
+#define clk_HFCORECLKAES	14
+#define clk_HFCORECLKUSBC	15
+#define clk_HFCORECLKUSB	16
+#define clk_HFCORECLKLE		17
+#define clk_HFCORECLKEBI	18
+#define clk_HFPERCLKUSART0	19
+#define clk_HFPERCLKUSART1	20
+#define clk_HFPERCLKUSART2	21
+#define clk_HFPERCLKUART0	22
+#define clk_HFPERCLKUART1	23
+#define clk_HFPERCLKTIMER0	24
+#define clk_HFPERCLKTIMER1	25
+#define clk_HFPERCLKTIMER2	26
+#define clk_HFPERCLKTIMER3	27
+#define clk_HFPERCLKACMP0	28
+#define clk_HFPERCLKACMP1	29
+#define clk_HFPERCLKI2C0	30
+#define clk_HFPERCLKI2C1	31
+#define clk_HFPERCLKGPIO	32
+#define clk_HFPERCLKVCMP	33
+#define clk_HFPERCLKPRS		34
+#define clk_HFPERCLKADC0	35
+#define clk_HFPERCLKDAC0	36
+
+#endif /* __DT_BINDINGS_CLOCK_EFM32_CMU_H */
diff --git a/include/linux/clk/efm32.h b/include/linux/clk/efm32.h
new file mode 100644
index 0000000..4032dc0
--- /dev/null
+++ b/include/linux/clk/efm32.h
@@ -0,0 +1,6 @@ 
+#ifndef __LINUX_CLK_EFM32_H__
+#define __LINUX_CLK_EFM32_H__
+
+int efm32gg_clk_init(void);
+
+#endif /* __LINUX_CLK_EFM32_H__ */