diff mbox

[v5,1/2] clk: x86: Add ST oscout platform clock

Message ID 1525859941-23654-2-git-send-email-akshu.agrawal@amd.com (mailing list archive)
State Accepted, archived
Delegated to: Rafael Wysocki
Headers show

Commit Message

Akshu Agrawal May 9, 2018, 9:59 a.m. UTC
Stoney SoC provides oscout clock. This clock can support 25Mhz and
48Mhz of frequency.
The clock is available for general system use.

Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
---
v2: config change, added SPDX tag and used clk_hw_register_.
v3: Fix kbuild warning for checking of NULL pointer
v4: unregister clk_hw in driver remove, add .suppress_bind_attrs
v5: Fix license, used static array
 drivers/clk/x86/Makefile             |  3 +-
 drivers/clk/x86/clk-st.c             | 77 ++++++++++++++++++++++++++++++++++++
 include/linux/platform_data/clk-st.h | 17 ++++++++
 3 files changed, 96 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/x86/clk-st.c
 create mode 100644 include/linux/platform_data/clk-st.h

Comments

Daniel Kurtz May 9, 2018, 3:58 p.m. UTC | #1
On Wed, May 9, 2018 at 4:01 AM Akshu Agrawal <akshu.agrawal@amd.com> wrote:

> Stoney SoC provides oscout clock. This clock can support 25Mhz and
> 48Mhz of frequency.
> The clock is available for general system use.

> Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>

Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>


> ---
> v2: config change, added SPDX tag and used clk_hw_register_.
> v3: Fix kbuild warning for checking of NULL pointer
> v4: unregister clk_hw in driver remove, add .suppress_bind_attrs
> v5: Fix license, used static array
>   drivers/clk/x86/Makefile             |  3 +-
>   drivers/clk/x86/clk-st.c             | 77
++++++++++++++++++++++++++++++++++++
>   include/linux/platform_data/clk-st.h | 17 ++++++++
>   3 files changed, 96 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/clk/x86/clk-st.c
>   create mode 100644 include/linux/platform_data/clk-st.h

> diff --git a/drivers/clk/x86/Makefile b/drivers/clk/x86/Makefile
> index 1367afb..00303bc 100644
> --- a/drivers/clk/x86/Makefile
> +++ b/drivers/clk/x86/Makefile
> @@ -1,3 +1,4 @@
> +obj-$(CONFIG_PMC_ATOM)         += clk-pmc-atom.o
> +obj-$(CONFIG_X86_AMD_PLATFORM_DEVICE)  += clk-st.o
>   clk-x86-lpss-objs              := clk-lpt.o
>   obj-$(CONFIG_X86_INTEL_LPSS)   += clk-x86-lpss.o
> -obj-$(CONFIG_PMC_ATOM)         += clk-pmc-atom.o
> diff --git a/drivers/clk/x86/clk-st.c b/drivers/clk/x86/clk-st.c
> new file mode 100644
> index 0000000..fb62f39
> --- /dev/null
> +++ b/drivers/clk/x86/clk-st.c
> @@ -0,0 +1,77 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * clock framework for AMD Stoney based clocks
> + *
> + * Copyright 2018 Advanced Micro Devices, Inc.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/platform_data/clk-st.h>
> +#include <linux/platform_device.h>
> +
> +/* Clock Driving Strength 2 register */
> +#define CLKDRVSTR2     0x28
> +/* Clock Control 1 register */
> +#define MISCCLKCNTL1   0x40
> +/* Auxiliary clock1 enable bit */
> +#define OSCCLKENB      2
> +/* 25Mhz auxiliary output clock freq bit */
> +#define OSCOUT1CLK25MHZ        16
> +
> +#define ST_CLK_48M     0
> +#define ST_CLK_25M     1
> +#define ST_CLK_MUX     2
> +#define ST_CLK_GATE    3
> +#define ST_MAX_CLKS    4
> +
> +static const char * const clk_oscout1_parents[] = { "clk48MHz",
"clk25MHz" };
> +static struct clk_hw *hws[ST_MAX_CLKS];
> +
> +static int st_clk_probe(struct platform_device *pdev)
> +{
> +       struct st_clk_data *st_data;
> +
> +       st_data = dev_get_platdata(&pdev->dev);
> +       if (!st_data || !st_data->base)
> +               return -EINVAL;
> +
> +       hws[ST_CLK_48M] = clk_hw_register_fixed_rate(NULL, "clk48MHz",
NULL, 0,
> +                                                    48000000);
> +       hws[ST_CLK_25M] = clk_hw_register_fixed_rate(NULL, "clk25MHz",
NULL, 0,
> +                                                    25000000);
> +
> +       hws[ST_CLK_MUX] = clk_hw_register_mux(NULL, "oscout1_mux",
> +               clk_oscout1_parents, ARRAY_SIZE(clk_oscout1_parents),
> +               0, st_data->base + CLKDRVSTR2, OSCOUT1CLK25MHZ, 3, 0,
NULL);
> +
> +       clk_set_parent(hws[ST_CLK_MUX]->clk, hws[ST_CLK_25M]->clk);
> +
> +       hws[ST_CLK_GATE] = clk_hw_register_gate(NULL, "oscout1",
"oscout1_mux",
> +               0, st_data->base + MISCCLKCNTL1, OSCCLKENB,
> +               CLK_GATE_SET_TO_DISABLE, NULL);
> +
> +       clk_hw_register_clkdev(hws[ST_CLK_GATE], "oscout1", NULL);
> +
> +       return 0;
> +}
> +
> +static int st_clk_remove(struct platform_device *pdev)
> +{
> +       int i;
> +
> +       for (i = 0; i < ST_MAX_CLKS; i++)
> +               clk_hw_unregister(hws[i]);
> +       return 0;
> +}
> +
> +static struct platform_driver st_clk_driver = {
> +       .driver = {
> +               .name = "clk-st",
> +               .suppress_bind_attrs = true,
> +       },
> +       .probe = st_clk_probe,
> +       .remove = st_clk_remove,
> +};
> +builtin_platform_driver(st_clk_driver);
> diff --git a/include/linux/platform_data/clk-st.h
b/include/linux/platform_data/clk-st.h
> new file mode 100644
> index 0000000..7cdb6a4
> --- /dev/null
> +++ b/include/linux/platform_data/clk-st.h
> @@ -0,0 +1,17 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * clock framework for AMD Stoney based clock
> + *
> + * Copyright 2018 Advanced Micro Devices, Inc.
> + */
> +
> +#ifndef __CLK_ST_H
> +#define __CLK_ST_H
> +
> +#include <linux/compiler.h>
> +
> +struct st_clk_data {
> +       void __iomem *base;
> +};
> +
> +#endif /* __CLK_ST_H */
> --
> 1.9.1
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Rafael J. Wysocki May 15, 2018, 9:32 a.m. UTC | #2
On Wednesday, May 9, 2018 11:59:00 AM CEST Akshu Agrawal wrote:
> Stoney SoC provides oscout clock. This clock can support 25Mhz and
> 48Mhz of frequency.
> The clock is available for general system use.
> 
> Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>

I'm not sure if the Stephen Boyd's comments on one of the previous
versions of this patch have been addressed.  Have they?

In any case, if I'm expected to take this, I need an ACK from Stephen on it.

Thanks,
Rafael

> ---
> v2: config change, added SPDX tag and used clk_hw_register_.
> v3: Fix kbuild warning for checking of NULL pointer
> v4: unregister clk_hw in driver remove, add .suppress_bind_attrs
> v5: Fix license, used static array
>  drivers/clk/x86/Makefile             |  3 +-
>  drivers/clk/x86/clk-st.c             | 77 ++++++++++++++++++++++++++++++++++++
>  include/linux/platform_data/clk-st.h | 17 ++++++++
>  3 files changed, 96 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/clk/x86/clk-st.c
>  create mode 100644 include/linux/platform_data/clk-st.h
> 
> diff --git a/drivers/clk/x86/Makefile b/drivers/clk/x86/Makefile
> index 1367afb..00303bc 100644
> --- a/drivers/clk/x86/Makefile
> +++ b/drivers/clk/x86/Makefile
> @@ -1,3 +1,4 @@
> +obj-$(CONFIG_PMC_ATOM)		+= clk-pmc-atom.o
> +obj-$(CONFIG_X86_AMD_PLATFORM_DEVICE)	+= clk-st.o
>  clk-x86-lpss-objs		:= clk-lpt.o
>  obj-$(CONFIG_X86_INTEL_LPSS)	+= clk-x86-lpss.o
> -obj-$(CONFIG_PMC_ATOM)		+= clk-pmc-atom.o
> diff --git a/drivers/clk/x86/clk-st.c b/drivers/clk/x86/clk-st.c
> new file mode 100644
> index 0000000..fb62f39
> --- /dev/null
> +++ b/drivers/clk/x86/clk-st.c
> @@ -0,0 +1,77 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * clock framework for AMD Stoney based clocks
> + *
> + * Copyright 2018 Advanced Micro Devices, Inc.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/platform_data/clk-st.h>
> +#include <linux/platform_device.h>
> +
> +/* Clock Driving Strength 2 register */
> +#define CLKDRVSTR2	0x28
> +/* Clock Control 1 register */
> +#define MISCCLKCNTL1	0x40
> +/* Auxiliary clock1 enable bit */
> +#define OSCCLKENB	2
> +/* 25Mhz auxiliary output clock freq bit */
> +#define OSCOUT1CLK25MHZ	16
> +
> +#define ST_CLK_48M	0
> +#define ST_CLK_25M	1
> +#define ST_CLK_MUX	2
> +#define ST_CLK_GATE	3
> +#define ST_MAX_CLKS	4
> +
> +static const char * const clk_oscout1_parents[] = { "clk48MHz", "clk25MHz" };
> +static struct clk_hw *hws[ST_MAX_CLKS];
> +
> +static int st_clk_probe(struct platform_device *pdev)
> +{
> +	struct st_clk_data *st_data;
> +
> +	st_data = dev_get_platdata(&pdev->dev);
> +	if (!st_data || !st_data->base)
> +		return -EINVAL;
> +
> +	hws[ST_CLK_48M] = clk_hw_register_fixed_rate(NULL, "clk48MHz", NULL, 0,
> +						     48000000);
> +	hws[ST_CLK_25M] = clk_hw_register_fixed_rate(NULL, "clk25MHz", NULL, 0,
> +						     25000000);
> +
> +	hws[ST_CLK_MUX] = clk_hw_register_mux(NULL, "oscout1_mux",
> +		clk_oscout1_parents, ARRAY_SIZE(clk_oscout1_parents),
> +		0, st_data->base + CLKDRVSTR2, OSCOUT1CLK25MHZ, 3, 0, NULL);
> +
> +	clk_set_parent(hws[ST_CLK_MUX]->clk, hws[ST_CLK_25M]->clk);
> +
> +	hws[ST_CLK_GATE] = clk_hw_register_gate(NULL, "oscout1", "oscout1_mux",
> +		0, st_data->base + MISCCLKCNTL1, OSCCLKENB,
> +		CLK_GATE_SET_TO_DISABLE, NULL);
> +
> +	clk_hw_register_clkdev(hws[ST_CLK_GATE], "oscout1", NULL);
> +
> +	return 0;
> +}
> +
> +static int st_clk_remove(struct platform_device *pdev)
> +{
> +	int i;
> +
> +	for (i = 0; i < ST_MAX_CLKS; i++)
> +		clk_hw_unregister(hws[i]);
> +	return 0;
> +}
> +
> +static struct platform_driver st_clk_driver = {
> +	.driver = {
> +		.name = "clk-st",
> +		.suppress_bind_attrs = true,
> +	},
> +	.probe = st_clk_probe,
> +	.remove = st_clk_remove,
> +};
> +builtin_platform_driver(st_clk_driver);
> diff --git a/include/linux/platform_data/clk-st.h b/include/linux/platform_data/clk-st.h
> new file mode 100644
> index 0000000..7cdb6a4
> --- /dev/null
> +++ b/include/linux/platform_data/clk-st.h
> @@ -0,0 +1,17 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * clock framework for AMD Stoney based clock
> + *
> + * Copyright 2018 Advanced Micro Devices, Inc.
> + */
> +
> +#ifndef __CLK_ST_H
> +#define __CLK_ST_H
> +
> +#include <linux/compiler.h>
> +
> +struct st_clk_data {
> +	void __iomem *base;
> +};
> +
> +#endif /* __CLK_ST_H */
> 


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Akshu Agrawal May 15, 2018, 9:39 a.m. UTC | #3
On 5/15/2018 3:02 PM, Rafael J. Wysocki wrote:
> On Wednesday, May 9, 2018 11:59:00 AM CEST Akshu Agrawal wrote:
>> Stoney SoC provides oscout clock. This clock can support 25Mhz and
>> 48Mhz of frequency.
>> The clock is available for general system use.
>>
>> Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
> 
> I'm not sure if the Stephen Boyd's comments on one of the previous
> versions of this patch have been addressed.  Have they?
> 
> In any case, if I'm expected to take this, I need an ACK from Stephen on it.
> 
> Thanks,
> Rafael
> 

All comments of Stephen Boyd and Daniel Kurtz have been addressed.

Stephen, if you are Ok with this can you please ACK it.

Thanks,
Akshu
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Stephen Boyd May 15, 2018, 9:11 p.m. UTC | #4
Quoting Akshu Agrawal (2018-05-09 02:59:00)
> Stoney SoC provides oscout clock. This clock can support 25Mhz and
> 48Mhz of frequency.
> The clock is available for general system use.
> 
> Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
> ---

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

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Stephen Boyd May 15, 2018, 9:14 p.m. UTC | #5
Quoting Agrawal, Akshu (2018-05-15 02:39:08)
> 
> 
> On 5/15/2018 3:02 PM, Rafael J. Wysocki wrote:
> > On Wednesday, May 9, 2018 11:59:00 AM CEST Akshu Agrawal wrote:
> >> Stoney SoC provides oscout clock. This clock can support 25Mhz and
> >> 48Mhz of frequency.
> >> The clock is available for general system use.
> >>
> >> Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
> > 
> > I'm not sure if the Stephen Boyd's comments on one of the previous
> > versions of this patch have been addressed.  Have they?
> > 
> > In any case, if I'm expected to take this, I need an ACK from Stephen on it.
> > 
> > Thanks,
> > Rafael
> > 
> 
> All comments of Stephen Boyd and Daniel Kurtz have been addressed.
> 
> Stephen, if you are Ok with this can you please ACK it.
> 

It could go via clk tree and meet up with the acpi patch in -next right?
I'm fine with it going through acpi path though so whichever way works.
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Rafael J. Wysocki May 16, 2018, 8:23 a.m. UTC | #6
On Tue, May 15, 2018 at 11:14 PM, Stephen Boyd <sboyd@kernel.org> wrote:
> Quoting Agrawal, Akshu (2018-05-15 02:39:08)
>>
>>
>> On 5/15/2018 3:02 PM, Rafael J. Wysocki wrote:
>> > On Wednesday, May 9, 2018 11:59:00 AM CEST Akshu Agrawal wrote:
>> >> Stoney SoC provides oscout clock. This clock can support 25Mhz and
>> >> 48Mhz of frequency.
>> >> The clock is available for general system use.
>> >>
>> >> Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
>> >
>> > I'm not sure if the Stephen Boyd's comments on one of the previous
>> > versions of this patch have been addressed.  Have they?
>> >
>> > In any case, if I'm expected to take this, I need an ACK from Stephen on it.
>> >
>> > Thanks,
>> > Rafael
>> >
>>
>> All comments of Stephen Boyd and Daniel Kurtz have been addressed.
>>
>> Stephen, if you are Ok with this can you please ACK it.
>>
>
> It could go via clk tree and meet up with the acpi patch in -next right?
> I'm fine with it going through acpi path though so whichever way works.

It's better if it goes in as a series IMO and then if it goes via
ACPI, the clock dependency will be clear from the git history.

So if you don't mind, I'll queue this series up for 4.18.

Thanks,
Rafael
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Stephen Boyd May 16, 2018, 9:18 p.m. UTC | #7
Quoting Rafael J. Wysocki (2018-05-16 01:23:27)
> On Tue, May 15, 2018 at 11:14 PM, Stephen Boyd <sboyd@kernel.org> wrote:
> > Quoting Agrawal, Akshu (2018-05-15 02:39:08)
> >>
> >>
> >> On 5/15/2018 3:02 PM, Rafael J. Wysocki wrote:
> >> > On Wednesday, May 9, 2018 11:59:00 AM CEST Akshu Agrawal wrote:
> >> >> Stoney SoC provides oscout clock. This clock can support 25Mhz and
> >> >> 48Mhz of frequency.
> >> >> The clock is available for general system use.
> >> >>
> >> >> Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
> >> >
> >> > I'm not sure if the Stephen Boyd's comments on one of the previous
> >> > versions of this patch have been addressed.  Have they?
> >> >
> >> > In any case, if I'm expected to take this, I need an ACK from Stephen on it.
> >> >
> >> > Thanks,
> >> > Rafael
> >> >
> >>
> >> All comments of Stephen Boyd and Daniel Kurtz have been addressed.
> >>
> >> Stephen, if you are Ok with this can you please ACK it.
> >>
> >
> > It could go via clk tree and meet up with the acpi patch in -next right?
> > I'm fine with it going through acpi path though so whichever way works.
> 
> It's better if it goes in as a series IMO and then if it goes via
> ACPI, the clock dependency will be clear from the git history.
> 
> So if you don't mind, I'll queue this series up for 4.18.
> 

Ok
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diff mbox

Patch

diff --git a/drivers/clk/x86/Makefile b/drivers/clk/x86/Makefile
index 1367afb..00303bc 100644
--- a/drivers/clk/x86/Makefile
+++ b/drivers/clk/x86/Makefile
@@ -1,3 +1,4 @@ 
+obj-$(CONFIG_PMC_ATOM)		+= clk-pmc-atom.o
+obj-$(CONFIG_X86_AMD_PLATFORM_DEVICE)	+= clk-st.o
 clk-x86-lpss-objs		:= clk-lpt.o
 obj-$(CONFIG_X86_INTEL_LPSS)	+= clk-x86-lpss.o
-obj-$(CONFIG_PMC_ATOM)		+= clk-pmc-atom.o
diff --git a/drivers/clk/x86/clk-st.c b/drivers/clk/x86/clk-st.c
new file mode 100644
index 0000000..fb62f39
--- /dev/null
+++ b/drivers/clk/x86/clk-st.c
@@ -0,0 +1,77 @@ 
+// SPDX-License-Identifier: MIT
+/*
+ * clock framework for AMD Stoney based clocks
+ *
+ * Copyright 2018 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/platform_data/clk-st.h>
+#include <linux/platform_device.h>
+
+/* Clock Driving Strength 2 register */
+#define CLKDRVSTR2	0x28
+/* Clock Control 1 register */
+#define MISCCLKCNTL1	0x40
+/* Auxiliary clock1 enable bit */
+#define OSCCLKENB	2
+/* 25Mhz auxiliary output clock freq bit */
+#define OSCOUT1CLK25MHZ	16
+
+#define ST_CLK_48M	0
+#define ST_CLK_25M	1
+#define ST_CLK_MUX	2
+#define ST_CLK_GATE	3
+#define ST_MAX_CLKS	4
+
+static const char * const clk_oscout1_parents[] = { "clk48MHz", "clk25MHz" };
+static struct clk_hw *hws[ST_MAX_CLKS];
+
+static int st_clk_probe(struct platform_device *pdev)
+{
+	struct st_clk_data *st_data;
+
+	st_data = dev_get_platdata(&pdev->dev);
+	if (!st_data || !st_data->base)
+		return -EINVAL;
+
+	hws[ST_CLK_48M] = clk_hw_register_fixed_rate(NULL, "clk48MHz", NULL, 0,
+						     48000000);
+	hws[ST_CLK_25M] = clk_hw_register_fixed_rate(NULL, "clk25MHz", NULL, 0,
+						     25000000);
+
+	hws[ST_CLK_MUX] = clk_hw_register_mux(NULL, "oscout1_mux",
+		clk_oscout1_parents, ARRAY_SIZE(clk_oscout1_parents),
+		0, st_data->base + CLKDRVSTR2, OSCOUT1CLK25MHZ, 3, 0, NULL);
+
+	clk_set_parent(hws[ST_CLK_MUX]->clk, hws[ST_CLK_25M]->clk);
+
+	hws[ST_CLK_GATE] = clk_hw_register_gate(NULL, "oscout1", "oscout1_mux",
+		0, st_data->base + MISCCLKCNTL1, OSCCLKENB,
+		CLK_GATE_SET_TO_DISABLE, NULL);
+
+	clk_hw_register_clkdev(hws[ST_CLK_GATE], "oscout1", NULL);
+
+	return 0;
+}
+
+static int st_clk_remove(struct platform_device *pdev)
+{
+	int i;
+
+	for (i = 0; i < ST_MAX_CLKS; i++)
+		clk_hw_unregister(hws[i]);
+	return 0;
+}
+
+static struct platform_driver st_clk_driver = {
+	.driver = {
+		.name = "clk-st",
+		.suppress_bind_attrs = true,
+	},
+	.probe = st_clk_probe,
+	.remove = st_clk_remove,
+};
+builtin_platform_driver(st_clk_driver);
diff --git a/include/linux/platform_data/clk-st.h b/include/linux/platform_data/clk-st.h
new file mode 100644
index 0000000..7cdb6a4
--- /dev/null
+++ b/include/linux/platform_data/clk-st.h
@@ -0,0 +1,17 @@ 
+/* SPDX-License-Identifier: MIT */
+/*
+ * clock framework for AMD Stoney based clock
+ *
+ * Copyright 2018 Advanced Micro Devices, Inc.
+ */
+
+#ifndef __CLK_ST_H
+#define __CLK_ST_H
+
+#include <linux/compiler.h>
+
+struct st_clk_data {
+	void __iomem *base;
+};
+
+#endif /* __CLK_ST_H */