[PATCH v3 5/5] Clk: RK808: Add clkout driver for RK808

[PATCH v3 5/5] Clk: RK808: Add clkout driver for RK808

[Chris Zhong]

Signed-off-by: Chris Zhong <zyw@rock-chips.com>

---

Changes in v4:
Advices by Doug
- add a "#clock-cells" propertiy
- update the example

Changes in v3: None
Changes in v2: None

 drivers/clk/Kconfig                        |    9 ++
 drivers/clk/Makefile                       |    1 +
 drivers/clk/clk-rk808.c                    |  162 ++++++++++++++++++++++++++++
 include/dt-bindings/clock/rockchip,rk808.h |   11 ++
 4 files changed, 183 insertions(+)
 create mode 100644 drivers/clk/clk-rk808.c
 create mode 100644 include/dt-bindings/clock/rockchip,rk808.h

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index cfd3af7..84e0590 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -38,6 +38,15 @@ config COMMON_CLK_MAX77686
 	---help---
 	  This driver supports Maxim 77686 crystal oscillator clock. 
 
+config COMMON_CLK_RK808
+	tristate "Clock driver for RK808"
+	depends on MFD_RK808
+	---help---
+	  This driver supports RK808 crystal oscillator clock. These
+	  multi-function devices have two fixed-rate oscillators,
+	  clocked at 32KHz each. Clkout1 is always on, Clkout2 can off
+	  by control register.
+
 config COMMON_CLK_SI5351
 	tristate "Clock driver for SiLabs 5351A/B/C"
 	depends on I2C
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index f537a0b..99f53d5 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_ARCH_NOMADIK)		+= clk-nomadik.o
 obj-$(CONFIG_ARCH_NSPIRE)		+= clk-nspire.o
 obj-$(CONFIG_COMMON_CLK_PALMAS)		+= clk-palmas.o
 obj-$(CONFIG_CLK_PPC_CORENET)		+= clk-ppc-corenet.o
+obj-$(CONFIG_COMMON_CLK_RK808)		+= clk-rk808.o
 obj-$(CONFIG_COMMON_CLK_S2MPS11)	+= clk-s2mps11.o
 obj-$(CONFIG_COMMON_CLK_SI5351)		+= clk-si5351.o
 obj-$(CONFIG_COMMON_CLK_SI570)		+= clk-si570.o
diff --git a/drivers/clk/clk-rk808.c b/drivers/clk/clk-rk808.c
new file mode 100644
index 0000000..50a25fc
--- /dev/null
+++ b/drivers/clk/clk-rk808.c
@@ -0,0 +1,162 @@
+/*
+ * Clkout driver for Rockchip RK808
+ *
+ * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Author: Chris Zhong <zyw@rock-chips.com>
+ * Author: Zhang Qing <zhangqing@rock-chips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/rk808.h>
+#include <linux/i2c.h>
+
+struct rk808_clkout {
+	struct rk808 *rk808;
+	struct clk_onecell_data clk_data;
+	struct clk_hw		clkout1_hw;
+	struct clk_hw		clkout2_hw;
+};
+
+static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
+					      unsigned long parent_rate)
+{
+	return 32768;
+}
+
+static int rk808_clkout1_is_prepared(struct clk_hw *hw)
+{
+	return 1;
+}
+
+static int rk808_clkout2_control(struct clk_hw *hw, bool enable)
+{
+	struct rk808_clkout *rk808_clkout = container_of(hw,
+							 struct rk808_clkout,
+							 clkout2_hw);
+	struct rk808 *rk808 = rk808_clkout->rk808;
+
+	return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
+				  CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
+}
+
+static int rk808_clkout2_prepare(struct clk_hw *hw)
+{
+	return rk808_clkout2_control(hw, 1);
+}
+
+static void rk808_clkout2_unprepare(struct clk_hw *hw)
+{
+	rk808_clkout2_control(hw, 0);
+}
+
+static int rk808_clkout2_is_prepared(struct clk_hw *hw)
+{
+	struct rk808_clkout *rk808_clkout = container_of(hw,
+							 struct rk808_clkout,
+							 clkout2_hw);
+	struct rk808 *rk808 = rk808_clkout->rk808;
+	uint32_t val;
+
+	int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
+
+	if (ret < 0)
+		return ret;
+
+	return (val & CLK32KOUT2_EN) ? 1 : 0;
+}
+
+static const struct clk_ops rk808_clkout1_ops = {
+	.is_prepared = rk808_clkout1_is_prepared,
+	.recalc_rate = rk808_clkout_recalc_rate,
+};
+
+static const struct clk_ops rk808_clkout2_ops = {
+	.prepare = rk808_clkout2_prepare,
+	.unprepare = rk808_clkout2_unprepare,
+	.is_prepared = rk808_clkout2_is_prepared,
+	.recalc_rate = rk808_clkout_recalc_rate,
+};
+
+static int rk808_clkout_probe(struct platform_device *pdev)
+{
+	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
+	struct i2c_client *client = rk808->i2c;
+	struct device_node *node = client->dev.of_node;
+	struct clk_init_data init;
+	struct clk **clk_table;
+	struct rk808_clkout *rk808_clkout;
+
+	rk808_clkout = devm_kzalloc(&client->dev,
+				    sizeof(*rk808_clkout), GFP_KERNEL);
+	if (!rk808_clkout)
+		return -ENOMEM;
+
+	rk808_clkout->rk808 = rk808;
+
+	clk_table = devm_kzalloc(&client->dev,
+				 2*sizeof(struct clk *), GFP_KERNEL);
+	if (!clk_table)
+		return -ENOMEM;
+
+	init.flags = CLK_IS_ROOT;
+	init.parent_names = NULL;
+	init.num_parents = 0;
+	init.name = "rk808-clkout1";
+	init.ops = &rk808_clkout1_ops;
+	rk808_clkout->clkout1_hw.init = &init;
+
+	/* optional override of the clockname */
+	of_property_read_string_index(node, "clock-output-names",
+				      0, &init.name);
+
+	clk_table[0] = devm_clk_register(&client->dev,
+					 &rk808_clkout->clkout1_hw);
+
+	init.name = "rk808-clkout2";
+	init.ops = &rk808_clkout2_ops;
+	rk808_clkout->clkout2_hw.init = &init;
+
+	/* optional override of the clockname */
+	of_property_read_string_index(node, "clock-output-names",
+				      1, &init.name);
+
+	clk_table[1] = devm_clk_register(&client->dev,
+					 &rk808_clkout->clkout2_hw);
+
+	rk808_clkout->clk_data.clks = clk_table;
+	rk808_clkout->clk_data.clk_num = 2;
+	of_clk_add_provider(node, of_clk_src_onecell_get, clk_table);
+
+	return 0;
+}
+
+static struct platform_driver rk808_clkout_driver = {
+	.probe = rk808_clkout_probe,
+	.driver		= {
+		.name	= "rk808-clkout",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(rk808_clkout_driver);
+
+MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
+MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
+MODULE_AUTHOR("Zhang Qing <zhanqging@rock-chips.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rk808-clkout");
diff --git a/include/dt-bindings/clock/rockchip,rk808.h b/include/dt-bindings/clock/rockchip,rk808.h
new file mode 100644
index 0000000..1a87343
--- /dev/null
+++ b/include/dt-bindings/clock/rockchip,rk808.h
@@ -0,0 +1,11 @@
+/*
+ * This header provides constants clk index RK808 pmic clkout
+ */
+#ifndef _CLK_ROCKCHIP_RK808
+#define _CLK_ROCKCHIP_RK808
+
+/* CLOCKOUT index */
+#define RK808_CLKOUT0		0
+#define RK808_CLKOUT1		1
+
+#endif
-- 
1.7.9.5

Re: [PATCH v3 5/5] Clk: RK808: Add clkout driver for RK808

[Doug Anderson]

Chris,

On Sat, Aug 23, 2014 at 4:07 AM, Chris Zhong <zyw@rock-chips.com> wrote:
> Signed-off-by: Chris Zhong <zyw@rock-chips.com>
>
> ---
>
> Changes in v4:

Wait, is this v4 or v3?  The subject line still says v3, which is confusing.


> Advices by Doug
> - add a "#clock-cells" propertiy
> - update the example
>
> Changes in v3: None
> Changes in v2: None
>
>  drivers/clk/Kconfig                        |    9 ++
>  drivers/clk/Makefile                       |    1 +
>  drivers/clk/clk-rk808.c                    |  162 ++++++++++++++++++++++++++++
>  include/dt-bindings/clock/rockchip,rk808.h |   11 ++
>  4 files changed, 183 insertions(+)
>  create mode 100644 drivers/clk/clk-rk808.c
>  create mode 100644 include/dt-bindings/clock/rockchip,rk808.h
>
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index cfd3af7..84e0590 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -38,6 +38,15 @@ config COMMON_CLK_MAX77686
>         ---help---
>           This driver supports Maxim 77686 crystal oscillator clock.
>
> +config COMMON_CLK_RK808
> +       tristate "Clock driver for RK808"
> +       depends on MFD_RK808
> +       ---help---
> +         This driver supports RK808 crystal oscillator clock. These
> +         multi-function devices have two fixed-rate oscillators,
> +         clocked at 32KHz each. Clkout1 is always on, Clkout2 can off
> +         by control register.
> +
>  config COMMON_CLK_SI5351
>         tristate "Clock driver for SiLabs 5351A/B/C"
>         depends on I2C
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index f537a0b..99f53d5 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -28,6 +28,7 @@ obj-$(CONFIG_ARCH_NOMADIK)            += clk-nomadik.o
>  obj-$(CONFIG_ARCH_NSPIRE)              += clk-nspire.o
>  obj-$(CONFIG_COMMON_CLK_PALMAS)                += clk-palmas.o
>  obj-$(CONFIG_CLK_PPC_CORENET)          += clk-ppc-corenet.o
> +obj-$(CONFIG_COMMON_CLK_RK808)         += clk-rk808.o
>  obj-$(CONFIG_COMMON_CLK_S2MPS11)       += clk-s2mps11.o
>  obj-$(CONFIG_COMMON_CLK_SI5351)                += clk-si5351.o
>  obj-$(CONFIG_COMMON_CLK_SI570)         += clk-si570.o
> diff --git a/drivers/clk/clk-rk808.c b/drivers/clk/clk-rk808.c
> new file mode 100644
> index 0000000..50a25fc
> --- /dev/null
> +++ b/drivers/clk/clk-rk808.c
> @@ -0,0 +1,162 @@
> +/*
> + * Clkout driver for Rockchip RK808
> + *
> + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
> + *
> + * Author: Chris Zhong <zyw@rock-chips.com>
> + * Author: Zhang Qing <zhangqing@rock-chips.com>

You have author below.  Why is it here, too?


> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#include <linux/mfd/rk808.h>
> +#include <linux/i2c.h>
> +
> +struct rk808_clkout {
> +       struct rk808 *rk808;
> +       struct clk_onecell_data clk_data;
> +       struct clk_hw           clkout1_hw;
> +       struct clk_hw           clkout2_hw;
> +};
> +
> +static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
> +                                             unsigned long parent_rate)
> +{
> +       return 32768;
> +}
> +
> +static int rk808_clkout1_is_prepared(struct clk_hw *hw)
> +{
> +       return 1;
> +}
> +
> +static int rk808_clkout2_control(struct clk_hw *hw, bool enable)
> +{
> +       struct rk808_clkout *rk808_clkout = container_of(hw,
> +                                                        struct rk808_clkout,
> +                                                        clkout2_hw);
> +       struct rk808 *rk808 = rk808_clkout->rk808;
> +
> +       return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
> +                                 CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
> +}
> +
> +static int rk808_clkout2_prepare(struct clk_hw *hw)
> +{
> +       return rk808_clkout2_control(hw, 1);
> +}
> +
> +static void rk808_clkout2_unprepare(struct clk_hw *hw)
> +{
> +       rk808_clkout2_control(hw, 0);
> +}
> +
> +static int rk808_clkout2_is_prepared(struct clk_hw *hw)
> +{
> +       struct rk808_clkout *rk808_clkout = container_of(hw,
> +                                                        struct rk808_clkout,
> +                                                        clkout2_hw);
> +       struct rk808 *rk808 = rk808_clkout->rk808;
> +       uint32_t val;
> +
> +       int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
> +
> +       if (ret < 0)
> +               return ret;
> +
> +       return (val & CLK32KOUT2_EN) ? 1 : 0;
> +}
> +
> +static const struct clk_ops rk808_clkout1_ops = {
> +       .is_prepared = rk808_clkout1_is_prepared,
> +       .recalc_rate = rk808_clkout_recalc_rate,
> +};
> +
> +static const struct clk_ops rk808_clkout2_ops = {
> +       .prepare = rk808_clkout2_prepare,
> +       .unprepare = rk808_clkout2_unprepare,
> +       .is_prepared = rk808_clkout2_is_prepared,
> +       .recalc_rate = rk808_clkout_recalc_rate,
> +};
> +
> +static int rk808_clkout_probe(struct platform_device *pdev)
> +{
> +       struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
> +       struct i2c_client *client = rk808->i2c;
> +       struct device_node *node = client->dev.of_node;
> +       struct clk_init_data init;

Seems safer to have "= {};" here.  Looks like you're initting
everything, but still...


> +       struct clk **clk_table;
> +       struct rk808_clkout *rk808_clkout;
> +
> +       rk808_clkout = devm_kzalloc(&client->dev,
> +                                   sizeof(*rk808_clkout), GFP_KERNEL);
> +       if (!rk808_clkout)
> +               return -ENOMEM;
> +
> +       rk808_clkout->rk808 = rk808;
> +
> +       clk_table = devm_kzalloc(&client->dev,
> +                                2*sizeof(struct clk *), GFP_KERNEL);
> +       if (!clk_table)
> +               return -ENOMEM;
> +
> +       init.flags = CLK_IS_ROOT;
> +       init.parent_names = NULL;
> +       init.num_parents = 0;
> +       init.name = "rk808-clkout1";
> +       init.ops = &rk808_clkout1_ops;
> +       rk808_clkout->clkout1_hw.init = &init;
> +
> +       /* optional override of the clockname */
> +       of_property_read_string_index(node, "clock-output-names",
> +                                     0, &init.name);
> +
> +       clk_table[0] = devm_clk_register(&client->dev,
> +                                        &rk808_clkout->clkout1_hw);

Check for error value here?


> +
> +       init.name = "rk808-clkout2";
> +       init.ops = &rk808_clkout2_ops;
> +       rk808_clkout->clkout2_hw.init = &init;
> +
> +       /* optional override of the clockname */
> +       of_property_read_string_index(node, "clock-output-names",
> +                                     1, &init.name);
> +
> +       clk_table[1] = devm_clk_register(&client->dev,
> +                                        &rk808_clkout->clkout2_hw);

Check for error here?


> +
> +       rk808_clkout->clk_data.clks = clk_table;
> +       rk808_clkout->clk_data.clk_num = 2;
> +       of_clk_add_provider(node, of_clk_src_onecell_get, clk_table);

Return the result of of_clk_add_provider() since it returns an error.


> +
> +       return 0;
> +}
> +
> +static struct platform_driver rk808_clkout_driver = {
> +       .probe = rk808_clkout_probe,
> +       .driver         = {
> +               .name   = "rk808-clkout",
> +               .owner  = THIS_MODULE,
> +       },
> +};
> +
> +module_platform_driver(rk808_clkout_driver);

I have this feeling that we're going to want this to be
subsys_initcall() because it's such a core component and that will
mean the MFD will need to be subsys_initcall() and that will mean that
the i2c needs to be subsys_initcall().  ...but then everyone will yell
that everything in the system is supposed to be module-level.  ...so I
guess we'll just leave it as module_platform_driver() for now...


> +MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
> +MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
> +MODULE_AUTHOR("Zhang Qing <zhanqging@rock-chips.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:rk808-clkout");
> diff --git a/include/dt-bindings/clock/rockchip,rk808.h b/include/dt-bindings/clock/rockchip,rk808.h

The "include/dt-bindings/clock/rockchip,rk808.h" file belongs in the
first patch.  It's part of the dt-bindings...


> new file mode 100644
> index 0000000..1a87343
> --- /dev/null
> +++ b/include/dt-bindings/clock/rockchip,rk808.h
> @@ -0,0 +1,11 @@
> +/*
> + * This header provides constants clk index RK808 pmic clkout
> + */
> +#ifndef _CLK_ROCKCHIP_RK808
> +#define _CLK_ROCKCHIP_RK808
> +
> +/* CLOCKOUT index */
> +#define RK808_CLKOUT0          0
> +#define RK808_CLKOUT1          1
> +
> +#endif
> --
> 1.7.9.5
>
>

[PATCH v3 5/5] Clk: RK808: Add clkout driver for RK808

[Chris Zhong]

Signed-off-by: Chris Zhong <zyw@rock-chips.com>

---

Changes in v3: None
Changes in v2: None

 drivers/clk/Kconfig     |    9 +++
 drivers/clk/Makefile    |    1 +
 drivers/clk/clk-rk808.c |  147 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 157 insertions(+)
 create mode 100644 drivers/clk/clk-rk808.c

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index cfd3af7..84e0590 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -38,6 +38,15 @@ config COMMON_CLK_MAX77686
 	---help---
 	  This driver supports Maxim 77686 crystal oscillator clock. 
 
+config COMMON_CLK_RK808
+	tristate "Clock driver for RK808"
+	depends on MFD_RK808
+	---help---
+	  This driver supports RK808 crystal oscillator clock. These
+	  multi-function devices have two fixed-rate oscillators,
+	  clocked at 32KHz each. Clkout1 is always on, Clkout2 can off
+	  by control register.
+
 config COMMON_CLK_SI5351
 	tristate "Clock driver for SiLabs 5351A/B/C"
 	depends on I2C
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index f537a0b..99f53d5 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_ARCH_NOMADIK)		+= clk-nomadik.o
 obj-$(CONFIG_ARCH_NSPIRE)		+= clk-nspire.o
 obj-$(CONFIG_COMMON_CLK_PALMAS)		+= clk-palmas.o
 obj-$(CONFIG_CLK_PPC_CORENET)		+= clk-ppc-corenet.o
+obj-$(CONFIG_COMMON_CLK_RK808)		+= clk-rk808.o
 obj-$(CONFIG_COMMON_CLK_S2MPS11)	+= clk-s2mps11.o
 obj-$(CONFIG_COMMON_CLK_SI5351)		+= clk-si5351.o
 obj-$(CONFIG_COMMON_CLK_SI570)		+= clk-si570.o
diff --git a/drivers/clk/clk-rk808.c b/drivers/clk/clk-rk808.c
new file mode 100644
index 0000000..14176bc
--- /dev/null
+++ b/drivers/clk/clk-rk808.c
@@ -0,0 +1,147 @@
+/*
+ * Clkout driver for Rockchip RK808
+ *
+ * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Author: Chris Zhong <zyw@rock-chips.com>
+ * Author: Zhang Qing <zhangqing@rock-chips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/rk808.h>
+#include <linux/i2c.h>
+
+struct rk808_clk {
+	struct rk808 *rk808;
+	struct clk_onecell_data clk_data;
+	struct clk_hw		clkout1_hw;
+	struct clk_hw		clkout2_hw;
+};
+
+static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
+					      unsigned long parent_rate)
+{
+	return 32768;
+}
+
+static int rk808_clkout1_is_prepared(struct clk_hw *hw)
+{
+	return 1;
+}
+
+static int rk808_clkout2_control(struct clk_hw *hw, bool enable)
+{
+	struct rk808_clk *rk808_clk = container_of(hw, struct rk808_clk,
+						   clkout2_hw);
+	struct rk808 *rk808 = rk808_clk->rk808;
+
+	return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
+				  CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
+}
+
+static int rk808_clkout2_prepare(struct clk_hw *hw)
+{
+	return rk808_clkout2_control(hw, 1);
+}
+
+static void rk808_clkout2_unprepare(struct clk_hw *hw)
+{
+	rk808_clkout2_control(hw, 0);
+}
+
+static int rk808_clkout2_is_prepared(struct clk_hw *hw)
+{
+	struct rk808_clk *rk808_clk = container_of(hw, struct rk808_clk,
+						   clkout2_hw);
+	struct rk808 *rk808 = rk808_clk->rk808;
+	uint32_t val;
+
+	int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
+
+	if (ret < 0)
+		return ret;
+
+	return (val & CLK32KOUT2_EN) ? 1 : 0;
+}
+
+static const struct clk_ops rk808_clkout1_ops = {
+	.is_prepared = rk808_clkout1_is_prepared,
+	.recalc_rate = rk808_clkout_recalc_rate,
+};
+
+static const struct clk_ops rk808_clkout2_ops = {
+	.prepare = rk808_clkout2_prepare,
+	.unprepare = rk808_clkout2_unprepare,
+	.is_prepared = rk808_clkout2_is_prepared,
+	.recalc_rate = rk808_clkout_recalc_rate,
+};
+
+static int rk808_clk_probe(struct platform_device *pdev)
+{
+	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
+	struct i2c_client *client = rk808->i2c;
+	struct device_node *node = client->dev.of_node;
+	struct clk_init_data init;
+	struct clk **clk_table;
+	struct rk808_clk *rk808_clk;
+
+	rk808_clk = devm_kzalloc(&pdev->dev, sizeof(*rk808_clk), GFP_KERNEL);
+	if (!rk808_clk)
+		return -ENOMEM;
+
+	rk808_clk->rk808 = rk808;
+
+	clk_table = devm_kzalloc(&client->dev,
+				 2*sizeof(struct clk *), GFP_KERNEL);
+	if (!clk_table)
+		return -ENOMEM;
+
+	init.flags = CLK_IS_ROOT;
+	init.parent_names = NULL;
+	init.num_parents = 0;
+	init.name = "rk808-clkout1";
+	init.ops = &rk808_clkout1_ops;
+	rk808_clk->clkout1_hw.init = &init;
+	clk_table[0] = devm_clk_register(&pdev->dev, &rk808_clk->clkout1_hw);
+
+	init.name = "rk808-clkout2";
+	init.ops = &rk808_clkout2_ops;
+	rk808_clk->clkout2_hw.init = &init;
+	clk_table[1] = devm_clk_register(&pdev->dev, &rk808_clk->clkout2_hw);
+
+	rk808_clk->clk_data.clks = clk_table;
+	rk808_clk->clk_data.clk_num = 2;
+	of_clk_add_provider(node, of_clk_src_onecell_get, clk_table);
+
+	return 0;
+}
+
+static struct platform_driver rk808_clk_driver = {
+	.probe = rk808_clk_probe,
+	.driver		= {
+		.name	= "rk808-clkout",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(rk808_clk_driver);
+
+MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
+MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
+MODULE_AUTHOR("Zhang Qing <zhanqging@rock-chips.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rk808-clk");
-- 
1.7.9.5