[PATCH 0/8] clk: max77686: Clock provider implementation fixes

[PATCH 0/8] clk: max77686: Clock provider implementation fixes

[Tomasz Figa]

This series intends to improve clock provider impementation of max77686
PMIC driver. First two patches are simple fixes of current implementation
to allow correct control of provided clocks. Further patches refactor
the driver to make the code cleaner and prepare for further patches. Then
last two patches add registration of OF clock provider and adjust device
tree nodes of boards containing max77686 chip to contain properties
required by clock provider.

Tested on Exynos4412-based Trats2 board, with additional patches adding
driver being a consumer of one of max77686 clocks.

Tomasz Figa (8):
  clk: max77686: Correct callback used for checking clock status
  clk: max77686: Provide .recalc_rate() operation
  clk: max77686: Refactor successful exit of probe function
  clk: max77686: Make max77686_clk_register() return struct clk *
  clk: max77686: Fix clean-up in error and remove paths
  clk: max77686: Refactor driver data handling
  clk: max77686: Register OF clock provider
  ARM: dts: Add clock provider specific properties to max77686 node

 .../devicetree/bindings/clock/maxim,max77686.txt   | 38 +++++++++
 Documentation/devicetree/bindings/mfd/max77686.txt |  3 +
 arch/arm/boot/dts/cros5250-common.dtsi             |  1 +
 arch/arm/boot/dts/exynos4412-odroidx.dts           |  1 +
 arch/arm/boot/dts/exynos4412-trats2.dts            |  1 +
 drivers/clk/clk-max77686.c                         | 97 +++++++++++++---------
 6 files changed, 104 insertions(+), 37 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/clock/maxim,max77686.txt

-- 
1.8.3.2

[PATCH 1/8] clk: max77686: Correct callback used for checking clock status

[Tomasz Figa]

Changing status of clock gates in max77686 requires i2c transfers, which
can sleep, so this is done in prepare and unprepare callbacks. Due to
this, checking whether whether the clock is ungated must be done
in is_prepared() callback as well, for consistency.

Signed-off-by: Tomasz Figa <t.figa-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Kyungmin Park <kyungmin.park-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
---
 drivers/clk/clk-max77686.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-max77686.c b/drivers/clk/clk-max77686.c
index 9f57bc3..e39d463 100644
--- a/drivers/clk/clk-max77686.c
+++ b/drivers/clk/clk-max77686.c
@@ -66,7 +66,7 @@ static void max77686_clk_unprepare(struct clk_hw *hw)
 		MAX77686_REG_32KHZ, max77686->mask, ~max77686->mask);
 }
 
-static int max77686_clk_is_enabled(struct clk_hw *hw)
+static int max77686_clk_is_prepared(struct clk_hw *hw)
 {
 	struct max77686_clk *max77686 = to_max77686_clk(hw);
 	int ret;
@@ -84,7 +84,7 @@ static int max77686_clk_is_enabled(struct clk_hw *hw)
 static struct clk_ops max77686_clk_ops = {
 	.prepare	= max77686_clk_prepare,
 	.unprepare	= max77686_clk_unprepare,
-	.is_enabled	= max77686_clk_is_enabled,
+	.is_prepared	= max77686_clk_is_prepared,
 };
 
 static struct clk_init_data max77686_clks_init[MAX77686_CLKS_NUM] = {
-- 
1.8.3.2

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[PATCH 2/8] clk: max77686: Provide .recalc_rate() operation

[Tomasz Figa]

It is usually nice to know frequency of a clock, so this patch adds a
.recalc_rate() callback returning rates of provided clocks.

Signed-off-by: Tomasz Figa <t.figa-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Kyungmin Park <kyungmin.park-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
---
 drivers/clk/clk-max77686.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/clk/clk-max77686.c b/drivers/clk/clk-max77686.c
index e39d463..e40ecdb 100644
--- a/drivers/clk/clk-max77686.c
+++ b/drivers/clk/clk-max77686.c
@@ -81,10 +81,17 @@ static int max77686_clk_is_prepared(struct clk_hw *hw)
 	return val & max77686->mask;
 }
 
+static unsigned long max77686_recalc_rate(struct clk_hw *hw,
+					  unsigned long parent_rate)
+{
+	return 32768;
+}
+
 static struct clk_ops max77686_clk_ops = {
 	.prepare	= max77686_clk_prepare,
 	.unprepare	= max77686_clk_unprepare,
 	.is_prepared	= max77686_clk_is_prepared,
+	.recalc_rate	= max77686_recalc_rate,
 };
 
 static struct clk_init_data max77686_clks_init[MAX77686_CLKS_NUM] = {
-- 
1.8.3.2

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[PATCH 3/8] clk: max77686: Refactor successful exit of probe function

[Tomasz Figa]

The function can simply return 0, without jumping to a separate label,
which does exactly the same. This patch does not introduce any
functional change, just a clean-up.

Signed-off-by: Tomasz Figa <t.figa-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Kyungmin Park <kyungmin.park-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
---
 drivers/clk/clk-max77686.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/clk/clk-max77686.c b/drivers/clk/clk-max77686.c
index e40ecdb..5d78460 100644
--- a/drivers/clk/clk-max77686.c
+++ b/drivers/clk/clk-max77686.c
@@ -178,7 +178,7 @@ static int max77686_clk_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, max77686_clks);
 
-	goto out;
+	return 0;
 
 err_clk_pmic:
 	clkdev_drop(max77686_clks[MAX77686_CLK_CP]->lookup);
@@ -187,7 +187,6 @@ err_clk_cp:
 	clkdev_drop(max77686_clks[MAX77686_CLK_AP]->lookup);
 	kfree(max77686_clks[MAX77686_CLK_AP]->hw.clk);
 err_clk_ap:
-out:
 	return ret;
 }
 
-- 
1.8.3.2

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Re: [PATCH 3/8] clk: max77686: Refactor successful exit of probe function

[Sachin Kamat]

Hi Tomasz,

On 17 October 2013 22:00, Tomasz Figa <t.figa@samsung.com> wrote:
> The function can simply return 0, without jumping to a separate label,
> which does exactly the same. This patch does not introduce any
> functional change, just a clean-up.
>
> Signed-off-by: Tomasz Figa <t.figa@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
> ---
>  drivers/clk/clk-max77686.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/clk/clk-max77686.c b/drivers/clk/clk-max77686.c
> index e40ecdb..5d78460 100644
> --- a/drivers/clk/clk-max77686.c
> +++ b/drivers/clk/clk-max77686.c
> @@ -178,7 +178,7 @@ static int max77686_clk_probe(struct platform_device *pdev)
>
>         platform_set_drvdata(pdev, max77686_clks);
>
> -       goto out;
> +       return 0;
>
>  err_clk_pmic:
>         clkdev_drop(max77686_clks[MAX77686_CLK_CP]->lookup);
> @@ -187,7 +187,6 @@ err_clk_cp:
>         clkdev_drop(max77686_clks[MAX77686_CLK_AP]->lookup);
>         kfree(max77686_clks[MAX77686_CLK_AP]->hw.clk);
>  err_clk_ap:

You could probably do the same for this label too.

> -out:
>         return ret;
>  }
>

-- 
With warm regards,
Sachin

[PATCH 4/8] clk: max77686: Make max77686_clk_register() return struct clk *

[Tomasz Figa]

As a preparation for further patches, this patch modifies the clock
registration helper function to return a pointer to the newly registered
clock. No functional change is done to the driver.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/clk/clk-max77686.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/clk/clk-max77686.c b/drivers/clk/clk-max77686.c
index 5d78460..2e6ba0e 100644
--- a/drivers/clk/clk-max77686.c
+++ b/drivers/clk/clk-max77686.c
@@ -112,27 +112,26 @@ static struct clk_init_data max77686_clks_init[MAX77686_CLKS_NUM] = {
 	},
 };
 
-static int max77686_clk_register(struct device *dev,
+static struct clk *max77686_clk_register(struct device *dev,
 				struct max77686_clk *max77686)
 {
 	struct clk *clk;
 	struct clk_hw *hw = &max77686->hw;
 
 	clk = clk_register(dev, hw);
-
 	if (IS_ERR(clk))
-		return -ENOMEM;
+		return clk;
 
 	max77686->lookup = kzalloc(sizeof(struct clk_lookup), GFP_KERNEL);
 	if (!max77686->lookup)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	max77686->lookup->con_id = hw->init->name;
 	max77686->lookup->clk = clk;
 
 	clkdev_add(max77686->lookup);
 
-	return 0;
+	return clk;
 }
 
 static int max77686_clk_probe(struct platform_device *pdev)
@@ -154,12 +153,16 @@ static int max77686_clk_probe(struct platform_device *pdev)
 	}
 
 	for (i = 0; i < MAX77686_CLKS_NUM; i++) {
+		struct clk *clk;
+
 		max77686_clks[i]->iodev = iodev;
 		max77686_clks[i]->mask = 1 << i;
 		max77686_clks[i]->hw.init = &max77686_clks_init[i];
 
-		ret = max77686_clk_register(&pdev->dev, max77686_clks[i]);
-		if (ret) {
+		clk = max77686_clk_register(&pdev->dev, max77686_clks[i]);
+		if (IS_ERR(clk)) {
+			ret = PTR_ERR(clk);
+
 			switch (i) {
 			case MAX77686_CLK_AP:
 				dev_err(&pdev->dev, "Fail to register CLK_AP\n");
-- 
1.8.3.2

[PATCH 5/8] clk: max77686: Fix clean-up in error and remove paths

[Tomasz Figa]

This patch fixes invalid kfree() and adds missing call to clk_unregister()
in error and remove paths in max77686_clk_probe(). While at it, error
handling is also cleaned up.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/clk/clk-max77686.c | 32 ++++++++++----------------------
 1 file changed, 10 insertions(+), 22 deletions(-)

diff --git a/drivers/clk/clk-max77686.c b/drivers/clk/clk-max77686.c
index 2e6ba0e..81b3680 100644
--- a/drivers/clk/clk-max77686.c
+++ b/drivers/clk/clk-max77686.c
@@ -162,20 +162,9 @@ static int max77686_clk_probe(struct platform_device *pdev)
 		clk = max77686_clk_register(&pdev->dev, max77686_clks[i]);
 		if (IS_ERR(clk)) {
 			ret = PTR_ERR(clk);
-
-			switch (i) {
-			case MAX77686_CLK_AP:
-				dev_err(&pdev->dev, "Fail to register CLK_AP\n");
-				goto err_clk_ap;
-				break;
-			case MAX77686_CLK_CP:
-				dev_err(&pdev->dev, "Fail to register CLK_CP\n");
-				goto err_clk_cp;
-				break;
-			case MAX77686_CLK_PMIC:
-				dev_err(&pdev->dev, "Fail to register CLK_PMIC\n");
-				goto err_clk_pmic;
-			}
+			dev_err(&pdev->dev, "failed to register %s\n",
+				max77686_clks[i]->hw.init->name);
+			goto err_clocks;
 		}
 	}
 
@@ -183,13 +172,12 @@ static int max77686_clk_probe(struct platform_device *pdev)
 
 	return 0;
 
-err_clk_pmic:
-	clkdev_drop(max77686_clks[MAX77686_CLK_CP]->lookup);
-	kfree(max77686_clks[MAX77686_CLK_CP]->hw.clk);
-err_clk_cp:
-	clkdev_drop(max77686_clks[MAX77686_CLK_AP]->lookup);
-	kfree(max77686_clks[MAX77686_CLK_AP]->hw.clk);
-err_clk_ap:
+err_clocks:
+	for (--i; i >= 0; --i) {
+		clkdev_drop(max77686_clks[i]->lookup);
+		clk_unregister(max77686_clks[i]->hw.clk);
+	}
+
 	return ret;
 }
 
@@ -200,7 +188,7 @@ static int max77686_clk_remove(struct platform_device *pdev)
 
 	for (i = 0; i < MAX77686_CLKS_NUM; i++) {
 		clkdev_drop(max77686_clks[i]->lookup);
-		kfree(max77686_clks[i]->hw.clk);
+		clk_unregister(max77686_clks[i]->hw.clk);
 	}
 	return 0;
 }
-- 
1.8.3.2

[PATCH 6/8] clk: max77686: Refactor driver data handling

[Tomasz Figa]

As a prerequisite for further patch adding OF clock provider support to
the driver, this patch changes the driver to store an array of struct
clk * as driver data.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/clk/clk-max77686.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/clk/clk-max77686.c b/drivers/clk/clk-max77686.c
index 81b3680..3cf38dc 100644
--- a/drivers/clk/clk-max77686.c
+++ b/drivers/clk/clk-max77686.c
@@ -137,12 +137,13 @@ static struct clk *max77686_clk_register(struct device *dev,
 static int max77686_clk_probe(struct platform_device *pdev)
 {
 	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
-	struct max77686_clk **max77686_clks;
+	struct max77686_clk *max77686_clks[MAX77686_CLKS_NUM];
+	struct clk **clocks;
 	int i, ret;
 
-	max77686_clks = devm_kzalloc(&pdev->dev, sizeof(struct max77686_clk *)
+	clocks = devm_kzalloc(&pdev->dev, sizeof(struct clk *)
 					* MAX77686_CLKS_NUM, GFP_KERNEL);
-	if (!max77686_clks)
+	if (!clocks)
 		return -ENOMEM;
 
 	for (i = 0; i < MAX77686_CLKS_NUM; i++) {
@@ -153,22 +154,20 @@ static int max77686_clk_probe(struct platform_device *pdev)
 	}
 
 	for (i = 0; i < MAX77686_CLKS_NUM; i++) {
-		struct clk *clk;
-
 		max77686_clks[i]->iodev = iodev;
 		max77686_clks[i]->mask = 1 << i;
 		max77686_clks[i]->hw.init = &max77686_clks_init[i];
 
-		clk = max77686_clk_register(&pdev->dev, max77686_clks[i]);
-		if (IS_ERR(clk)) {
-			ret = PTR_ERR(clk);
+		clocks[i] = max77686_clk_register(&pdev->dev, max77686_clks[i]);
+		if (IS_ERR(clocks[i])) {
+			ret = PTR_ERR(clocks[i]);
 			dev_err(&pdev->dev, "failed to register %s\n",
 				max77686_clks[i]->hw.init->name);
 			goto err_clocks;
 		}
 	}
 
-	platform_set_drvdata(pdev, max77686_clks);
+	platform_set_drvdata(pdev, clocks);
 
 	return 0;
 
@@ -183,12 +182,15 @@ err_clocks:
 
 static int max77686_clk_remove(struct platform_device *pdev)
 {
-	struct max77686_clk **max77686_clks = platform_get_drvdata(pdev);
+	struct clk **clocks = platform_get_drvdata(pdev);
 	int i;
 
 	for (i = 0; i < MAX77686_CLKS_NUM; i++) {
-		clkdev_drop(max77686_clks[i]->lookup);
-		clk_unregister(max77686_clks[i]->hw.clk);
+		struct clk_hw *hw = __clk_get_hw(clocks[i]);
+		struct max77686_clk *max77686 = to_max77686_clk(hw);
+
+		clkdev_drop(max77686->lookup);
+		clk_unregister(clocks[i]);
 	}
 	return 0;
 }
-- 
1.8.3.2

[PATCH 7/8] clk: max77686: Register OF clock provider

[Tomasz Figa]

If max77686 chip is instantiated from device tree, it is desirable to
have an OF clock provider to allow device tree based look-up of clocks.
This patch adds OF clock provider registration to the clk-max77686
driver.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 .../devicetree/bindings/clock/maxim,max77686.txt   | 38 ++++++++++++++++++++++
 Documentation/devicetree/bindings/mfd/max77686.txt |  3 ++
 drivers/clk/clk-max77686.c                         | 24 ++++++++++++++
 3 files changed, 65 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/maxim,max77686.txt

diff --git a/Documentation/devicetree/bindings/clock/maxim,max77686.txt b/Documentation/devicetree/bindings/clock/maxim,max77686.txt
new file mode 100644
index 0000000..96ce71b
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/maxim,max77686.txt
@@ -0,0 +1,38 @@
+Binding for Maxim MAX77686 32k clock generator block
+
+This is a part of device tree bindings of MAX77686 multi-function device.
+More information can be found in bindings/mfd/max77686.txt file.
+
+The MAX77686 contains three 32.768khz clock outputs that can be controlled
+(gated/ungated) over I2C.
+
+Following properties should be presend in main device node of the MFD chip.
+
+Required properties:
+- #clock-cells: simple one-cell clock specifier format is used, where the
+  only cell is used as an index of the clock inside the provider. Following
+  indices are allowed:
+    - 0: 32khz_ap clock,
+    - 1: 32khz_cp clock,
+    - 2: 32khz_pmic clock.
+
+Example: Node of the MFD chip
+
+	max77686: max77686@09 {
+		compatible = "maxim,max77686";
+		interrupt-parent = <&wakeup_eint>;
+		interrupts = <26 0>;
+		reg = <0x09>;
+		#clock-cells = <1>;
+
+		/* ... */
+	};
+
+Example: Clock consumer node
+
+	foo@0 {
+		compatible = "bar,foo";
+		/* ... */
+		clock-names = "my-clock";
+		clocks = <&max77686 2>;
+	};
diff --git a/Documentation/devicetree/bindings/mfd/max77686.txt b/Documentation/devicetree/bindings/mfd/max77686.txt
index c6a3469..678f3cf 100644
--- a/Documentation/devicetree/bindings/mfd/max77686.txt
+++ b/Documentation/devicetree/bindings/mfd/max77686.txt
@@ -7,6 +7,9 @@ different i2c slave address,presently for which we are statically creating i2c
 client while probing.This document describes the binding for mfd device and
 PMIC submodule.
 
+Binding for the built-in 32k clock generator block is defined separately
+in bindings/clk/maxim,max77686.txt file.
+
 Required properties:
 - compatible : Must be "maxim,max77686";
 - reg : Specifies the i2c slave address of PMIC block.
diff --git a/drivers/clk/clk-max77686.c b/drivers/clk/clk-max77686.c
index 3cf38dc..3d7e8dd 100644
--- a/drivers/clk/clk-max77686.c
+++ b/drivers/clk/clk-max77686.c
@@ -169,6 +169,26 @@ static int max77686_clk_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, clocks);
 
+	if (iodev->dev->of_node) {
+		struct clk_onecell_data *of_data;
+
+		of_data = devm_kzalloc(&pdev->dev,
+					sizeof(*of_data), GFP_KERNEL);
+		if (!of_data) {
+			ret = -ENOMEM;
+			goto err_clocks;
+		}
+
+		of_data->clks = clocks;
+		of_data->clk_num = MAX77686_CLKS_NUM;
+		ret = of_clk_add_provider(iodev->dev->of_node,
+					of_clk_src_onecell_get, of_data);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to register OF clock provider\n");
+			goto err_clocks;
+		}
+	}
+
 	return 0;
 
 err_clocks:
@@ -182,9 +202,13 @@ err_clocks:
 
 static int max77686_clk_remove(struct platform_device *pdev)
 {
+	struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct clk **clocks = platform_get_drvdata(pdev);
 	int i;
 
+	if (iodev->dev->of_node)
+		of_clk_del_provider(iodev->dev->of_node);
+
 	for (i = 0; i < MAX77686_CLKS_NUM; i++) {
 		struct clk_hw *hw = __clk_get_hw(clocks[i]);
 		struct max77686_clk *max77686 = to_max77686_clk(hw);
-- 
1.8.3.2

[PATCH 8/8] ARM: dts: Add clock provider specific properties to max77686 node

[Tomasz Figa]

This patch adds a label and #clock-cells property to device node of
max77686 PMIC to allow using it as a clock provider.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 arch/arm/boot/dts/cros5250-common.dtsi   | 1 +
 arch/arm/boot/dts/exynos4412-odroidx.dts | 1 +
 arch/arm/boot/dts/exynos4412-trats2.dts  | 1 +
 3 files changed, 3 insertions(+)

diff --git a/arch/arm/boot/dts/cros5250-common.dtsi b/arch/arm/boot/dts/cros5250-common.dtsi
index dc259e8b..c33a01e 100644
--- a/arch/arm/boot/dts/cros5250-common.dtsi
+++ b/arch/arm/boot/dts/cros5250-common.dtsi
@@ -36,6 +36,7 @@
 		max77686@09 {
 			compatible = "maxim,max77686";
 			reg = <0x09>;
+			#clock-cells = <1>;
 
 			voltage-regulators {
 				ldo1_reg: LDO1 {
diff --git a/arch/arm/boot/dts/exynos4412-odroidx.dts b/arch/arm/boot/dts/exynos4412-odroidx.dts
index 46c678e..8d337cc 100644
--- a/arch/arm/boot/dts/exynos4412-odroidx.dts
+++ b/arch/arm/boot/dts/exynos4412-odroidx.dts
@@ -119,6 +119,7 @@
 		max77686: pmic@09 {
 			compatible = "maxim,max77686";
 			reg = <0x09>;
+			#clock-cells = <1>;
 
 			voltage-regulators {
 				ldo1_reg: LDO1 {
diff --git a/arch/arm/boot/dts/exynos4412-trats2.dts b/arch/arm/boot/dts/exynos4412-trats2.dts
index fb7b9ae..c21a8b9 100644
--- a/arch/arm/boot/dts/exynos4412-trats2.dts
+++ b/arch/arm/boot/dts/exynos4412-trats2.dts
@@ -139,6 +139,7 @@
 			interrupt-parent = <&gpx0>;
 			interrupts = <7 0>;
 			reg = <0x09>;
+			#clock-cells = <1>;
 
 			voltage-regulators {
 				ldo1_reg: ldo1 {
-- 
1.8.3.2