[PATCH v4 0/3] usb: renesas_usbhs: add reset_control and multiple clocks management

[PATCH v4 0/3] usb: renesas_usbhs: add reset_control and multiple clocks management

[Yoshihiro Shimoda]

This patch set is based on Felipe's usb.git / testing/next branch
(the commit id is 5b394b2ddf0347bef56e50c69a58773c94343ff3) with
the following patch:
  https://patchwork.kernel.org/patch/10574875/

Changes from v3:
 - Change the dt-bindings not to use clock-names in patch 2.
 - To achieve backward compatibility with old DT, the driver should get
   the first clock and the second clock is an optional.
 - Add "clk_put" calling in the remove function.

Changes from v2:
 - Use clk_bulk_enable_prepare() instead of two functions on patch 3/3.

Changes from v1:
 - Fix error path on patch 3/3.
 - Use clk_bulk_disable_unprepare() instead of two functions on patch 3/3.
 - Use staic array of struct clk_bulk_data instead of a pointer on patch 3/3.


Yoshihiro Shimoda (3):
  usb: renesas_usbhs: Add reset_control
  dt-bindings: usb: renesas_usbhs: add clock-names property
  usb: renesas_usbhs: Add multiple clocks management

 .../devicetree/bindings/usb/renesas_usbhs.txt      |   4 +-
 drivers/usb/renesas_usbhs/common.c                 | 100 +++++++++++++++++++++
 drivers/usb/renesas_usbhs/common.h                 |   4 +
 3 files changed, 107 insertions(+), 1 deletion(-)

-- 
1.9.1

[PATCH v4 1/3] usb: renesas_usbhs: Add reset_control

[Yoshihiro Shimoda]

R-Car Gen3 needs to deassert resets of both host and peripheral.
Since [eo]hci-platform is possible to assert the reset(s) when
the probing failed, renesas_usbhs driver doesn't work correctly
regardless of finished probing. To fix this issue, this patch adds
reset_control on this renesas_usbhs driver.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/usb/renesas_usbhs/common.c | 12 ++++++++++++
 drivers/usb/renesas_usbhs/common.h |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c
index 4310df4..1d355d5 100644
--- a/drivers/usb/renesas_usbhs/common.c
+++ b/drivers/usb/renesas_usbhs/common.c
@@ -12,6 +12,7 @@
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include "common.h"
@@ -574,6 +575,10 @@ static int usbhs_probe(struct platform_device *pdev)
 			return PTR_ERR(priv->edev);
 	}
 
+	priv->rsts = devm_reset_control_array_get_optional_shared(&pdev->dev);
+	if (IS_ERR(priv->rsts))
+		return PTR_ERR(priv->rsts);
+
 	/*
 	 * care platform info
 	 */
@@ -658,6 +663,10 @@ static int usbhs_probe(struct platform_device *pdev)
 	/* dev_set_drvdata should be called after usbhs_mod_init */
 	platform_set_drvdata(pdev, priv);
 
+	ret = reset_control_deassert(priv->rsts);
+	if (ret)
+		goto probe_fail_rst;
+
 	/*
 	 * deviece reset here because
 	 * USB device might be used in boot loader.
@@ -711,6 +720,8 @@ static int usbhs_probe(struct platform_device *pdev)
 	return ret;
 
 probe_end_mod_exit:
+	reset_control_assert(priv->rsts);
+probe_fail_rst:
 	usbhs_mod_remove(priv);
 probe_end_fifo_exit:
 	usbhs_fifo_remove(priv);
@@ -739,6 +750,7 @@ static int usbhs_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 
 	usbhs_platform_call(priv, hardware_exit, pdev);
+	reset_control_assert(priv->rsts);
 	usbhs_mod_remove(priv);
 	usbhs_fifo_remove(priv);
 	usbhs_pipe_remove(priv);
diff --git a/drivers/usb/renesas_usbhs/common.h b/drivers/usb/renesas_usbhs/common.h
index 6137f79..bce7d35 100644
--- a/drivers/usb/renesas_usbhs/common.h
+++ b/drivers/usb/renesas_usbhs/common.h
@@ -10,6 +10,7 @@
 
 #include <linux/extcon.h>
 #include <linux/platform_device.h>
+#include <linux/reset.h>
 #include <linux/usb/renesas_usbhs.h>
 
 struct usbhs_priv;
@@ -277,6 +278,7 @@ struct usbhs_priv {
 	struct usbhs_fifo_info fifo_info;
 
 	struct phy *phy;
+	struct reset_control *rsts;
 };
 
 /*
-- 
1.9.1

[v4,1/3] usb: renesas_usbhs: Add reset_control

[Yoshihiro Shimoda]

R-Car Gen3 needs to deassert resets of both host and peripheral.
Since [eo]hci-platform is possible to assert the reset(s) when
the probing failed, renesas_usbhs driver doesn't work correctly
regardless of finished probing. To fix this issue, this patch adds
reset_control on this renesas_usbhs driver.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/usb/renesas_usbhs/common.c | 12 ++++++++++++
 drivers/usb/renesas_usbhs/common.h |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c
index 4310df4..1d355d5 100644
--- a/drivers/usb/renesas_usbhs/common.c
+++ b/drivers/usb/renesas_usbhs/common.c
@@ -12,6 +12,7 @@
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include "common.h"
@@ -574,6 +575,10 @@ static int usbhs_probe(struct platform_device *pdev)
 			return PTR_ERR(priv->edev);
 	}
 
+	priv->rsts = devm_reset_control_array_get_optional_shared(&pdev->dev);
+	if (IS_ERR(priv->rsts))
+		return PTR_ERR(priv->rsts);
+
 	/*
 	 * care platform info
 	 */
@@ -658,6 +663,10 @@ static int usbhs_probe(struct platform_device *pdev)
 	/* dev_set_drvdata should be called after usbhs_mod_init */
 	platform_set_drvdata(pdev, priv);
 
+	ret = reset_control_deassert(priv->rsts);
+	if (ret)
+		goto probe_fail_rst;
+
 	/*
 	 * deviece reset here because
 	 * USB device might be used in boot loader.
@@ -711,6 +720,8 @@ static int usbhs_probe(struct platform_device *pdev)
 	return ret;
 
 probe_end_mod_exit:
+	reset_control_assert(priv->rsts);
+probe_fail_rst:
 	usbhs_mod_remove(priv);
 probe_end_fifo_exit:
 	usbhs_fifo_remove(priv);
@@ -739,6 +750,7 @@ static int usbhs_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 
 	usbhs_platform_call(priv, hardware_exit, pdev);
+	reset_control_assert(priv->rsts);
 	usbhs_mod_remove(priv);
 	usbhs_fifo_remove(priv);
 	usbhs_pipe_remove(priv);
diff --git a/drivers/usb/renesas_usbhs/common.h b/drivers/usb/renesas_usbhs/common.h
index 6137f79..bce7d35 100644
--- a/drivers/usb/renesas_usbhs/common.h
+++ b/drivers/usb/renesas_usbhs/common.h
@@ -10,6 +10,7 @@
 
 #include <linux/extcon.h>
 #include <linux/platform_device.h>
+#include <linux/reset.h>
 #include <linux/usb/renesas_usbhs.h>
 
 struct usbhs_priv;
@@ -277,6 +278,7 @@ struct usbhs_priv {
 	struct usbhs_fifo_info fifo_info;
 
 	struct phy *phy;
+	struct reset_control *rsts;
 };
 
 /*

[PATCH v4 2/3] dt-bindings: usb: renesas_usbhs: add clock-names property

[Yoshihiro Shimoda]

R-Car Gen3 needs to enable clocks of both host and peripheral.
Otherwise, other side device cannot work correctly. So, this patch
adds a property of clock-names for R-Car Gen3 as an optional.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 Documentation/devicetree/bindings/usb/renesas_usbhs.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
index 087140a..dbdb92c 100644
--- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
+++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
@@ -26,7 +26,9 @@ Required properties:
 
   - reg: Base address and length of the register for the USBHS
   - interrupts: Interrupt specifier for the USBHS
-  - clocks: A list of phandle + clock specifier pairs
+  - clocks: A list of phandle + clock specifier pairs. In case of
+	    "renesas,rcar-gen3-usbhs" compatible device, first clock should be
+	    peripheral and second one should be host.
 
 Optional properties:
   - renesas,buswait: Integer to use BUSWAIT register
-- 
1.9.1

[v4,2/3] dt-bindings: usb: renesas_usbhs: add clock-names property

[Yoshihiro Shimoda]

R-Car Gen3 needs to enable clocks of both host and peripheral.
Otherwise, other side device cannot work correctly. So, this patch
adds a property of clock-names for R-Car Gen3 as an optional.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 Documentation/devicetree/bindings/usb/renesas_usbhs.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
index 087140a..dbdb92c 100644
--- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
+++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
@@ -26,7 +26,9 @@ Required properties:
 
   - reg: Base address and length of the register for the USBHS
   - interrupts: Interrupt specifier for the USBHS
-  - clocks: A list of phandle + clock specifier pairs
+  - clocks: A list of phandle + clock specifier pairs. In case of
+	    "renesas,rcar-gen3-usbhs" compatible device, first clock should be
+	    peripheral and second one should be host.
 
 Optional properties:
   - renesas,buswait: Integer to use BUSWAIT register

Re: [PATCH v4 2/3] dt-bindings: usb: renesas_usbhs: add clock-names property

[Rob Herring]

On Mon, Sep 10, 2018 at 06:52:19PM +0900, Yoshihiro Shimoda wrote:
> R-Car Gen3 needs to enable clocks of both host and peripheral.
> Otherwise, other side device cannot work correctly. So, this patch
> adds a property of clock-names for R-Car Gen3 as an optional.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> ---
>  Documentation/devicetree/bindings/usb/renesas_usbhs.txt | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> index 087140a..dbdb92c 100644
> --- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> +++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> @@ -26,7 +26,9 @@ Required properties:
>  
>    - reg: Base address and length of the register for the USBHS
>    - interrupts: Interrupt specifier for the USBHS
> -  - clocks: A list of phandle + clock specifier pairs
> +  - clocks: A list of phandle + clock specifier pairs. In case of
> +	    "renesas,rcar-gen3-usbhs" compatible device, first clock should be
> +	    peripheral and second one should be host.

This should have said how many clocks. That's still not clear except for 
"renesas,rcar-gen3-usbhs".

Rob

[v4,2/3] dt-bindings: usb: renesas_usbhs: add clock-names property

[Rob Herring]

On Mon, Sep 10, 2018 at 06:52:19PM +0900, Yoshihiro Shimoda wrote:
> R-Car Gen3 needs to enable clocks of both host and peripheral.
> Otherwise, other side device cannot work correctly. So, this patch
> adds a property of clock-names for R-Car Gen3 as an optional.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> ---
>  Documentation/devicetree/bindings/usb/renesas_usbhs.txt | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> index 087140a..dbdb92c 100644
> --- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> +++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> @@ -26,7 +26,9 @@ Required properties:
>  
>    - reg: Base address and length of the register for the USBHS
>    - interrupts: Interrupt specifier for the USBHS
> -  - clocks: A list of phandle + clock specifier pairs
> +  - clocks: A list of phandle + clock specifier pairs. In case of
> +	    "renesas,rcar-gen3-usbhs" compatible device, first clock should be
> +	    peripheral and second one should be host.

This should have said how many clocks. That's still not clear except for 
"renesas,rcar-gen3-usbhs".

Rob

RE: [PATCH v4 2/3] dt-bindings: usb: renesas_usbhs: add clock-names property

[Yoshihiro Shimoda]

Hi Rob,

> From: Rob Herring, Sent: Tuesday, September 11, 2018 3:27 AM
> 
> On Mon, Sep 10, 2018 at 06:52:19PM +0900, Yoshihiro Shimoda wrote:
> > R-Car Gen3 needs to enable clocks of both host and peripheral.
> > Otherwise, other side device cannot work correctly. So, this patch
> > adds a property of clock-names for R-Car Gen3 as an optional.
> >
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> > ---
> >  Documentation/devicetree/bindings/usb/renesas_usbhs.txt | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> > index 087140a..dbdb92c 100644
> > --- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> > +++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> > @@ -26,7 +26,9 @@ Required properties:
> >
> >    - reg: Base address and length of the register for the USBHS
> >    - interrupts: Interrupt specifier for the USBHS
> > -  - clocks: A list of phandle + clock specifier pairs
> > +  - clocks: A list of phandle + clock specifier pairs. In case of
> > +	    "renesas,rcar-gen3-usbhs" compatible device, first clock should be
> > +	    peripheral and second one should be host.
> 
> This should have said how many clocks. That's still not clear except for
> "renesas,rcar-gen3-usbhs".

Thank you for your comments! I'll revise it.

Best regards,
Yoshihiro Shimoda

> Rob

[v4,2/3] dt-bindings: usb: renesas_usbhs: add clock-names property

[Yoshihiro Shimoda]

Hi Rob,

> From: Rob Herring, Sent: Tuesday, September 11, 2018 3:27 AM
> 
> On Mon, Sep 10, 2018 at 06:52:19PM +0900, Yoshihiro Shimoda wrote:
> > R-Car Gen3 needs to enable clocks of both host and peripheral.
> > Otherwise, other side device cannot work correctly. So, this patch
> > adds a property of clock-names for R-Car Gen3 as an optional.
> >
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> > ---
> >  Documentation/devicetree/bindings/usb/renesas_usbhs.txt | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> > index 087140a..dbdb92c 100644
> > --- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> > +++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
> > @@ -26,7 +26,9 @@ Required properties:
> >
> >    - reg: Base address and length of the register for the USBHS
> >    - interrupts: Interrupt specifier for the USBHS
> > -  - clocks: A list of phandle + clock specifier pairs
> > +  - clocks: A list of phandle + clock specifier pairs. In case of
> > +	    "renesas,rcar-gen3-usbhs" compatible device, first clock should be
> > +	    peripheral and second one should be host.
> 
> This should have said how many clocks. That's still not clear except for
> "renesas,rcar-gen3-usbhs".

Thank you for your comments! I'll revise it.

Best regards,
Yoshihiro Shimoda

> Rob

[PATCH v4 3/3] usb: renesas_usbhs: Add multiple clocks management

[Yoshihiro Shimoda]

R-Car Gen3 needs to enable clocks of both host and peripheral.
Since [eo]hci-platform disables the reset(s) when the drivers are
removed, renesas_usbhs driver doesn't work correctly. To fix this
issue, this patch adds multiple clocks management on this
renesas_usbhs driver.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/usb/renesas_usbhs/common.c | 88 ++++++++++++++++++++++++++++++++++++++
 drivers/usb/renesas_usbhs/common.h |  2 +
 2 files changed, 90 insertions(+)

diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c
index 1d355d5..d6c39ba 100644
--- a/drivers/usb/renesas_usbhs/common.c
+++ b/drivers/usb/renesas_usbhs/common.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2011 Renesas Solutions Corp.
  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
  */
+#include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
 #include <linux/io.h>
@@ -291,6 +292,79 @@ static void usbhsc_set_buswait(struct usbhs_priv *priv)
 		usbhs_bset(priv, BUSWAIT, 0x000F, wait);
 }
 
+static bool usbhsc_is_multi_clks(struct usbhs_priv *priv)
+{
+	if (priv->dparam.type == USBHS_TYPE_RCAR_GEN3 ||
+	    priv->dparam.type == USBHS_TYPE_RCAR_GEN3_WITH_PLL)
+		return true;
+
+	return false;
+}
+
+static int usbhsc_clk_get(struct device *dev, struct usbhs_priv *priv)
+{
+	if (!usbhsc_is_multi_clks(priv))
+		return 0;
+
+	/* The first clock should exist */
+	priv->clks[0] = of_clk_get(dev->of_node, 0);
+	if (IS_ERR(priv->clks[0]))
+		return PTR_ERR(priv->clks[0]);
+
+	/*
+	 * To backward compatibility with old DT, this driver checks the return
+	 * value if it's -ENOENT or not.
+	 */
+	priv->clks[1] = of_clk_get(dev->of_node, 1);
+	if (PTR_ERR(priv->clks[1]) == -ENOENT)
+		priv->clks[1] = NULL;
+	else if (IS_ERR(priv->clks[1]))
+		return PTR_ERR(priv->clks[1]);
+
+	return 0;
+}
+
+static void usbhsc_clk_put(struct usbhs_priv *priv)
+{
+	int i;
+
+	if (!usbhsc_is_multi_clks(priv))
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(priv->clks); i++)
+		clk_put(priv->clks[i]);
+}
+
+static int usbhsc_clk_prepare_enable(struct usbhs_priv *priv)
+{
+	int i, ret;
+
+	if (!usbhsc_is_multi_clks(priv))
+		return 0;
+
+	for (i = 0; i < ARRAY_SIZE(priv->clks); i++) {
+		ret = clk_prepare_enable(priv->clks[i]);
+		if (ret) {
+			while (--i >= 0)
+				clk_disable_unprepare(priv->clks[i]);
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+static void usbhsc_clk_disable_unprepare(struct usbhs_priv *priv)
+{
+	int i;
+
+	if (!usbhsc_is_multi_clks(priv))
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(priv->clks); i++)
+		clk_disable_unprepare(priv->clks[i]);
+}
+
 /*
  *		platform default param
  */
@@ -341,6 +415,10 @@ static void usbhsc_power_ctrl(struct usbhs_priv *priv, int enable)
 		/* enable PM */
 		pm_runtime_get_sync(dev);
 
+		/* enable clks */
+		if (usbhsc_clk_prepare_enable(priv))
+			return;
+
 		/* enable platform power */
 		usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable);
 
@@ -353,6 +431,9 @@ static void usbhsc_power_ctrl(struct usbhs_priv *priv, int enable)
 		/* disable platform power */
 		usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable);
 
+		/* disable clks */
+		usbhsc_clk_disable_unprepare(priv);
+
 		/* disable PM */
 		pm_runtime_put_sync(dev);
 	}
@@ -667,6 +748,10 @@ static int usbhs_probe(struct platform_device *pdev)
 	if (ret)
 		goto probe_fail_rst;
 
+	ret = usbhsc_clk_get(&pdev->dev, priv);
+	if (ret)
+		goto probe_fail_clks;
+
 	/*
 	 * deviece reset here because
 	 * USB device might be used in boot loader.
@@ -720,6 +805,8 @@ static int usbhs_probe(struct platform_device *pdev)
 	return ret;
 
 probe_end_mod_exit:
+	usbhsc_clk_put(priv);
+probe_fail_clks:
 	reset_control_assert(priv->rsts);
 probe_fail_rst:
 	usbhs_mod_remove(priv);
@@ -750,6 +837,7 @@ static int usbhs_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 
 	usbhs_platform_call(priv, hardware_exit, pdev);
+	usbhsc_clk_put(priv);
 	reset_control_assert(priv->rsts);
 	usbhs_mod_remove(priv);
 	usbhs_fifo_remove(priv);
diff --git a/drivers/usb/renesas_usbhs/common.h b/drivers/usb/renesas_usbhs/common.h
index bce7d35..555b3e7 100644
--- a/drivers/usb/renesas_usbhs/common.h
+++ b/drivers/usb/renesas_usbhs/common.h
@@ -8,6 +8,7 @@
 #ifndef RENESAS_USB_DRIVER_H
 #define RENESAS_USB_DRIVER_H
 
+#include <linux/clk.h>
 #include <linux/extcon.h>
 #include <linux/platform_device.h>
 #include <linux/reset.h>
@@ -279,6 +280,7 @@ struct usbhs_priv {
 
 	struct phy *phy;
 	struct reset_control *rsts;
+	struct clk *clks[2];
 };
 
 /*
-- 
1.9.1

[v4,3/3] usb: renesas_usbhs: Add multiple clocks management

[Yoshihiro Shimoda]

R-Car Gen3 needs to enable clocks of both host and peripheral.
Since [eo]hci-platform disables the reset(s) when the drivers are
removed, renesas_usbhs driver doesn't work correctly. To fix this
issue, this patch adds multiple clocks management on this
renesas_usbhs driver.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/usb/renesas_usbhs/common.c | 88 ++++++++++++++++++++++++++++++++++++++
 drivers/usb/renesas_usbhs/common.h |  2 +
 2 files changed, 90 insertions(+)

diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c
index 1d355d5..d6c39ba 100644
--- a/drivers/usb/renesas_usbhs/common.c
+++ b/drivers/usb/renesas_usbhs/common.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2011 Renesas Solutions Corp.
  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
  */
+#include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
 #include <linux/io.h>
@@ -291,6 +292,79 @@ static void usbhsc_set_buswait(struct usbhs_priv *priv)
 		usbhs_bset(priv, BUSWAIT, 0x000F, wait);
 }
 
+static bool usbhsc_is_multi_clks(struct usbhs_priv *priv)
+{
+	if (priv->dparam.type == USBHS_TYPE_RCAR_GEN3 ||
+	    priv->dparam.type == USBHS_TYPE_RCAR_GEN3_WITH_PLL)
+		return true;
+
+	return false;
+}
+
+static int usbhsc_clk_get(struct device *dev, struct usbhs_priv *priv)
+{
+	if (!usbhsc_is_multi_clks(priv))
+		return 0;
+
+	/* The first clock should exist */
+	priv->clks[0] = of_clk_get(dev->of_node, 0);
+	if (IS_ERR(priv->clks[0]))
+		return PTR_ERR(priv->clks[0]);
+
+	/*
+	 * To backward compatibility with old DT, this driver checks the return
+	 * value if it's -ENOENT or not.
+	 */
+	priv->clks[1] = of_clk_get(dev->of_node, 1);
+	if (PTR_ERR(priv->clks[1]) == -ENOENT)
+		priv->clks[1] = NULL;
+	else if (IS_ERR(priv->clks[1]))
+		return PTR_ERR(priv->clks[1]);
+
+	return 0;
+}
+
+static void usbhsc_clk_put(struct usbhs_priv *priv)
+{
+	int i;
+
+	if (!usbhsc_is_multi_clks(priv))
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(priv->clks); i++)
+		clk_put(priv->clks[i]);
+}
+
+static int usbhsc_clk_prepare_enable(struct usbhs_priv *priv)
+{
+	int i, ret;
+
+	if (!usbhsc_is_multi_clks(priv))
+		return 0;
+
+	for (i = 0; i < ARRAY_SIZE(priv->clks); i++) {
+		ret = clk_prepare_enable(priv->clks[i]);
+		if (ret) {
+			while (--i >= 0)
+				clk_disable_unprepare(priv->clks[i]);
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+static void usbhsc_clk_disable_unprepare(struct usbhs_priv *priv)
+{
+	int i;
+
+	if (!usbhsc_is_multi_clks(priv))
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(priv->clks); i++)
+		clk_disable_unprepare(priv->clks[i]);
+}
+
 /*
  *		platform default param
  */
@@ -341,6 +415,10 @@ static void usbhsc_power_ctrl(struct usbhs_priv *priv, int enable)
 		/* enable PM */
 		pm_runtime_get_sync(dev);
 
+		/* enable clks */
+		if (usbhsc_clk_prepare_enable(priv))
+			return;
+
 		/* enable platform power */
 		usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable);
 
@@ -353,6 +431,9 @@ static void usbhsc_power_ctrl(struct usbhs_priv *priv, int enable)
 		/* disable platform power */
 		usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable);
 
+		/* disable clks */
+		usbhsc_clk_disable_unprepare(priv);
+
 		/* disable PM */
 		pm_runtime_put_sync(dev);
 	}
@@ -667,6 +748,10 @@ static int usbhs_probe(struct platform_device *pdev)
 	if (ret)
 		goto probe_fail_rst;
 
+	ret = usbhsc_clk_get(&pdev->dev, priv);
+	if (ret)
+		goto probe_fail_clks;
+
 	/*
 	 * deviece reset here because
 	 * USB device might be used in boot loader.
@@ -720,6 +805,8 @@ static int usbhs_probe(struct platform_device *pdev)
 	return ret;
 
 probe_end_mod_exit:
+	usbhsc_clk_put(priv);
+probe_fail_clks:
 	reset_control_assert(priv->rsts);
 probe_fail_rst:
 	usbhs_mod_remove(priv);
@@ -750,6 +837,7 @@ static int usbhs_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 
 	usbhs_platform_call(priv, hardware_exit, pdev);
+	usbhsc_clk_put(priv);
 	reset_control_assert(priv->rsts);
 	usbhs_mod_remove(priv);
 	usbhs_fifo_remove(priv);
diff --git a/drivers/usb/renesas_usbhs/common.h b/drivers/usb/renesas_usbhs/common.h
index bce7d35..555b3e7 100644
--- a/drivers/usb/renesas_usbhs/common.h
+++ b/drivers/usb/renesas_usbhs/common.h
@@ -8,6 +8,7 @@
 #ifndef RENESAS_USB_DRIVER_H
 #define RENESAS_USB_DRIVER_H
 
+#include <linux/clk.h>
 #include <linux/extcon.h>
 #include <linux/platform_device.h>
 #include <linux/reset.h>
@@ -279,6 +280,7 @@ struct usbhs_priv {
 
 	struct phy *phy;
 	struct reset_control *rsts;
+	struct clk *clks[2];
 };
 
 /*