[PATCH v2 1/6] ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply always on

[PATCH v2 1/6] ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply always on

[Roger Quadros]

From: Roger Quadros <rogerq@ti.com>

After clarification from the hardware team it was found that
this 1.8V PHY supply can't be switched OFF when SoC is Active.

Since the PHY IPs don't contain isolation logic built in the design to
allow the power rail to be switched off, there is a very high risk
of IP reliability and additional leakage paths which can result in
additional power consumption.

The only scenario where this rail can be switched off is part of Power on
reset sequencing, but it needs to be kept always-on during operation.

This patch is required for proper functionality of USB, SATA
and PCIe on DRA7-evm.

CC: Rajendra Nayak <rnayak@ti.com>
CC: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 arch/arm/boot/dts/dra7-evm.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
index 4adc280..8308954 100644
--- a/arch/arm/boot/dts/dra7-evm.dts
+++ b/arch/arm/boot/dts/dra7-evm.dts
@@ -240,6 +240,7 @@
 					regulator-name = "ldo3";
 					regulator-min-microvolt = <1800000>;
 					regulator-max-microvolt = <1800000>;
+					regulator-always-on;
 					regulator-boot-on;
 				};
 
-- 
1.8.3.2

[PATCH v2 0/6] omap: phy: dra7-evm PHY fixes for 3.16

[Roger Quadros]

Hi,

On DRA7-evm, the VDDA_1V8_PHY supply must be always-on for proper functioning
of the PHYs on the SoC.

The 3.3V USB supply (ldousb_reg) can be turned OFF when the High Speed USB PHYs
are not in use. We add regulator support in the PHY framework core to manage
the PHY's regulator during PHY power on/off.

Finally we add the 3.3V regulator information to the USB2 PHYs.

This series should get the USB and SATA working again on 3.16 on DRA7-evm.

cheers,
-roger

Changelog:

v2:
- removed if (!NULL) check around regulator_put()
- added more technical information in commit message about 1V8_PHY power line
- added pm_runtime_disable in omap_usb2_remove()

---
Roger Quadros (6):
  ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply always on
  phy: core: Fix error path in phy_create()
  phy: core: Support regulator supply for PHY power
  phy: core: Add phy-supply to DT binding documentation
  phy: omap-usb2: Balance pm_runtime_enable() on probe failure and
    remove
  ARM: dts: dra7-evm: Add regulator information to USB2 PHYs

 .../devicetree/bindings/phy/phy-bindings.txt       |  4 +++
 arch/arm/boot/dts/dra7-evm.dts                     |  9 ++++++
 drivers/phy/phy-core.c                             | 33 ++++++++++++++++++++--
 drivers/phy/phy-omap-usb2.c                        |  7 +++--
 include/linux/phy/phy.h                            |  2 ++
 5 files changed, 50 insertions(+), 5 deletions(-)

-- 
1.8.3.2

[PATCH v2 1/6] ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply always on

[Roger Quadros]

After clarification from the hardware team it was found that
this 1.8V PHY supply can't be switched OFF when SoC is Active.

Since the PHY IPs don't contain isolation logic built in the design to
allow the power rail to be switched off, there is a very high risk
of IP reliability and additional leakage paths which can result in
additional power consumption.

The only scenario where this rail can be switched off is part of Power on
reset sequencing, but it needs to be kept always-on during operation.

This patch is required for proper functionality of USB, SATA
and PCIe on DRA7-evm.

CC: Rajendra Nayak <rnayak@ti.com>
CC: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 arch/arm/boot/dts/dra7-evm.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
index 4adc280..8308954 100644
--- a/arch/arm/boot/dts/dra7-evm.dts
+++ b/arch/arm/boot/dts/dra7-evm.dts
@@ -240,6 +240,7 @@
 					regulator-name = "ldo3";
 					regulator-min-microvolt = <1800000>;
 					regulator-max-microvolt = <1800000>;
+					regulator-always-on;
 					regulator-boot-on;
 				};
 
-- 
1.8.3.2

[PATCH v2 2/6] phy: core: Fix error path in phy_create()

[Roger Quadros]

Prevent resources from being freed twice in case device_add() call
fails within phy_create(). Also use ida_simple_remove() instead of
ida_remove() as we had used ida_simple_get() to allocate the ida.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/phy/phy-core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index c64a2f3..49c4465 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -614,8 +614,9 @@ struct phy *phy_create(struct device *dev, const struct phy_ops *ops,
 	return phy;
 
 put_dev:
-	put_device(&phy->dev);
-	ida_remove(&phy_ida, phy->id);
+	put_device(&phy->dev);  /* calls phy_release() which frees resources */
+	return ERR_PTR(ret);
+
 free_phy:
 	kfree(phy);
 	return ERR_PTR(ret);
@@ -799,7 +800,7 @@ static void phy_release(struct device *dev)
 
 	phy = to_phy(dev);
 	dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
-	ida_remove(&phy_ida, phy->id);
+	ida_simple_remove(&phy_ida, phy->id);
 	kfree(phy);
 }
 
-- 
1.8.3.2

[PATCH v2 3/6] phy: core: Support regulator supply for PHY power

[Roger Quadros]

Some PHYs can be powered by an external power regulator.
e.g. USB_HS PHY on DRA7 SoC. Make the PHY core support a
power regulator.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/phy/phy-core.c  | 26 ++++++++++++++++++++++++++
 include/linux/phy/phy.h |  2 ++
 2 files changed, 28 insertions(+)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 49c4465..75c9739 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -21,6 +21,7 @@
 #include <linux/phy/phy.h>
 #include <linux/idr.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 
 static struct class *phy_class;
 static DEFINE_MUTEX(phy_provider_mutex);
@@ -226,6 +227,12 @@ int phy_power_on(struct phy *phy)
 	if (!phy)
 		return 0;
 
+	if (phy->pwr) {
+		ret = regulator_enable(phy->pwr);
+		if (ret)
+			return ret;
+	}
+
 	ret = phy_pm_runtime_get_sync(phy);
 	if (ret < 0 && ret != -ENOTSUPP)
 		return ret;
@@ -247,6 +254,8 @@ int phy_power_on(struct phy *phy)
 out:
 	mutex_unlock(&phy->mutex);
 	phy_pm_runtime_put_sync(phy);
+	if (phy->pwr)
+		regulator_disable(phy->pwr);
 
 	return ret;
 }
@@ -272,6 +281,9 @@ int phy_power_off(struct phy *phy)
 	mutex_unlock(&phy->mutex);
 	phy_pm_runtime_put(phy);
 
+	if (phy->pwr)
+		regulator_disable(phy->pwr);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(phy_power_off);
@@ -588,6 +600,16 @@ struct phy *phy_create(struct device *dev, const struct phy_ops *ops,
 		goto free_phy;
 	}
 
+	/* phy-supply */
+	phy->pwr = regulator_get_optional(dev, "phy");
+	if (IS_ERR(phy->pwr)) {
+		if (PTR_ERR(phy->pwr) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto free_ida;
+		}
+		phy->pwr = NULL;
+	}
+
 	device_initialize(&phy->dev);
 	mutex_init(&phy->mutex);
 
@@ -617,6 +639,9 @@ put_dev:
 	put_device(&phy->dev);  /* calls phy_release() which frees resources */
 	return ERR_PTR(ret);
 
+free_ida:
+	ida_simple_remove(&phy_ida, phy->id);
+
 free_phy:
 	kfree(phy);
 	return ERR_PTR(ret);
@@ -800,6 +825,7 @@ static void phy_release(struct device *dev)
 
 	phy = to_phy(dev);
 	dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
+	regulator_put(phy->pwr);
 	ida_simple_remove(&phy_ida, phy->id);
 	kfree(phy);
 }
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index 2760744..9a86945 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -18,6 +18,7 @@
 #include <linux/of.h>
 #include <linux/device.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 
 struct phy;
 
@@ -65,6 +66,7 @@ struct phy {
 	int			init_count;
 	int			power_count;
 	struct phy_attrs	attrs;
+	struct regulator	*pwr;
 };
 
 /**
-- 
1.8.3.2

[PATCH v2 4/6] phy: core: Add phy-supply to DT binding documentation

[Roger Quadros]

phy-supply is a phandle to the regulator that provides power to the
PHY. This regulator is managed during the PHY power on/off sequence
by the phy core driver.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 Documentation/devicetree/bindings/phy/phy-bindings.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/phy-bindings.txt b/Documentation/devicetree/bindings/phy/phy-bindings.txt
index 8ae844f..2aa1840 100644
--- a/Documentation/devicetree/bindings/phy/phy-bindings.txt
+++ b/Documentation/devicetree/bindings/phy/phy-bindings.txt
@@ -10,6 +10,10 @@ Required Properties:
 		provider can use the values in cells to find the appropriate
 		PHY.
 
+Optional Properties:
+phy-supply:	Phandle to a regulator that provides power to the PHY. This
+		regulator will be managed during the PHY power on/off sequence.
+
 For example:
 
 phys: phy {
-- 
1.8.3.2

[PATCH v2 5/6] phy: omap-usb2: Balance pm_runtime_enable() on probe failure and remove

[Roger Quadros]

If probe fails then we need to call pm_runtime_disable() to balance
out the previous pm_runtime_enable() call. Else it will cause
unbalanced pm_runtime_enable() call in the succeding probe call.

This anomaly was observed when the call to devm_phy_create() failed
with -EPROBE_DEFER.

Balance out the pm_runtime_enable() call in .remove() as well.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/phy/phy-omap-usb2.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c
index 7007c11..3a1d00e 100644
--- a/drivers/phy/phy-omap-usb2.c
+++ b/drivers/phy/phy-omap-usb2.c
@@ -262,7 +262,6 @@ static int omap_usb2_probe(struct platform_device *pdev)
 	otg->phy		= &phy->phy;
 
 	platform_set_drvdata(pdev, phy);
-	pm_runtime_enable(phy->dev);
 
 	generic_phy = devm_phy_create(phy->dev, &ops, NULL);
 	if (IS_ERR(generic_phy))
@@ -270,10 +269,13 @@ static int omap_usb2_probe(struct platform_device *pdev)
 
 	phy_set_drvdata(generic_phy, phy);
 
+	pm_runtime_enable(phy->dev);
 	phy_provider = devm_of_phy_provider_register(phy->dev,
 			of_phy_simple_xlate);
-	if (IS_ERR(phy_provider))
+	if (IS_ERR(phy_provider)) {
+		pm_runtime_disable(phy->dev);
 		return PTR_ERR(phy_provider);
+	}
 
 	phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 	if (IS_ERR(phy->wkupclk)) {
@@ -317,6 +319,7 @@ static int omap_usb2_remove(struct platform_device *pdev)
 	if (!IS_ERR(phy->optclk))
 		clk_unprepare(phy->optclk);
 	usb_remove_phy(&phy->phy);
+	pm_runtime_disable(phy->dev);
 
 	return 0;
 }
-- 
1.8.3.2

[PATCH v2 6/6] ARM: dts: dra7-evm: Add regulator information to USB2 PHYs

[Roger Quadros]

The ldousb_reg regulator provides power to the USB1 and USB2
High Speed PHYs.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 arch/arm/boot/dts/dra7-evm.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
index 8308954..50f8022 100644
--- a/arch/arm/boot/dts/dra7-evm.dts
+++ b/arch/arm/boot/dts/dra7-evm.dts
@@ -496,3 +496,11 @@
 		};
 	};
 };
+
+&usb2_phy1 {
+	phy-supply = <&ldousb_reg>;
+};
+
+&usb2_phy2 {
+	phy-supply = <&ldousb_reg>;
+};
-- 
1.8.3.2

Re: [PATCH v2 1/6] ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply always on

[Tony Lindgren]

* Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> [140704 02:57]:
> After clarification from the hardware team it was found that
> this 1.8V PHY supply can't be switched OFF when SoC is Active.
> 
> Since the PHY IPs don't contain isolation logic built in the design to
> allow the power rail to be switched off, there is a very high risk
> of IP reliability and additional leakage paths which can result in
> additional power consumption.
> 
> The only scenario where this rail can be switched off is part of Power on
> reset sequencing, but it needs to be kept always-on during operation.
> 
> This patch is required for proper functionality of USB, SATA
> and PCIe on DRA7-evm.
> 
> CC: Rajendra Nayak <rnayak-l0cyMroinI0@public.gmane.org>
> CC: Tero Kristo <t-kristo-l0cyMroinI0@public.gmane.org>
> Signed-off-by: Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>

Best that you queue this with the series:

Acked-by: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>

> ---
>  arch/arm/boot/dts/dra7-evm.dts | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
> index 4adc280..8308954 100644
> --- a/arch/arm/boot/dts/dra7-evm.dts
> +++ b/arch/arm/boot/dts/dra7-evm.dts
> @@ -240,6 +240,7 @@
>  					regulator-name = "ldo3";
>  					regulator-min-microvolt = <1800000>;
>  					regulator-max-microvolt = <1800000>;
> +					regulator-always-on;
>  					regulator-boot-on;
>  				};
>  
> -- 
> 1.8.3.2
> 
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Re: [PATCH v2 6/6] ARM: dts: dra7-evm: Add regulator information to USB2 PHYs

[Tony Lindgren]

* Roger Quadros <rogerq@ti.com> [140704 02:58]:
> The ldousb_reg regulator provides power to the USB1 and USB2
> High Speed PHYs.
> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>

This too:

Acked-by: Tony Lindgren <tony@atomide.com>

> ---
>  arch/arm/boot/dts/dra7-evm.dts | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
> index 8308954..50f8022 100644
> --- a/arch/arm/boot/dts/dra7-evm.dts
> +++ b/arch/arm/boot/dts/dra7-evm.dts
> @@ -496,3 +496,11 @@
>  		};
>  	};
>  };
> +
> +&usb2_phy1 {
> +	phy-supply = <&ldousb_reg>;
> +};
> +
> +&usb2_phy2 {
> +	phy-supply = <&ldousb_reg>;
> +};
> -- 
> 1.8.3.2
> 

Re: [PATCH v2 1/6] ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply always on

[Roger Quadros]

Hi Tony,

On 07/07/2014 11:29 AM, Tony Lindgren wrote:
> * Roger Quadros <rogerq@ti.com> [140704 02:57]:
>> After clarification from the hardware team it was found that
>> this 1.8V PHY supply can't be switched OFF when SoC is Active.
>>
>> Since the PHY IPs don't contain isolation logic built in the design to
>> allow the power rail to be switched off, there is a very high risk
>> of IP reliability and additional leakage paths which can result in
>> additional power consumption.
>>
>> The only scenario where this rail can be switched off is part of Power on
>> reset sequencing, but it needs to be kept always-on during operation.
>>
>> This patch is required for proper functionality of USB, SATA
>> and PCIe on DRA7-evm.
>>
>> CC: Rajendra Nayak <rnayak@ti.com>
>> CC: Tero Kristo <t-kristo@ti.com>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
> 
> Best that you queue this with the series:

This patch doesn't have any dependency with the others and we're not even sure if
this series will hit 3.16.

But this 1V8 regulator _is_ required for normal operation of the SoC, whether the
PHYs are in use or not.

Can you please queue just this patch for SoC fixes for 3.16? Thanks.

cheers,
-roger

> 
> Acked-by: Tony Lindgren <tony@atomide.com>
> 
>> ---
>>  arch/arm/boot/dts/dra7-evm.dts | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
>> index 4adc280..8308954 100644
>> --- a/arch/arm/boot/dts/dra7-evm.dts
>> +++ b/arch/arm/boot/dts/dra7-evm.dts
>> @@ -240,6 +240,7 @@
>>  					regulator-name = "ldo3";
>>  					regulator-min-microvolt = <1800000>;
>>  					regulator-max-microvolt = <1800000>;
>> +					regulator-always-on;
>>  					regulator-boot-on;
>>  				};
>>  
>> -- 
>> 1.8.3.2
>>

Re: [PATCH v2 1/6] ARM: dts: dra7-evm: Make VDDA_1V8_PHY supply always on

[Tony Lindgren]

* Roger Quadros <rogerq@ti.com> [140707 01:36]:
> Hi Tony,
> 
> On 07/07/2014 11:29 AM, Tony Lindgren wrote:
> > * Roger Quadros <rogerq@ti.com> [140704 02:57]:
> >> After clarification from the hardware team it was found that
> >> this 1.8V PHY supply can't be switched OFF when SoC is Active.
> >>
> >> Since the PHY IPs don't contain isolation logic built in the design to
> >> allow the power rail to be switched off, there is a very high risk
> >> of IP reliability and additional leakage paths which can result in
> >> additional power consumption.
> >>
> >> The only scenario where this rail can be switched off is part of Power on
> >> reset sequencing, but it needs to be kept always-on during operation.
> >>
> >> This patch is required for proper functionality of USB, SATA
> >> and PCIe on DRA7-evm.
> >>
> >> CC: Rajendra Nayak <rnayak@ti.com>
> >> CC: Tero Kristo <t-kristo@ti.com>
> >> Signed-off-by: Roger Quadros <rogerq@ti.com>
> > 
> > Best that you queue this with the series:
> 
> This patch doesn't have any dependency with the others and we're not even sure if
> this series will hit 3.16.
> 
> But this 1V8 regulator _is_ required for normal operation of the SoC, whether the
> PHYs are in use or not.
> 
> Can you please queue just this patch for SoC fixes for 3.16? Thanks.

OK will do.

Regards,

Tony