[PATCH 0/2] Meson GXL USB3 PHY and OTG detection driver

[PATCH 0/2] Meson GXL USB3 PHY and OTG detection driver

[Martin Blumenstingl]

Amlogic Meson GXL SoCs use a dwc3 controller with two USB2 ports,
Meson GXM SoCs use the same dwc3 controller but with three USB3
ports enabled. Neither of these SoCs has any USB3 port enabled in
the dwc3 registers.
The first USB2 port on both SoCs supports host and peripheral
(also called "device") mode.

The dwc3 controller supports host mode only. Peripheral mode is
implemented through an additional dwc2 controller (which only enables
device mode). The USB3 PHY has register bits which allow a driver to
detect the current mode - however this is currently not implemented
as the dwc2 controller seems to hang during reset (and I do not have
a use-case where I need peripheral/device mode).

While the dwc3 controller has no USB3 port enabled we still need the
USB3 PHY to be initialized, otherwise some boards (probably those where
the bootloader does not initialize the USB3 PHY) show errors with
high-speed USB devices connected to any of the USB2 ports. Configuring
the USB_R1_U3H_FLADJ_30MHZ_REG_MASK register as it's done by Amlogic's
vendor GPL kernel sources makes these error go away.

Thanks to Jerome Brunet for reporting the errors and Neil Armstrong
for discovering that initializing the USB3 PHY fixes these USB errors!


Martin Blumenstingl (2):
  dt-bindings: phy: Add support for the USB3 PHY on Amlogic Meson GXL
    SoCs
  phy: amlogic: add USB3 PHY support for Meson GXL and GXM

 .../devicetree/bindings/phy/meson-gxl-usb3-phy.txt |  19 +++
 drivers/phy/amlogic/Kconfig                        |  12 ++
 drivers/phy/amlogic/Makefile                       |   1 +
 drivers/phy/amlogic/phy-meson-gxl-usb3.c           | 177 +++++++++++++++++++++
 4 files changed, 209 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/meson-gxl-usb3-phy.txt
 create mode 100644 drivers/phy/amlogic/phy-meson-gxl-usb3.c

-- 
2.14.1

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[PATCH 1/2] dt-bindings: phy: Add support for the USB3 PHY on Amlogic Meson GXL SoCs

[Martin Blumenstingl]

Amlogic Meson GXL SoCs use a dwc3 controller with two (GXM - a variant
for GXL, has three) USB2 ports. The first USB2 port supports host and
peripheral (also called "device") mode.
While the dwc3 controller has no USB3 port enabled we still need the
USB3 PHY to be initialized, otherwise some boards (probably those where
the bootloader does not initialize the USB3 PHY) show errors with
high-speed USB devices connected to any of the USB2 ports.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
---
 .../devicetree/bindings/phy/meson-gxl-usb3-phy.txt    | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/meson-gxl-usb3-phy.txt

diff --git a/Documentation/devicetree/bindings/phy/meson-gxl-usb3-phy.txt b/Documentation/devicetree/bindings/phy/meson-gxl-usb3-phy.txt
new file mode 100644
index 000000000000..2b7c3715d52d
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/meson-gxl-usb3-phy.txt
@@ -0,0 +1,19 @@
+* Amlogic Meson GXL and GXM USB3 PHY and OTG detection binding
+
+Required properties:
+- compatible:	Should be "amlogic,meson-gxl-usb3-phy"
+- reg:		The base address and length of the registers
+- #phys-cells:	must be 0 (see phy-bindings.txt in this directory)
+
+Optional properties:
+- interrupts:	the interrupt specifier for the OTG detection
+- phy-supply:	see phy-bindings.txt in this directory
+
+
+Example:
+	usb3_phy0: phy@78080 {
+		compatible = "amlogic,meson-gxl-usb3-phy";
+		#phy-cells = <0>;
+		reg = <0x0 0x78080 0x0 0x20>;
+		interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
+	};
-- 
2.14.1

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Re: [PATCH 1/2] dt-bindings: phy: Add support for the USB3 PHY on Amlogic Meson GXL SoCs

[Rob Herring]

On Sun, Sep 24, 2017 at 09:49:59PM +0200, Martin Blumenstingl wrote:
> Amlogic Meson GXL SoCs use a dwc3 controller with two (GXM - a variant
> for GXL, has three) USB2 ports. The first USB2 port supports host and
> peripheral (also called "device") mode.
> While the dwc3 controller has no USB3 port enabled we still need the
> USB3 PHY to be initialized, otherwise some boards (probably those where
> the bootloader does not initialize the USB3 PHY) show errors with
> high-speed USB devices connected to any of the USB2 ports.
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
> ---
>  .../devicetree/bindings/phy/meson-gxl-usb3-phy.txt    | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/meson-gxl-usb3-phy.txt

Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
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[PATCH 2/2] phy: amlogic: add USB3 PHY support for Meson GXL and GXM

[Martin Blumenstingl]

This adds a new driver for the USB3 PHY found on Meson GXL and GXM SoCs
(both SoCs are using the same USB PHY register layout).

Unfortunately there is no documentation for this PHY in the public S905X
datasheet (published for example by Khadas). What we know so far about
this PHY:
- even though the Meson GXL and GXM SoCs do not expose an USB3 port (the
  dwc3 controller only has USB2 ports enabled) we need to initialize the
  USB3 PHY (specifically USB_R1_U3H_FLADJ_30MHZ_REG_MASK). Without this
  initialization high-speed USB devices (especially USB hard disks and
  thumb drives, slower devices like mice do not seem to be affected)
- it is responsible for the OTG detection and for switching the first
  USB2 PHY between host and peripheral (aka device) mode. an interrupt
  can be used to detect changes between host and device mode.

The whole OTG detection logic is currently not implemented.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
---
 drivers/phy/amlogic/Kconfig              |  12 +++
 drivers/phy/amlogic/Makefile             |   1 +
 drivers/phy/amlogic/phy-meson-gxl-usb3.c | 177 +++++++++++++++++++++++++++++++
 3 files changed, 190 insertions(+)
 create mode 100644 drivers/phy/amlogic/phy-meson-gxl-usb3.c

diff --git a/drivers/phy/amlogic/Kconfig b/drivers/phy/amlogic/Kconfig
index cb8f4501652b..2f690d24203a 100644
--- a/drivers/phy/amlogic/Kconfig
+++ b/drivers/phy/amlogic/Kconfig
@@ -25,3 +25,15 @@ config PHY_MESON_GXL_USB2
 	  Enable this to support the Meson USB2 PHYs found in Meson
 	  GXL and GXM SoCs.
 	  If unsure, say N.
+
+config PHY_MESON_GXL_USB3
+	tristate "Meson GXL and GXM USB3 PHY drivers"
+	default ARCH_MESON
+	depends on OF && (ARCH_MESON || COMPILE_TEST)
+	depends on USB_SUPPORT
+	select GENERIC_PHY
+	select REGMAP_MMIO
+	help
+	  Enable this to support the Meson USB3 PHY and OTG detection
+	  IP block found in Meson GXL and GXM SoCs.
+	  If unsure, say N.
diff --git a/drivers/phy/amlogic/Makefile b/drivers/phy/amlogic/Makefile
index cfdc98715c30..4fd8848c194d 100644
--- a/drivers/phy/amlogic/Makefile
+++ b/drivers/phy/amlogic/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_PHY_MESON8B_USB2)		+= phy-meson8b-usb2.o
 obj-$(CONFIG_PHY_MESON_GXL_USB2)	+= phy-meson-gxl-usb2.o
+obj-$(CONFIG_PHY_MESON_GXL_USB3)	+= phy-meson-gxl-usb3.o
diff --git a/drivers/phy/amlogic/phy-meson-gxl-usb3.c b/drivers/phy/amlogic/phy-meson-gxl-usb3.c
new file mode 100644
index 000000000000..8cbe2a4ab7e7
--- /dev/null
+++ b/drivers/phy/amlogic/phy-meson-gxl-usb3.c
@@ -0,0 +1,177 @@
+/*
+ * Meson GXL USB3 PHY and OTG mode detection driver
+ *
+ * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+#define USB_R0							0x00
+	#define USB_R0_P30_FSEL_MASK				GENMASK(5, 0)
+	#define USB_R0_P30_PHY_RESET				BIT(6)
+	#define USB_R0_P30_TEST_POWERDOWN_HSP			BIT(7)
+	#define USB_R0_P30_TEST_POWERDOWN_SSP			BIT(8)
+	#define USB_R0_P30_ACJT_LEVEL_MASK			GENMASK(13, 9)
+	#define USB_R0_P30_TX_BOOST_LEVEL_MASK			GENMASK(16, 14)
+	#define USB_R0_P30_LANE0_TX2RX_LOOPBACK			BIT(17)
+	#define USB_R0_P30_LANE0_EXT_PCLK_REQ			BIT(18)
+	#define USB_R0_P30_PCS_RX_LOS_MASK_VAL_MASK		GENMASK(28, 19)
+	#define USB_R0_U2D_SS_SCALEDOWN_MODE_MASK		GENMASK(30, 29)
+	#define USB_R0_U2D_ACT					BIT(31)
+
+#define USB_R1							0x04
+	#define USB_R1_U3H_BIGENDIAN_GS				BIT(0)
+	#define USB_R1_U3H_PME_ENABLE				BIT(1)
+	#define USB_R1_U3H_HUB_PORT_OVERCURRENT_MASK		GENMASK(6, 2)
+	#define USB_R1_U3H_HUB_PORT_PERM_ATTACH_MASK		GENMASK(11, 7)
+	#define USB_R1_U3H_HOST_U2_PORT_DISABLE_MASK		GENMASK(15, 12)
+	#define USB_R1_U3H_HOST_U3_PORT_DISABLE			BIT(16)
+	#define USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT	BIT(17)
+	#define USB_R1_U3H_HOST_MSI_ENABLE			BIT(18)
+	#define USB_R1_U3H_FLADJ_30MHZ_REG_MASK			GENMASK(24, 19)
+	#define USB_R1_P30_PCS_TX_SWING_FULL_MASK		GENMASK(31, 25)
+
+#define USB_R2							0x08
+	#define USB_R2_P30_CR_DATA_IN_MASK			GENMASK(15, 0)
+	#define USB_R2_P30_CR_READ				BIT(16)
+	#define USB_R2_P30_CR_WRITE				BIT(17)
+	#define USB_R2_P30_CR_CAP_ADDR				BIT(18)
+	#define USB_R2_P30_CR_CAP_DATA				BIT(19)
+	#define USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK		GENMASK(25, 20)
+	#define USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK		GENMASK(31, 26)
+
+#define USB_R3							0x0c
+	#define USB_R3_P30_SSC_ENABLE				BIT(0)
+	#define USB_R3_P30_SSC_RANGE_MASK			GENMASK(3, 1)
+	#define USB_R3_P30_SSC_REF_CLK_SEL_MASK			GENMASK(12, 4)
+	#define USB_R3_P30_REF_SSP_EN				BIT(13)
+	#define USB_R3_P30_LOS_BIAS_MASK			GENMASK(18, 16)
+	#define USB_R3_P30_LOS_LEVEL_MASK			GENMASK(23, 19)
+	#define USB_R3_P30_MPLL_MULTIPLIER_MASK			GENMASK(30, 24)
+
+#define USB_R4							0x10
+	#define USB_R4_P21_PORT_RESET_0				BIT(0)
+	#define USB_R4_P21_SLEEP_M0				BIT(1)
+	#define USB_R4_MEM_PD_MASK				GENMASK(3, 2)
+	#define USB_R4_P21_ONLY					BIT(4)
+
+#define USB_R5							0x14
+	#define USB_R5_ID_DIG_SYNC				BIT(0)
+	#define USB_R5_ID_DIG_REG				BIT(1)
+	#define USB_R5_ID_DIG_CFG_MASK				GENMASK(3, 2)
+	#define USB_R5_ID_DIG_EN_0				BIT(4)
+	#define USB_R5_ID_DIG_EN_1				BIT(5)
+	#define USB_R5_ID_DIG_CURR				BIT(6)
+	#define USB_R5_ID_DIG_IRQ				BIT(7)
+	#define USB_R5_ID_DIG_TH_MASK				GENMASK(15, 8)
+	#define USB_R5_ID_DIG_CNT_MASK				GENMASK(23, 16)
+
+/* read-only register */
+#define USB_R6							0x18
+	#define USB_R6_P30_CR_DATA_OUT_MASK			GENMASK(15, 0)
+	#define USB_R6_P30_CR_ACK				BIT(16)
+
+#define RESET_COMPLETE_TIME				500
+
+struct phy_meson_gxl_usb3_priv {
+	struct regmap		*regmap;
+};
+
+static const struct regmap_config phy_meson_gxl_usb3_regmap_conf = {
+	.reg_bits = 8,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = USB_R6,
+};
+
+static int phy_meson_gxl_usb3_power_on(struct phy *phy)
+{
+	struct phy_meson_gxl_usb3_priv *priv = phy_get_drvdata(phy);
+
+	regmap_update_bits(priv->regmap, USB_R1,
+			   USB_R1_U3H_FLADJ_30MHZ_REG_MASK,
+			   FIELD_PREP(USB_R1_U3H_FLADJ_30MHZ_REG_MASK, 0x20));
+
+	regmap_update_bits(priv->regmap, USB_R5, USB_R5_ID_DIG_EN_0,
+			   USB_R5_ID_DIG_EN_0);
+	regmap_update_bits(priv->regmap, USB_R5, USB_R5_ID_DIG_EN_1,
+			   USB_R5_ID_DIG_EN_1);
+	regmap_update_bits(priv->regmap, USB_R5, USB_R5_ID_DIG_TH_MASK,
+			   FIELD_PREP(USB_R5_ID_DIG_TH_MASK, 0xff));
+
+	return 0;
+}
+
+static const struct phy_ops phy_meson_gxl_usb3_ops = {
+	.power_on	= phy_meson_gxl_usb3_power_on,
+	.owner		= THIS_MODULE,
+};
+
+static int phy_meson_gxl_usb3_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct phy_meson_gxl_usb3_priv *priv;
+	struct resource *res;
+	struct phy *phy;
+	struct phy_provider *phy_provider;
+	void __iomem *base;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	priv->regmap = devm_regmap_init_mmio(dev, base,
+					     &phy_meson_gxl_usb3_regmap_conf);
+	if (IS_ERR(priv->regmap))
+		return PTR_ERR(priv->regmap);
+
+	phy = devm_phy_create(dev, np, &phy_meson_gxl_usb3_ops);
+	if (IS_ERR(phy)) {
+		dev_err(dev, "failed to create PHY\n");
+		return PTR_ERR(phy);
+	}
+
+	phy_set_drvdata(phy, priv);
+
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+	return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id phy_meson_gxl_usb3_of_match[] = {
+	{ .compatible = "amlogic,meson-gxl-usb3-phy", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, phy_meson_gxl_usb3_of_match);
+
+static struct platform_driver phy_meson_gxl_usb3_driver = {
+	.probe	= phy_meson_gxl_usb3_probe,
+	.driver	= {
+		.name		= "phy-meson-gxl-usb3",
+		.of_match_table	= phy_meson_gxl_usb3_of_match,
+	},
+};
+module_platform_driver(phy_meson_gxl_usb3_driver);
+
+MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>");
+MODULE_DESCRIPTION("Meson GXL USB3 PHY and OTG detection driver");
+MODULE_LICENSE("GPL v2");
-- 
2.14.1

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Re: [PATCH 2/2] phy: amlogic: add USB3 PHY support for Meson GXL and GXM

[Kishon Vijay Abraham I]

Hi,

On Monday 25 September 2017 01:20 AM, Martin Blumenstingl wrote:
> This adds a new driver for the USB3 PHY found on Meson GXL and GXM SoCs
> (both SoCs are using the same USB PHY register layout).
> 
> Unfortunately there is no documentation for this PHY in the public S905X
> datasheet (published for example by Khadas). What we know so far about
> this PHY:
> - even though the Meson GXL and GXM SoCs do not expose an USB3 port (the
>   dwc3 controller only has USB2 ports enabled) we need to initialize the
>   USB3 PHY (specifically USB_R1_U3H_FLADJ_30MHZ_REG_MASK). Without this
>   initialization high-speed USB devices (especially USB hard disks and
>   thumb drives, slower devices like mice do not seem to be affected)
> - it is responsible for the OTG detection and for switching the first
>   USB2 PHY between host and peripheral (aka device) mode. an interrupt
>   can be used to detect changes between host and device mode.
> 
> The whole OTG detection logic is currently not implemented.

Is this an independent instance of the phy? The programming model looks similar
to phy-meson-gxl-usb2.c..

I'm just thinking if we should have only a phy-meson-gxl-usb.c and have both
usb2 and usb3 phy programming there?

Thanks
Kishon
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Re: [PATCH 2/2] phy: amlogic: add USB3 PHY support for Meson GXL and GXM

[Martin Blumenstingl]

Hi Kishon,

thank you for reviewing this!

On Tue, Nov 7, 2017 at 6:53 AM, Kishon Vijay Abraham I <kishon-l0cyMroinI0@public.gmane.org> wrote:
> Hi,
>
> On Monday 25 September 2017 01:20 AM, Martin Blumenstingl wrote:
>> This adds a new driver for the USB3 PHY found on Meson GXL and GXM SoCs
>> (both SoCs are using the same USB PHY register layout).
>>
>> Unfortunately there is no documentation for this PHY in the public S905X
>> datasheet (published for example by Khadas). What we know so far about
>> this PHY:
>> - even though the Meson GXL and GXM SoCs do not expose an USB3 port (the
>>   dwc3 controller only has USB2 ports enabled) we need to initialize the
>>   USB3 PHY (specifically USB_R1_U3H_FLADJ_30MHZ_REG_MASK). Without this
>>   initialization high-speed USB devices (especially USB hard disks and
>>   thumb drives, slower devices like mice do not seem to be affected)
>> - it is responsible for the OTG detection and for switching the first
>>   USB2 PHY between host and peripheral (aka device) mode. an interrupt
>>   can be used to detect changes between host and device mode.
>>
>> The whole OTG detection logic is currently not implemented.
>
> Is this an independent instance of the phy? The programming model looks similar
> to phy-meson-gxl-usb2.c..
there are up to four USB2 PHYs in these SoCs but only one USB3 PHY.
from what I can tell both PHY types are different (both use a totally
different register layout)

> I'm just thinking if we should have only a phy-meson-gxl-usb.c and have both
> usb2 and usb3 phy programming there?
I can try that, but I think it would make the result harder to read
(as the only parts that can be re-used are in the priv memory
allocation, creating the regmap and the PHY registration in the _probe
function)
so I would prefer to keep both PHYs as separate drivers in separate files


Regards
Martin
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Re: [PATCH 0/2] Meson GXL USB3 PHY and OTG detection driver

[Jerome Brunet]

On Sun, 2017-09-24 at 21:49 +0200, Martin Blumenstingl wrote:
> Amlogic Meson GXL SoCs use a dwc3 controller with two USB2 ports,
> Meson GXM SoCs use the same dwc3 controller but with three USB3
> ports enabled. Neither of these SoCs has any USB3 port enabled in
> the dwc3 registers.
> The first USB2 port on both SoCs supports host and peripheral
> (also called "device") mode.
> 
> The dwc3 controller supports host mode only. Peripheral mode is
> implemented through an additional dwc2 controller (which only enables
> device mode). The USB3 PHY has register bits which allow a driver to
> detect the current mode - however this is currently not implemented
> as the dwc2 controller seems to hang during reset (and I do not have
> a use-case where I need peripheral/device mode).
> 
> While the dwc3 controller has no USB3 port enabled we still need the
> USB3 PHY to be initialized, otherwise some boards (probably those where
> the bootloader does not initialize the USB3 PHY) show errors with
> high-speed USB devices connected to any of the USB2 ports. Configuring
> the USB_R1_U3H_FLADJ_30MHZ_REG_MASK register as it's done by Amlogic's
> vendor GPL kernel sources makes these error go away.
> 
> Thanks to Jerome Brunet for reporting the errors and Neil Armstrong
> for discovering that initializing the USB3 PHY fixes these USB errors!
> 

This series works well on the libretech-cc (le potato)
For the series:

Tested-by: Jerome Brunet <jbrunet-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>

> 
> Martin Blumenstingl (2):
>   dt-bindings: phy: Add support for the USB3 PHY on Amlogic Meson GXL
>     SoCs
>   phy: amlogic: add USB3 PHY support for Meson GXL and GXM
> 
>  .../devicetree/bindings/phy/meson-gxl-usb3-phy.txt |  19 +++
>  drivers/phy/amlogic/Kconfig                        |  12 ++
>  drivers/phy/amlogic/Makefile                       |   1 +
>  drivers/phy/amlogic/phy-meson-gxl-usb3.c           | 177
> +++++++++++++++++++++
>  4 files changed, 209 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/meson-gxl-usb3-
> phy.txt
>  create mode 100644 drivers/phy/amlogic/phy-meson-gxl-usb3.c
> 

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Re: [PATCH 0/2] Meson GXL USB3 PHY and OTG detection driver

[Neil Armstrong]

On 24/09/2017 21:49, Martin Blumenstingl wrote:
> Amlogic Meson GXL SoCs use a dwc3 controller with two USB2 ports,
> Meson GXM SoCs use the same dwc3 controller but with three USB3
> ports enabled. Neither of these SoCs has any USB3 port enabled in
> the dwc3 registers.
> The first USB2 port on both SoCs supports host and peripheral
> (also called "device") mode.
> 
> The dwc3 controller supports host mode only. Peripheral mode is
> implemented through an additional dwc2 controller (which only enables
> device mode). The USB3 PHY has register bits which allow a driver to
> detect the current mode - however this is currently not implemented
> as the dwc2 controller seems to hang during reset (and I do not have
> a use-case where I need peripheral/device mode).
> 
> While the dwc3 controller has no USB3 port enabled we still need the
> USB3 PHY to be initialized, otherwise some boards (probably those where
> the bootloader does not initialize the USB3 PHY) show errors with
> high-speed USB devices connected to any of the USB2 ports. Configuring
> the USB_R1_U3H_FLADJ_30MHZ_REG_MASK register as it's done by Amlogic's
> vendor GPL kernel sources makes these error go away.
> 
> Thanks to Jerome Brunet for reporting the errors and Neil Armstrong
> for discovering that initializing the USB3 PHY fixes these USB errors!
> 
> 
> Martin Blumenstingl (2):
>   dt-bindings: phy: Add support for the USB3 PHY on Amlogic Meson GXL
>     SoCs
>   phy: amlogic: add USB3 PHY support for Meson GXL and GXM
> 
>  .../devicetree/bindings/phy/meson-gxl-usb3-phy.txt |  19 +++
>  drivers/phy/amlogic/Kconfig                        |  12 ++
>  drivers/phy/amlogic/Makefile                       |   1 +
>  drivers/phy/amlogic/phy-meson-gxl-usb3.c           | 177 +++++++++++++++++++++
>  4 files changed, 209 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/meson-gxl-usb3-phy.txt
>  create mode 100644 drivers/phy/amlogic/phy-meson-gxl-usb3.c
> 

Tested-by: Neil Armstrong <narmstrong-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
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Re: [PATCH 0/2] Meson GXL USB3 PHY and OTG detection driver

[Martin Blumenstingl]

Hi Kishon,

On Sun, Sep 24, 2017 at 9:49 PM, Martin Blumenstingl
<martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
> Amlogic Meson GXL SoCs use a dwc3 controller with two USB2 ports,
> Meson GXM SoCs use the same dwc3 controller but with three USB3
> ports enabled. Neither of these SoCs has any USB3 port enabled in
> the dwc3 registers.
> The first USB2 port on both SoCs supports host and peripheral
> (also called "device") mode.
>
> The dwc3 controller supports host mode only. Peripheral mode is
> implemented through an additional dwc2 controller (which only enables
> device mode). The USB3 PHY has register bits which allow a driver to
> detect the current mode - however this is currently not implemented
> as the dwc2 controller seems to hang during reset (and I do not have
> a use-case where I need peripheral/device mode).
>
> While the dwc3 controller has no USB3 port enabled we still need the
> USB3 PHY to be initialized, otherwise some boards (probably those where
> the bootloader does not initialize the USB3 PHY) show errors with
> high-speed USB devices connected to any of the USB2 ports. Configuring
> the USB_R1_U3H_FLADJ_30MHZ_REG_MASK register as it's done by Amlogic's
> vendor GPL kernel sources makes these error go away.
>
> Thanks to Jerome Brunet for reporting the errors and Neil Armstrong
> for discovering that initializing the USB3 PHY fixes these USB errors!
>
>
> Martin Blumenstingl (2):
>   dt-bindings: phy: Add support for the USB3 PHY on Amlogic Meson GXL
>     SoCs
I need to update the dt-bindings patch as there is an interrupt which
seems to exist on all hardware revisions (but this interrupt is not
described in the binding yet)
so please do NOT take this series until I re-spin it so I can add the
mandatory interrupt (if we add it later we can only add it optionally)

>   phy: amlogic: add USB3 PHY support for Meson GXL and GXM
could you please give your feedback on this one?

>
>  .../devicetree/bindings/phy/meson-gxl-usb3-phy.txt |  19 +++
>  drivers/phy/amlogic/Kconfig                        |  12 ++
>  drivers/phy/amlogic/Makefile                       |   1 +
>  drivers/phy/amlogic/phy-meson-gxl-usb3.c           | 177 +++++++++++++++++++++
>  4 files changed, 209 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/meson-gxl-usb3-phy.txt
>  create mode 100644 drivers/phy/amlogic/phy-meson-gxl-usb3.c
>
> --
> 2.14.1
>


Regards,
Martin
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