[PATCH v3 0/3] phy: omap-usb2: add quirk to disable charger detection

[PATCH v3 0/3] phy: omap-usb2: add quirk to disable charger detection

[Roger Quadros]

Hi,

- convert DT binding to YAML
- add DT property to disable charger detection
  (Errata i2075 for AM65 SR1.0)

Changelog:
v3
- Removed quotes from compatibles
- changed property to "ti,disable-charger-det"

v2
- Address Rob's comments on YAML schema.

cheers,
-roger

Roger Quadros (3):
  dt-binding: phy: convert ti,omap-usb2 to YAML
  dt-binding: phy: ti,omap-usb2: Add quirk to disable charger detection
  phy: omap-usb2-phy: disable PHY charger detect

 .../devicetree/bindings/phy/ti,omap-usb2.yaml | 74 +++++++++++++++++++
 .../devicetree/bindings/phy/ti-phy.txt        | 37 ----------
 drivers/phy/ti/phy-omap-usb2.c                | 35 +++++++--
 3 files changed, 102 insertions(+), 44 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml

-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

[PATCH v3 1/3] dt-binding: phy: convert ti,omap-usb2 to YAML

[Roger Quadros]

Move ti,omap-usb2 to its own YAML schema.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../devicetree/bindings/phy/ti,omap-usb2.yaml | 69 +++++++++++++++++++
 .../devicetree/bindings/phy/ti-phy.txt        | 37 ----------
 2 files changed, 69 insertions(+), 37 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml

diff --git a/Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml b/Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml
new file mode 100644
index 000000000000..8df74629dc55
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml
@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/ti,omap-usb2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: OMAP USB2 PHY
+
+maintainers:
+ - Kishon Vijay Abraham I <kishon@ti.com>
+ - Roger Quadros <rogerq@ti.com>
+
+properties:
+  compatible:
+    items:
+      - enum:
+        - ti,dra7x-usb2
+        - ti,dra7x-usb2-phy2a
+        - ti,am654-usb2
+      - enum:
+        - ti,omap-usb2
+
+  reg:
+    maxItems: 1
+
+  '#phy-cells':
+    const: 0
+
+  clocks:
+    minItems: 1
+    items:
+      - description: wakeup clock
+      - description: reference clock
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: wkupclk
+      - const: refclk
+
+  syscon-phy-power:
+    $ref: /schemas/types.yaml#definitions/phandle-array
+    description:
+      phandle/offset pair. Phandle to the system control module and
+      register offset to power on/off the PHY.
+
+  ctrl-module:
+    $ref: /schemas/types.yaml#definitions/phandle
+    description:
+      (deprecated) phandle of the control module used by PHY driver
+      to power on the PHY. Use syscon-phy-power instead.
+
+required:
+  - compatible
+  - reg
+  - '#phy-cells'
+  - clocks
+  - clock-names
+
+examples:
+  - |
+    usb0_phy: phy@4100000 {
+      compatible = "ti,am654-usb2", "ti,omap-usb2";
+      reg = <0x0 0x4100000 0x0 0x54>;
+      syscon-phy-power = <&scm_conf 0x4000>;
+      clocks = <&k3_clks 151 0>, <&k3_clks 151 1>;
+      clock-names = "wkupclk", "refclk";
+      #phy-cells = <0>;
+    };
diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt b/Documentation/devicetree/bindings/phy/ti-phy.txt
index 8f93c3b694a7..60c9d0ac75e6 100644
--- a/Documentation/devicetree/bindings/phy/ti-phy.txt
+++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
@@ -27,43 +27,6 @@ omap_control_usb: omap-control-usb@4a002300 {
         reg-names = "otghs_control";
 };
 
-OMAP USB2 PHY
-
-Required properties:
- - compatible: Should be "ti,omap-usb2"
-	       Should be "ti,dra7x-usb2" for the 1st instance of USB2 PHY on
-	       DRA7x
-	       Should be "ti,dra7x-usb2-phy2" for the 2nd instance of USB2 PHY
-	       in DRA7x
-	       Should be "ti,am654-usb2" for the USB2 PHYs on AM654.
- - reg : Address and length of the register set for the device.
- - #phy-cells: determine the number of cells that should be given in the
-   phandle while referencing this phy.
- - clocks: a list of phandles and clock-specifier pairs, one for each entry in
-   clock-names.
- - clock-names: should include:
-   * "wkupclk" - wakeup clock.
-   * "refclk" - reference clock (optional).
-
-Deprecated properties:
- - ctrl-module : phandle of the control module used by PHY driver to power on
-   the PHY.
-
-Recommended properies:
-- syscon-phy-power : phandle/offset pair. Phandle to the system control
-  module and the register offset to power on/off the PHY.
-
-This is usually a subnode of ocp2scp to which it is connected.
-
-usb2phy@4a0ad080 {
-	compatible = "ti,omap-usb2";
-	reg = <0x4a0ad080 0x58>;
-	ctrl-module = <&omap_control_usb>;
-	#phy-cells = <0>;
-	clocks = <&usb_phy_cm_clk32k>, <&usb_otg_ss_refclk960m>;
-	clock-names = "wkupclk", "refclk";
-};
-
 TI PIPE3 PHY
 
 Required properties:
-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

Re: [PATCH v3 1/3] dt-binding: phy: convert ti,omap-usb2 to YAML

[Rob Herring]

On Tue, 30 Jun 2020 12:27:27 +0300, Roger Quadros wrote:
> Move ti,omap-usb2 to its own YAML schema.
> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
>  .../devicetree/bindings/phy/ti,omap-usb2.yaml | 69 +++++++++++++++++++
>  .../devicetree/bindings/phy/ti-phy.txt        | 37 ----------
>  2 files changed, 69 insertions(+), 37 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml
> 


My bot found errors running 'make dt_binding_check' on your patch:

/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/phy/ti,omap-usb2.example.dt.yaml: example-0: phy@4100000:reg:0: [0, 68157440, 0, 84] is too long


See https://patchwork.ozlabs.org/patch/1319665

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure dt-schema is up to date:

pip3 install git+https://github.com/devicetree-org/dt-schema.git@master --upgrade

Please check and re-submit.

Re: [PATCH v3 1/3] dt-binding: phy: convert ti,omap-usb2 to YAML

[Roger Quadros]

Hi Rob,

On 02/07/2020 23:47, Rob Herring wrote:
> On Tue, 30 Jun 2020 12:27:27 +0300, Roger Quadros wrote:
>> Move ti,omap-usb2 to its own YAML schema.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> Reviewed-by: Rob Herring <robh@kernel.org>
>> ---
>>   .../devicetree/bindings/phy/ti,omap-usb2.yaml | 69 +++++++++++++++++++
>>   .../devicetree/bindings/phy/ti-phy.txt        | 37 ----------
>>   2 files changed, 69 insertions(+), 37 deletions(-)
>>   create mode 100644 Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml
>>
> 
> 
> My bot found errors running 'make dt_binding_check' on your patch:
> 
> /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/phy/ti,omap-usb2.example.dt.yaml: example-0: phy@4100000:reg:0: [0, 68157440, 0, 84] is too long
> 

In my local build in the dt example I see

     phy@4100000:
       compatible: ["ti,am654-usb2", "ti,omap-usb2"]
       reg: [[0x0, 0x4100000, 0x0, 0x54]]

And I don't see any errors. I've updated my dt-schema as well.

> 
> See https://patchwork.ozlabs.org/patch/1319665
> 
> If you already ran 'make dt_binding_check' and didn't see the above
> error(s), then make sure dt-schema is up to date:
> 
> pip3 install git+https://github.com/devicetree-org/dt-schema.git@master --upgrade
> 
> Please check and re-submit.
> 

-- 
cheers,
-roger

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

Re: [PATCH v3 1/3] dt-binding: phy: convert ti,omap-usb2 to YAML

[Roger Quadros]

On 03/07/2020 11:58, Roger Quadros wrote:
> Hi Rob,
> 
> On 02/07/2020 23:47, Rob Herring wrote:
>> On Tue, 30 Jun 2020 12:27:27 +0300, Roger Quadros wrote:
>>> Move ti,omap-usb2 to its own YAML schema.
>>>
>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>> Reviewed-by: Rob Herring <robh@kernel.org>
>>> ---
>>>   .../devicetree/bindings/phy/ti,omap-usb2.yaml | 69 +++++++++++++++++++
>>>   .../devicetree/bindings/phy/ti-phy.txt        | 37 ----------
>>>   2 files changed, 69 insertions(+), 37 deletions(-)
>>>   create mode 100644 Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml
>>>
>>
>>
>> My bot found errors running 'make dt_binding_check' on your patch:
>>
>> /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/phy/ti,omap-usb2.example.dt.yaml: example-0: phy@4100000:reg:0: [0, 68157440, 0, 84] is too long
>>
> 
> In my local build in the dt example I see
> 
>      phy@4100000:
>        compatible: ["ti,am654-usb2", "ti,omap-usb2"]
>        reg: [[0x0, 0x4100000, 0x0, 0x54]]
> 
> And I don't see any errors. I've updated my dt-schema as well.

I'm able to see the issue now. Will fix it and send v4.

> 
>>
>> See https://patchwork.ozlabs.org/patch/1319665
>>
>> If you already ran 'make dt_binding_check' and didn't see the above
>> error(s), then make sure dt-schema is up to date:
>>
>> pip3 install git+https://github.com/devicetree-org/dt-schema.git@master --upgrade
>>
>> Please check and re-submit.
>>
> 

cheers,
-roger
-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

[PATCH v3 2/3] dt-binding: phy: ti,omap-usb2: Add quirk to disable charger detection

[Roger Quadros]

Add "ti,disable-charger-det" property to disable the USB2_PHY Charger Detect
logic.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml b/Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml
index 8df74629dc55..a454e3e573cf 100644
--- a/Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml
+++ b/Documentation/devicetree/bindings/phy/ti,omap-usb2.yaml
@@ -50,6 +50,11 @@ properties:
       (deprecated) phandle of the control module used by PHY driver
       to power on the PHY. Use syscon-phy-power instead.
 
+  ti,disable-charger-det:
+    description:
+      if present, driver will disable charger detection logic.
+    type: boolean
+
 required:
   - compatible
   - reg
-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

[PATCH v3 3/3] phy: omap-usb2-phy: disable PHY charger detect

[Roger Quadros]

AM654x PG1.0 has a silicon bug that D+ is pulled high after POR, which
could cause enumeration failure with some USB hubs.  Disabling the
USB2_PHY Charger Detect function will put D+ into the normal state.

Using property "ti,disable-charger-det" in the DT usb2-phy node to
enable this workaround for AM654x PG1.0.

This addresses Silicon Errata:
i2075 - "USB2PHY: USB2PHY Charger Detect is Enabled by Default Without VBUS
Presence"

Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/phy/ti/phy-omap-usb2.c | 35 +++++++++++++++++++++++++++-------
 1 file changed, 28 insertions(+), 7 deletions(-)

diff --git a/drivers/phy/ti/phy-omap-usb2.c b/drivers/phy/ti/phy-omap-usb2.c
index cb2dd3230fa7..21c3904d4efc 100644
--- a/drivers/phy/ti/phy-omap-usb2.c
+++ b/drivers/phy/ti/phy-omap-usb2.c
@@ -26,6 +26,10 @@
 #define USB2PHY_ANA_CONFIG1		0x4c
 #define USB2PHY_DISCON_BYP_LATCH	BIT(31)
 
+#define USB2PHY_CHRG_DET			0x14
+#define USB2PHY_CHRG_DET_USE_CHG_DET_REG	BIT(29)
+#define USB2PHY_CHRG_DET_DIS_CHG_DET		BIT(28)
+
 /* SoC Specific USB2_OTG register definitions */
 #define AM654_USB2_OTG_PD		BIT(8)
 #define AM654_USB2_VBUS_DET_EN		BIT(5)
@@ -43,6 +47,7 @@
 #define OMAP_USB2_HAS_START_SRP			BIT(0)
 #define OMAP_USB2_HAS_SET_VBUS			BIT(1)
 #define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT	BIT(2)
+#define OMAP_USB2_DISABLE_CHRG_DET		BIT(3)
 
 struct omap_usb {
 	struct usb_phy		phy;
@@ -236,6 +241,13 @@ static int omap_usb_init(struct phy *x)
 		omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
 	}
 
+	if (phy->flags & OMAP_USB2_DISABLE_CHRG_DET) {
+		val = omap_usb_readl(phy->phy_base, USB2PHY_CHRG_DET);
+		val |= USB2PHY_CHRG_DET_USE_CHG_DET_REG |
+		       USB2PHY_CHRG_DET_DIS_CHG_DET;
+		omap_usb_writel(phy->phy_base, USB2PHY_CHRG_DET, val);
+	}
+
 	return 0;
 }
 
@@ -366,14 +378,12 @@ static int omap_usb2_probe(struct platform_device *pdev)
 	phy->mask		= phy_data->mask;
 	phy->power_on		= phy_data->power_on;
 	phy->power_off		= phy_data->power_off;
+	phy->flags		= phy_data->flags;
 
-	if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
-		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-		phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
-		if (IS_ERR(phy->phy_base))
-			return PTR_ERR(phy->phy_base);
-		phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
-	}
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(phy->phy_base))
+		return PTR_ERR(phy->phy_base);
 
 	phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
 							"syscon-phy-power");
@@ -405,6 +415,17 @@ static int omap_usb2_probe(struct platform_device *pdev)
 		}
 	}
 
+	/*
+	 * Errata i2075: USB2PHY: USB2PHY Charger Detect is Enabled by
+	 * Default Without VBUS Presence.
+	 *
+	 * AM654x SR1.0 has a silicon bug due to which D+ is pulled high after
+	 * POR, which could cause enumeration failure with some USB hubs.
+	 * Disabling the USB2_PHY Charger Detect function will put D+
+	 * into the normal state.
+	 */
+	if (of_property_read_bool(node, "ti,disable-charger-det"))
+		phy->flags |= OMAP_USB2_DISABLE_CHRG_DET;
 
 	phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 	if (IS_ERR(phy->wkupclk)) {
-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki