diff mbox series

[v2,1/2] dt-bindings: usb: Introduce ITE IT5205 Alt. Mode Passive MUX

Message ID 20240119125812.239197-2-angelogioacchino.delregno@collabora.com
State Accepted
Commit cde644ae1967d4fcb0fb27b47709654fd24208ae
Headers show
Series [v2,1/2] dt-bindings: usb: Introduce ITE IT5205 Alt. Mode Passive MUX | expand

Commit Message

AngeloGioacchino Del Regno Jan. 19, 2024, 12:58 p.m. UTC 
Introduce a binding for the ITE IT5205 Alternate Mode Passive MUX,
used for connecting, disconnecting and switching orientation and
control the SBU signals for alternate modes on USB Type-C ports.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 .../devicetree/bindings/usb/ite,it5205.yaml   | 72 +++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/ite,it5205.yaml

Comments

Krzysztof Kozlowski Jan. 22, 2024, 9:39 a.m. UTC | #1 
On 19/01/2024 13:58, AngeloGioacchino Del Regno wrote:
> Introduce a binding for the ITE IT5205 Alternate Mode Passive MUX,
> used for connecting, disconnecting and switching orientation and
> control the SBU signals for alternate modes on USB Type-C ports.
> 

...

> +  mode-switch:
> +    description: Flag the port as possible handle of altmode switching
> +    type: boolean
> +
> +  orientation-switch:
> +    description: Flag the port as possible handler of orientation switching
> +    type: boolean

Just FYI, I will be sending v2 of:
https://lore.kernel.org/all/20240115092923.105275-1-krzysztof.kozlowski@linaro.org/

which could be used here. If your patch gets first, I will adjust mine.

...

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    i2c2 {

i2c {



Best regards,
Krzysztof
AngeloGioacchino Del Regno Jan. 22, 2024, 10:27 a.m. UTC | #2 
Il 19/01/24 17:18, Conor Dooley ha scritto:
> On Fri, Jan 19, 2024 at 01:58:11PM +0100, AngeloGioacchino Del Regno wrote:
>> Introduce a binding for the ITE IT5205 Alternate Mode Passive MUX,
>> used for connecting, disconnecting and switching orientation and
>> control the SBU signals for alternate modes on USB Type-C ports.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>> ---
>>   .../devicetree/bindings/usb/ite,it5205.yaml   | 72 +++++++++++++++++++
>>   1 file changed, 72 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/usb/ite,it5205.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/usb/ite,it5205.yaml b/Documentation/devicetree/bindings/usb/ite,it5205.yaml
>> new file mode 100644
>> index 000000000000..36ec4251b5f2
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/usb/ite,it5205.yaml
>> @@ -0,0 +1,72 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/usb/ite,it5205.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: ITE IT5202 Type-C USB Alternate Mode Passive MUX
>> +
>> +maintainers:
>> +  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>> +  - Tianping Fang <tianping.fang@mediatek.com>
>> +
>> +properties:
>> +  compatible:
>> +    const: ite,it5205
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  vcc-supply:
>> +    description: Power supply for VCC pin (3.3V)
>> +
>> +  mode-switch:
>> +    description: Flag the port as possible handle of altmode switching
>> +    type: boolean
>> +
>> +  orientation-switch:
>> +    description: Flag the port as possible handler of orientation switching
>> +    type: boolean
>> +
>> +  ite,ovp-enable:
>> +    description: Enable Over Voltage Protection functionality
>> +    type: boolean
> 
> Bitta devil's advocacy perhaps, but why is this DT property? Is it not
> known whether or not this is supported based on the compatible, and
> whether or not to enable it is a decision for the operating system to
> make?
> 
> 

AFAIK, not all board designs can use the OVP. On some, this may be unstable - the
use case where this can be safely enabled is when there's nothing in between the
mux and the controller, and between the mux and the port.

Cheers,
Angelo
AngeloGioacchino Del Regno Jan. 23, 2024, 11:52 a.m. UTC | #3 
Il 22/01/24 19:06, Conor Dooley ha scritto:
> On Mon, Jan 22, 2024 at 11:27:11AM +0100, AngeloGioacchino Del Regno wrote:
>> Il 19/01/24 17:18, Conor Dooley ha scritto:
>>> On Fri, Jan 19, 2024 at 01:58:11PM +0100, AngeloGioacchino Del Regno wrote:
>>>> Introduce a binding for the ITE IT5205 Alternate Mode Passive MUX,
>>>> used for connecting, disconnecting and switching orientation and
>>>> control the SBU signals for alternate modes on USB Type-C ports.
>>>>
>>>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>>>> ---
>>>>    .../devicetree/bindings/usb/ite,it5205.yaml   | 72 +++++++++++++++++++
>>>>    1 file changed, 72 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/usb/ite,it5205.yaml
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/usb/ite,it5205.yaml b/Documentation/devicetree/bindings/usb/ite,it5205.yaml
>>>> new file mode 100644
>>>> index 000000000000..36ec4251b5f2
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/usb/ite,it5205.yaml
>>>> @@ -0,0 +1,72 @@
>>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/usb/ite,it5205.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: ITE IT5202 Type-C USB Alternate Mode Passive MUX
>>>> +
>>>> +maintainers:
>>>> +  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>>>> +  - Tianping Fang <tianping.fang@mediatek.com>
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    const: ite,it5205
>>>> +
>>>> +  reg:
>>>> +    maxItems: 1
>>>> +
>>>> +  vcc-supply:
>>>> +    description: Power supply for VCC pin (3.3V)
>>>> +
>>>> +  mode-switch:
>>>> +    description: Flag the port as possible handle of altmode switching
>>>> +    type: boolean
>>>> +
>>>> +  orientation-switch:
>>>> +    description: Flag the port as possible handler of orientation switching
>>>> +    type: boolean
>>>> +
>>>> +  ite,ovp-enable:
>>>> +    description: Enable Over Voltage Protection functionality
>>>> +    type: boolean
>>>
>>> Bitta devil's advocacy perhaps, but why is this DT property? Is it not
>>> known whether or not this is supported based on the compatible, and
>>> whether or not to enable it is a decision for the operating system to
>>> make?
>>>
>>>
>>
>> AFAIK, not all board designs can use the OVP. On some, this may be unstable - the
>> use case where this can be safely enabled is when there's nothing in between the
>> mux and the controller, and between the mux and the port.
> 
> Okay, if it varies based on the configuration that makes sense. Perhaps
> in the future consider mentioning stuff like that in the commit message.
> 
> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> 

You're right, it's totally sensible to write that in the commit message,
will do next time.

P.S.: I have been too much impatient and already sent a v3 because I had to
fix an issue with the code, could you please give your R-b to the v3 as well?
There's no change in the bindings commit.

https://lore.kernel.org/r/20240122110446.140226-2-angelogioacchino.delregno@collabora.com

Thanks again,
Angelo
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/usb/ite,it5205.yaml b/Documentation/devicetree/bindings/usb/ite,it5205.yaml
new file mode 100644
index 000000000000..36ec4251b5f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/ite,it5205.yaml
@@ -0,0 +1,72 @@ 
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/ite,it5205.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ITE IT5202 Type-C USB Alternate Mode Passive MUX
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
+  - Tianping Fang <tianping.fang@mediatek.com>
+
+properties:
+  compatible:
+    const: ite,it5205
+
+  reg:
+    maxItems: 1
+
+  vcc-supply:
+    description: Power supply for VCC pin (3.3V)
+
+  mode-switch:
+    description: Flag the port as possible handle of altmode switching
+    type: boolean
+
+  orientation-switch:
+    description: Flag the port as possible handler of orientation switching
+    type: boolean
+
+  ite,ovp-enable:
+    description: Enable Over Voltage Protection functionality
+    type: boolean
+
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+    description:
+      A port node to link the IT5205 to a TypeC controller for the purpose of
+      handling altmode muxing and orientation switching.
+
+required:
+  - compatible
+  - reg
+  - orientation-switch
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c2 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        typec-mux@48 {
+          compatible = "ite,it5205";
+          reg = <0x48>;
+
+          mode-switch;
+          orientation-switch;
+
+          vcc-supply = <&mt6359_vibr_ldo_reg>;
+
+          port {
+            it5205_usbss_sbu: endpoint {
+              remote-endpoint = <&typec_controller>;
+            };
+          };
+        };
+    };
+...