linux-kernel - Re: [PATCH v2 1/2] dt-bindings: usb: Introduce ITE IT5205 Alt. Mode Passive MUX

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Message-ID: <20240122-delouse-popsicle-a6f94cce9fb4@spud>
Date: Mon, 22 Jan 2024 18:06:15 +0000
From: Conor Dooley <conor@...nel.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: gregkh@...uxfoundation.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	heikki.krogerus@...ux.intel.com, matthias.bgg@...il.com,
	dmitry.baryshkov@...aro.org, neil.armstrong@...aro.org,
	andersson@...nel.org, nathan@...nel.org, luca.weiss@...rphone.com,
	tianping.fang@...iatek.com, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v2 1/2] dt-bindings: usb: Introduce ITE IT5205 Alt. Mode
 Passive MUX

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@...labora.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@...labora.com>
> > > +  - Tianping Fang <tianping.fang@...iatek.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@...rochip.com>

Thanks,
Conor.

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