Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Sun, 14 Aug 2022 15:01:04 -0600
From:   Rob Herring <robh@kernel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc:     Bjorn Andersson <bjorn.andersson@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        linux-usb@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        Prashant Malani <pmalani@chromium.org>,
        Stephen Boyd <swboyd@chromium.org>,
        Pin-yen Lin <treapking@chromium.org>
Subject: Re: [PATCH 1/2] dt-bindings: usb: Introduce GPIO-based SBU mux
Message-ID: <20220814210104.GA690892-robh@kernel.org>
References: <20220810204750.3672362-1-bjorn.andersson@linaro.org>
 <20220810204750.3672362-2-bjorn.andersson@linaro.org>
 <a13bce60-25b4-d075-d56a-d1283e91e3ba@linaro.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <a13bce60-25b4-d075-d56a-d1283e91e3ba@linaro.org>
Precedence: bulk

On Thu, Aug 11, 2022 at 12:14:48PM +0300, Krzysztof Kozlowski wrote:
> On 10/08/2022 23:47, Bjorn Andersson wrote:
> > Introduce a binding for GPIO-based mux hardware used for connecting,
> > disconnecting and switching orientation of the SBU lines in USB Type-C
> > applications.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> > ---
> >  .../devicetree/bindings/usb/gpio-sbu-mux.yaml | 77 +++++++++++++++++++
> >  1 file changed, 77 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/usb/gpio-sbu-mux.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/gpio-sbu-mux.yaml b/Documentation/devicetree/bindings/usb/gpio-sbu-mux.yaml
> > new file mode 100644
> > index 000000000000..7d8aca40c7ca
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/usb/gpio-sbu-mux.yaml
> > @@ -0,0 +1,77 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: "http://devicetree.org/schemas/usb/gpio-sbu-mux.yaml#"
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> > +
> > +title: GPIO-based SBU mux
> > +
> > +maintainers:
> > +  - Bjorn Andersson <bjorn.andersson@linaro.org>
> > +
> > +description:
> > +  In USB Type-C applications the SBU lines needs to be connected, disconnected
> > +  and swapped depending on the altmode and orientation. This binding describes
> > +  a family of hardware which perform this based on GPIO controls.
> 
> +Cc few folks.
> 
> This looks familiar to:
> 
> https://lore.kernel.org/linux-devicetree/eaf2fda8-0cd6-b518-10cb-4e21b5f8c909@linaro.org/T/#m39254b7f8970b3e1264f9d1a979557bb46ab162c
> 
> Rob and Stephen had several concerns about that approach.

My overall concern is a bunch of one-off bindings with no one thinking 
about a variety of USB-C h/w. I need h/w diagrams and corresponding 
bindings. The key part being more than 1. I'm not all that familiar with 
the former to help on the bindings.

Rob