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Subject: Re: [PATCH v2] usb: typec: get the vbus source and charge values from
 the devicetree
To:     "Angus Ainslie (Purism)" <angus@akkea.ca>,
        Guenter Roeck <linux@roeck-us.net>
Cc:     Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-usb@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20180906192644.24587-1-angus@akkea.ca>
 <20180909180531.28092-1-angus@akkea.ca>
From:   Guenter Roeck <guenter@roeck-us.net>
Message-ID: <3f2ae49a-9029-3f75-fb2d-abebc537594a@roeck-us.net>
Date:   Sun, 9 Sep 2018 12:52:04 -0700
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On 09/09/2018 11:05 AM, Angus Ainslie (Purism) wrote:
> If the board is being powered by USB disabling the source and sink
> can remove power from the board. Allow the source and sink to be
> initallized based on devicetree values.
>
> Changed since V1:
>
> use devicetree values instead of hardcoded initialization.
>
> Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>
> ---
>   .../bindings/connector/usb-connector.txt           |  4 ++++
>   drivers/usb/typec/tcpm.c                           | 14 +++++++++++---
>   2 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/connector/usb-connector.txt b/Documentation/devicetree/bindings/connector/usb-connector.txt
> index 8855bfcfd778..afe851a713c3 100644
> --- a/Documentation/devicetree/bindings/connector/usb-connector.txt
> +++ b/Documentation/devicetree/bindings/connector/usb-connector.txt
> @@ -22,6 +22,10 @@ Optional properties for usb-c-connector:
>     or Try.SRC, should be "sink" for Try.SNK or "source" for Try.SRC.
>   - data-role: should be one of "host", "device", "dual"(DRD) if typec
>     connector supports USB data.
> +- init-vbus-source: set the initalization value for vbus-source to true.
> +  If this property is not present the initial value will be false.
> +- init-vbus-charge: set the initalization value for vbus-charge to true.
> +  If this property is not present the initial value will be false.
>   
This change will require DT maintainer approval.

Thanks,
Guenter

>   Required properties for usb-c-connector with power delivery support:
>   - source-pdos: An array of u32 with each entry providing supported power
> diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
> index ca7bedb46f7f..7f5d4f209e07 100644
> --- a/drivers/usb/typec/tcpm.c
> +++ b/drivers/usb/typec/tcpm.c
> @@ -2462,9 +2462,7 @@ static int tcpm_init_vbus(struct tcpm_port *port)
>   {
>   	int ret;
>   
> -	ret = port->tcpc->set_vbus(port->tcpc, false, false);
> -	port->vbus_source = false;
> -	port->vbus_charge = false;
> +	ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source, port->vbus_charge);
>   	return ret;
>   }
>   
> @@ -4266,6 +4264,16 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
>   		return -EINVAL;
>   	port->port_type = port->typec_caps.type;
>   
> +	if (fwnode_property_present(fwnode, "init-vbus-source"))
> +		port->vbus_source = true;
> +	else
> +		port->vbus_source = false;
> +
> +	if (fwnode_property_present(fwnode, "init-vbus-charge"))
> +	        port->vbus_charge = true;
> +	else
> +	        port->vbus_charge = false;
> +
>   	if (port->port_type == TYPEC_PORT_SNK)
>   		goto sink;
>